Engines

Evolution 26GT2 (1.6) Gas Engine w/o Muffler Ref: EVO26GT2
The 26GT comes equipped with Evolution’s advanced GT2 Ignition System. The GT2 Ignition System can be powered by a Li-Po battery pack without the need for a regulator. It also includes an optional, remotely-mounted LED tach as well as timing software that can be programmed for muffler or tuned pipe exhaust systems.

Features
Easy conventional mounting with existing motor mounts
Easy-to-start electronic ignition
Superior porting
Specially engineered for ease of use
Preset Walbro carburetor
Same no-fuss reliability as Evolution's glow engines
Includes everything needed for installation
Product Specifications
Type:2-stroke Gasoline
Displacement:1.55 cu in (25.50 cc)
Bore:1.30 in (33.00 mm)
Stroke:1.17 in (30.10 mm)
Cylinders:Single
Engine (Only) Weight:936 g (33.6 oz)
Crankshaft Threads:M 10x1mm
Benchmark Prop:18x6 @ 8,700
Prop Range:16x8 - 18x8
RPM Range:1,400 - 9,500
Fuel:Gas/Oil Mix 40:1
Mounting Dimensions:146 x 70 x 99 mm
HP:3.8 Ps @ 9,000 RPM
Cylinder Type:Ring
Carb Type:walbro 2-needle WT481
Crank Type:Ball Bearing
Price: £249.99 (Including VAT at 17.5%)

Evolution 35GT2 (2.15) Gas Engine w/o Muffler Ref: EVO35GT2
The 35GT2 comes equipped with Evolution’s advanced GT2 Ignition System. The GT2 Ignition System can be powered by a Li-Po battery pack without the need for a regulator. It also includes an optional, remotely-mounted LED tach as well as timing software that can be programmed for muffler or tuned pipe
exhaust systems.
Features
Easy conventional mounting with existing motor mounts
Easy-to-start electronic ignition
Superior porting
Specially engineered for ease
Preset Walbro carburetor
Same no-fuss reliability as Evolution's glow engines
Includes everything needed for installation
Product Specifications
Type:2-stroke Gasoline
Displacement:2.15 cu in (34.60 cc)
Bore:1.39 in (35.50 mm)
Stroke:1.38 in (35.20 mm)
Cylinders:Single
Engine (Only) Weight:1493 g (52.8 oz)
Crankshaft Threads:M 10x1mm
Benchmark Prop:19x8 @ 8,200
Prop Range:18x8 - 21x10
RPM Range:1,400 - 9,000
Fuel:Gas/Oil mix 40:1
Mounting Dimensions:182 x 84 x 118 mm
HP:4.1 PS @ 8,500 rpm
Cylinder Type:Ring
Carb Type:Walbro 2-Needle WT561
Crank Type:Ball Bearing
Price: £269.99 (Including VAT at 17.5%)

Saito FG36 Petrol Four Stroke Ref: SaitoFG36
The FG-36 is a new departure for Saito - a 36cc petrol
engine.
This has got to be the ultimate engine for that large warbird or would equally suit a larger 3D model, great performance and economy.
The Saito FG-36 is supplied with a CE approved electronic
ignition system and a purpose made aluminium engine
mount. The carburettor employs a diaphragm pump for
reliable fuel feed in any attitude - even the wildest of 3D
stunts! This also means that it is not sensitive to the
position of the fuel tank, which allows the tank to be
positioned to maximise the CG position. You can use
forecourt quality petrol mixed in a ratio of 20-30:1 petrol
to oil. The FG-36 is very clean running and is very
economical.
Specifiction:
Displacement (cc) 36.3
Bore (mm) 38
Stroke (mm) 32
Practical RPM 1,700 - 9,000
Weight (g) 1245 (body only)
Prop (in) 18x8 - 20x8
Shaft (ISO) M8 x 1.25
Power(HP) 3.0

Price: £558.00 (Including VAT at 17.5%)

Evolution 45GX (2.6) Gas Engine w/o Muffler Ref: EVOE45GX
With its lightweight magnesium crankcase and advanced porting, the 45GX2 offers the highest power-to-weight ratio in the Evolution® Gas lineup. Aimed directly at the very popular 50cc class of models, the Evolution 45GX2 will provide that vertical thrust you crave for 25% to 30% scale aerobatic planes like Hangar 9’s 27% Extra 260 ARF.
Features
Specifically designed for 50cc 27% scale models
Easy-to-start electronic ignition
Superior Porting
Specially engineered for no-fuss flying
Preset Walbro carburetor
Same no-fuss reliability as Evolution's glow engines
Includes everything needed for installation
Product Specifications
Type:2 - Stroke
Displacement:2.60 cu in (43.00 cc)
Bore:1.49 in (38.00 mm)
Stroke:1.49 in (38.00 mm)
Cylinders:Single
Engine (Only) Weight:1290 grams (45.53 oz)
Crankshaft Threads:M10 x 1 mm
Benchmark Prop:23"x8" Mejzlik @ 6100 rpm
Prop Range:22"x8" thru 24"x10"
RPM Range:1,000 - 7,500 rpm
Fuel:Gas/Oil mix 40:1
Muffler Type:Can
HP:5.2 PS /6,200 rpm
Cylinder Type:Ring
Starting System:Electronic Ignition
Carb Type:Walbro
Crank Type:Ball Bearing
Price: £399.99 (Including VAT at 17.5%)

Evolution 58GX (3.6) Gas Engine w/o Muffler Ref: EVOE58GX
Features
Easy-to-start electronic ignition
Superior porting for high power
Specially engineered for ease of operation
Preset Walbro carburetor
Same no-fuss reliability as Evolution's glow engines
Includes everything needed for installation
Product Specifications
Carb Type:
Type:2-stroke Gasoline
Displacement:3.60 cu in (58.19 cc)
Bore:1.65 in (42.00 mm)
Stroke:1.65 in (42.00 mm)
Cylinders:Single
Engine (Only) Weight:1820 g (64.2 oz)
Crankshaft Threads:M10 X 1.0 mm
Benchmark Prop:Mejzlik 24 x 10 @ 6,900
Prop Range:22 x 10 - 26 x 10
RPM Range:1,000 - 7,500
Fuel:Gas/Oil mix 40:1
Mounting Dimensions:243 x 78 x 140 mm
HP:8.5 hp @ 6950 rpm
Cylinder Type:Ring
Starting System:Electronic Ignition
Carb Type:Walbrox
Crank Type:Ball Bearing
Carb Type:Walbro
Price: £424.99 (Including VAT at 17.5%)

Evolution 116GX2 (7.2) Gas Engine w/o Muffler Ref: EVOE116GX2
The 116GX2’s innovative CON-JET(tm) induction system actually adjusts the mixture as the throttle is opened and closed. Mixture is leaned with the throttle body in the low RPM position for super-smooth idle performance. As the throttle is advanced, CON-JET richens the mixture to give the 116GX superior acceleration into the upper power range. Also part of the CON-JET system is a dual-channel intake manifold that guarantees both cylinders get the exact same fuel/air ratio from the big-barrel Walbro carb. The result is optimum power production and uniform cylinder temps flight after flight.If you’re looking for unlimited power potential for giant IMAC machines or huge scale replicas, nothing else comes close.
Features
Same no-fuss reliability as Evolution’s glow engines
Power to fly 36%–40% 3D models
Easy-to-start electronic ignition system
Superior porting
Exclusive CON-JET™ induction system
Factory-set Walbro carburetor for quick first starts
Ball bearing-supported crankshaft
Product Specifications
Type:2-Stroke Gasoline
Displacement:7.2 cu in (116 cc)
Bore:42mm (1.65 in)
Stroke:42mm (1.65 in)
Cylinders:Twin
Total Weight:3360 grams w/IGNITION
Engine (Only) Weight:3090 grams (109.07 oz
Crankshaft Threads:M10 X 1 mm
Benchmark Prop:Mejzlik 30x10" @ 6100 rpm
Prop Range:28 x 10-14, 30x10-12, 32x10
RPM Range:1000 - 6300 rpm
Fuel:Gasoline w/oil mix 1:40
Mounting Dimensions:283mm x 278mm x 120mm
Muffler Type:EVO30104210e
Cylinder Type:Ring
Carb Type:Walbro (EVO30103314B) Boxer
Price: £874.99 (Including VAT at 17.5%)

O.S. MAX 15CV-A w/871 Silencer Ref: l-os11620
High performance from the smallest physical size is the name of the game as far as the Max 15CV-A is concerned. Its twin ball-raced crankshaft, full Schnuerle porting and large bore carburettor all contribute to the 0.5bhp power output. A great engine for 1/12th scale combat or those who just like the best, regardless of size.
Specifications
Displacement 2.49cc 0.152cu. In.
Bore 15.2mm 0.598in.
Stroke 13.7mm 0.539cu. in.
Power Output 0.5 / 18000 (BHP/RPM)
RPM 2500 - 19000
Weight 170g
Price: £62.99 (Including VAT at 17.5%)

O.S. MAX 15LA Silv. w/871 Silencer Ref: l-os11532
O.S. MAX 15LA Silv. w/871 Silencer

Price: £40.49 (Including VAT at 17.5%)

O.S. MAX 25LA Silv. w/E-2030 Sil. Ref: l-os12352
Like its larger brothers the 25LA replaced its FP predecessor and offers the kind of reliable performance you would expect from O.S. with all the design advantages of the latest LA series. The ‘safety’ rear needle valve assembly, extended crankshaft and that unique shape is guaranteed to impress even the most conservative of tastes.
Specification
Weight: 197g (6.95oz) Displacement: 4.07cc (0.25cu.in.)
Bore: 18.0mm (0.709in.)
Stroke: 16.0mm (0.630in.)
Power Output: 0.6PS@15000RPM
Practical RPM: 2000~16000RPM
Price: £44.98 (Including VAT at 17.5%)

O.S. MAX 25FX w/892 Silencer Ref: l-os12660
A high performance side exhaust engine that is suitable for many types of small R/C aircraft such as sport, scale and aerobatic. And with greater performance, durability & easier, safer handling than its predecessor, the 25SF, rear mounted needle it features a twin ballraced crank & comes complete with an 892 silencer, the 25FX is designed to be used with 9” x 5” propellers.
Specifications
Displacement 4.07cc 0.248cu. In.
Bore 18.0mm 0.708in.
Stroke 16.0mm 0.630cu. in.
Power Output 0.84/ 18000 (BHP/RPM)
RPM 2500 - 19000
Weight 248g
Price: £58.49 (Including VAT at 17.5%)

OS-25LA 2 Stroke Ref: L-OS12350
Like its larger brothers the new 25LA replaces its FP predecessor and offers the kind of reliable performance you would expect from O.S. with all the design advantages of the latest LA series.
The 'safety' rear needle valve assembly, extended crankshaft and that unique blue finish guaranteed to impress even the most conservative of tastes.
Specifications
Displacement 4.07cc 0.249cu in.
Bore 18.0mm 0.709in.
Stroke 16.0mm 0.630cu. in.
Power Output 0.6 / 15000 (BHP/RPM)
RPM 2000 - 16000
Weight 197g
Price: £44.99 (Including VAT at 17.5%)

Super Custom .25 Ref: 4480140
SC engines are excellent value and very easy to set up, and the SC25 is ideal for smaller aero applications.
Specification as follows:
C.C. - 4.04
Bore - 17.40
Stroke - 17.00
Power (kW) - 0.74/16,500
R.P.M. - 2500-1200
Weight - 297g
Piston - ABC
Price: £37.79 (Including VAT at 17.5%)

O.S. FS30 Surpass w/F-1020 Silencer Ref: l-os33000
The smallest in the O.S. four stroke range and, at only 9.56 oz, it's also the world's lightest production model four stroke.
It has most of the features of the larger single cylinder O.S. four strokes, but it has its camshaft carried in bronze bushes - backed up by a pair of spherical thrust bearings.
Ideal for trainers, scale & sport models. Designed to be used with 9” x 6~7” to 10” x 6” props.
Specification
Weight: 279g
Displacement: 4.89cc 0.299cu. In.
Bore: 19.5mm 0.767in.
Stroke: 16.4mm 0.648in
Practical RPM: 2500-13000
Price: £103.99 (Including VAT at 17.5%)

OS-32SXH Heli 2 Stroke Ref: L-OS12986
Designed for .30 class sport and scale helicopters, the 32SX-H Ring has an identical specification to the 32SX-H, but uses a ringed piston/liner assembly to give a lower compression on start-up without sacrificing top end power and performance.
Shown here the powerful 32SX-H with optional drive washer.
Specification
Weight: 285g (ring) 10.05 oz
Displacement: 5.23cc 0.32cu in.
Bore: 19.5mm 0.768in.
Stroke: 17.5mm 0.689in
Power Output: 1.2PS@18000 RPM
Practical RPM: 2000-22000
Price: £82.00 (Including VAT at 17.5%)

O.S. MAX 32SX-HX Ring Ref: L-OS12987
Although basically identical to the standard 32SX-H Ring, the 32SX-HX is equipped with a handy and durable pull-start system.
No more lugging about of heavy 12V batteries and starters with this engine. All you need is fuel and a glowstart and you're ready to fly.
The 32SX-HX will not fit in some helicopters so please check compatibility with your dealer.
Specification
Weight: 387g 13.66 oz
Displacement: 5.23cc 0.319cu in.
Bore: 19.5mm 0.768in.
Stroke: 17.5mm 0.689in
Power Output: 1.15PS@18000 RPM
Practical RPM: 2000-21000
Price: £143.98 (Including VAT at 17.5%)

O.S. MAX 35AX w/E-3080 Silencer Ref: L-OS13100
Designed specifically for light weight and high power output from a compact crankcase, the Max 35AX is an ideal engine for 'Fun Fly' and 3D flying.
The new crankcase follows the theme of all the new AX range and the 35AX will fit exactly where the old 32SX did without modification.
The new E-3080 muffler is highly effective and features a sealing O-ring between the two main sections. As you would expect, the silencer outlet can be rotated to and desired position.
With only 10g more than the old Max 32SX, the 35AX has very little weight penalty for it's substantial power increase.
Specification
Displacement 5.77cc(0.35cu.in)
Output 1.3ps/16,000r.p.m.
Bore 20.2mm(0.793in.)
Practical r.p.m.Range 2,500-17,000r.p.m.
Stroke 18.0mm(0.709in.)
Weight 280g(9.89oz.)
Price: £99.99 (Including VAT at 17.5%)

Super Custom .36 Ref: 4480190
Another of the SC collection of aero engines available.
Specification as follows:
C.C. - 5.90
Bore - 20.20
Stroke - 18.40
Power (kW) - 0.95/17,500
R.P.M. - 2000-1200
Weight - 327g
Piston - ABC
Price: £51.29 (Including VAT at 17.5%)

OS-37SZH Heli 2 Stroke Ref: L-OS14000
Following on from the concept developed in the 70SZ-H, the latest 37SZ-H brings a new level of performance to '30-class' helicopters.
Just about everything has been changed compared to the 32SX-H in the pursuit of power and control. That super-rigid crankcase contains a highly developed, ringed piston/liner set and optimised crankshaft for the right combination of power and smoothness. The new carburettor has been purpose designed for precision control and is capable of being operated by push-pull linkages if required.
Specification
Weight: 293g 10.33 oz
Displacement: 6.07cc 0.37cu in.
Bore: 20.5mm 0.807in.
Stroke: 18.4mm 0.724in
Power Output: 1.4PS@18000 RPM
Practical RPM: 2000-21000
Price: £90.01 (Including VAT at 17.5%)

Irvine 39 ABC R/C Ref: L-IRV4391
Whilst the choice of 39 as a capacity might seem strange at first glance, there is in fact a logical reason for it. The 39 was born out of the need to get the maximum power from the smallest possible crankcase. It is in fact very similar in size to a 25. Trying to fit the 39 in a mount designed for a 40 would be somewhat tricky. Keeping the capacity as a 30 class engine is more inline with its intended purpose.
This engine is particularly suited to the rigours of 3D Fun Fly competition flying, where the limitations of model size and engine capacity are controlling factors. It is no coincidence that most of the competitors in Fun Fly at the Nationals choose the Irvine 39 as their powerplant. These pilots demand power, torque and throttle response and the 39 delivers this in style.
From the precision cast crankcase, through the true ABC piston liner to the CNC machined, Jetsream carburettor, the Irvine 39 shouts quality.
Try one in your Fun Fly and you will see what we mean.
Specification
Weight: 300g
Displacement: 6.35cc
Bore: 21.20mm
Stroke: 18.0mm
Power Output: 1.3PS@17,000
Practical RPM: 3,000-19,000
Price: £71.99 (Including VAT at 17.5%)

O.S. MAX 40LA w/E-3030 Silencer Ref: l-os13380
Originally designed for medium sized trainers and sports models, the O.S. MAX-40LA was the first engine in the LA series to be launched, and to commemorate O.S.'s 60th anniversary.
The engine features a remote needle valve and distinctive rich blue finish.
Designed to be used with 10” x 6~7” to 11” x 6” propellers. It still leads the class today.
Specifications
Displacement 6.49cc 0.396cu. In.
Bore 21.2mm 0.835in.
Stroke 18.4mm 0.724cu. in.
Power Output 1.0 / 15000 (BHP/RPM)
RPM 2000 - 16000
Weight 269g
Specification
Weight: 269g
Practical RPM: 2000 - 16000
Price: £44.99 (Including VAT at 17.5%)

Super Custom .40 Rear Needle Ref: 4480205
The SC 40 is an ideal power plant for the average size trainer and again is a low cost engine that is extremely reliable.
Specification as follows:
C.C. 6.46
Bore - 20.66
Stroke - 19.28
R.P.M. - 2000-12500
Weight - 430g
Piston - ABC
Price: £40.49 (Including VAT at 17.5%)

Irvine 40 MKIV Ref: L-IRV5401
These engines are simply stunning and are great powerplants whatever your application.
Specification
Weight: 403g
Displacement: 6.47cc
Bore: 20.5mm
Stroke: 19.6mm
Power Output: 1.4PS@16,000
Practical RPM: 2,000-17,000
Price: £51.99 (Including VAT at 17.5%)

O.S. FS40 Surpass w/FS40S Silencer Ref: l-os35220
The original 6.5cc FS-40 was O.S.'s second production single cylinder four stroke and the first to have the front mounted helical driven camshaft now common to all their single cylinder O.S. four stroke engines.
The current FS-40S is an all-new design which is much more powerful and closely related to the FS-48, though smaller both internally and externally.
Supplied complete with silencer, the FS-40S is ideal for sport and scale models and is designed for use with 10” x 7.5” to 12” x 6” propellers.
Specification
Weight: 600g
Displacement: 9.95cc 0.602cu. In.
Bore: 24.0mm 0.945in.
Stroke: 22.0mm 0.866in
Power Output: 2.2/16000 (BHP/RPM)
Practical RPM: 2200-12000
Price: £117.98 (Including VAT at 17.5%)

Irvine 46 ABC R/C MkIV Ref: L-IRV5461
Sharing the same external dimensions as its 40 size stable mate, the all new Irvine 46 MkIV delivers greater power for not a lot more cost.
Inside there is the very latest in ringless piston and liner technology, which is the result of many hours of computer design and extensive flight testing. The attention to detail lavished in the manufacturing processs ensures that you get the very best combination of power and engine life.
Irvine has buit its reputation on providing good quality, high performance engines that are just that bit different from the rest.
The completely new C40H carburettor moves the benchmark on from the reliable Jetstream designs and offers better mid range response without sacrificing top end power. Its substantially lighter as well.
The new Irvine 46 MkIV is again set to be one of the most popular sports engines in the UK.
Specification
Weight: 390g
Displacement: 7.45cc
Bore: 22.0mm
Stroke: 19.6mm
Power Output: 1.65PS@16,000
Practical RPM: 2,000-17,000
Price: £56.99 (Including VAT at 17.5%)

Super Custom .46A Rear Needle Ref: 4480245
A great little engine and a crazy low price!
C.C. - 7.50
Bore - 22.25
Stroke - 19.28
Power (kW) - 1.18/16,500
R.P.M. - 2000-12800
Weight - 443g
Rec Prop - 11 x 7
Price: £44.99 (Including VAT at 17.5%)

O.S. MAX 46LA Silv. w/E-3030 Sil Ref: l-os13393
Physically identical to the popular 40LA but with a 20% increase in power and no discernible increase in weight. If you've built a model that's ended up a little on the heavy side for a 40LA then the 46LA could be the answer to your prayers! Like all engines in the LA range the 46LA comes with an A3 glowplug as standard plus the highly effective E-3030 Silencer.
Specification
Weight: 272g (9.59oz)
Displacement: 7.64cc (0.46cu.in.)
Bore: 23.0mm (0.910in.)
Stroke: 18.4mm (0.724in.)
Power Output: 1.25PS@15000RPM
Practical RPM: 2000~16000RPM
Price: £49.49 (Including VAT at 17.5%)

O.S. MAX 46AX w/E-3010 Silencer Ref: l-os15480
The first engine in the new AX series draws on years of experience in providing the best engines money can buy. The new 46AX now features a new rear-mounted needle valve system that tolerates crash damage better.
The new carburettor has been refined further to make adjustments more precise and throttling even more progressive.
The amazing new 'P-Box' silencer is both distinctive in styling as well as being functional. It improves power and keeps sound levels to a 'purr'. Inside, the 'ringless' piston/liner system delivers strong power and improved life.
Specification
Weight: 375g 13.23oz
Displacement: 7.45cc 0.46cu in.
Bore: 22.0mm 0.866in.
Stroke: 19.6mm 0.772in
Power Output: 1.65PS@16000 RPM
Practical RPM: 2000-17000
Price: £71.99 (Including VAT at 17.5%)

O.S. Rotary 49-PI Type II w/Sil. Ref: l-os31620
Since the introduction of the original OS rotary engine in 1970, the design has stood the test of time and in this latest version, has been brought fully up to date. Just about every aspect has been upgraded in the new Type II version, both internally and externally. It is the area of carburation that has seen the most dramatic change, in the form of a specifically designed, twin-needle version complete with a velocity-stack. All the upgrades are intended to improve the ease of use and the durability of the engine. Many take advantage of the latest metallurgy to do so.
Specification
Weight: 421g (14.82oz)
Displacement: 4.97cc (0.30cu.in)
Power Output: 1.1PS@17000 RPM
Practical RPM: 2500~18000 RPM
Price: £247.49 (Including VAT at 17.5%)

OS-50SX 2 Stroke Ref: L-OS15600
One of the later additions to the 'FX' series, the 61FX offers high levels of performance and durability, plus easy handling qualities and a competitive price for serious sport and aerobatic flyers.
It features a rear mounted needle, O.S. ringless piston/liner and a large fin area for improved cooling. Ideal for scale, sport and aerobatic models, the 61FX is designed to be used with 12” x 7~8” to 12.5” x 6~7” props.
Specifications
Displacement 8.17cc 0.499cu. in.
Bore 22.0mm 0.866in.
Stroke 21.5mm 0.847cu. in.
Power Output 1.8 / 17000 (BHP/RPM)
RPM 2000 - 20000
Weight 390g
Price: £128.00 (Including VAT at 17.5%)

OS-50SXH Heli 2 Stroke Ref: L-OS15500
The class leader in the mid-range helicopter market has grown to be a '50'. This fabulous engine draws on O.S's extensive, World Championship winning experience to produce a stunning 1.8bhp at 17,000rpm. That translates into one of the highest power output in the class and a wide spread of useable torque to match. Its dedicated and highly developed carburettor is supplied with a 'push-pull' arm as standard and provides the precision of carburation that other manufacturers aspire to.
Specification
Weight: 413g
Displacement: 8.17cc 0.499cu. In
Bore: 22.0mm 0.866in.
Stroke: 19.6mm 0.772in
Power Output: 1.8/17000 (BHP/RPM)
Practical RPM: 2000-20000
Price: £96.00 (Including VAT at 17.5%)

OS-50SXH Hyper Heli 2 Stroke Ref: L-OS15550
The best '50-class' engine on the market just became amazing with the introduction of the new 50SX-H Hyper.
That CNC machined cylinder head has been developed to give better power and improved cooling at the same time. The new carburettor has also been improved to help extract more power than the standard engine without sacrificing the throttle precision you have come to expect from OS helicopter engines.
This truly is the 'best' engine in the 50-class and is fast becoming the best seller as well. It's an OS, what else would you expect!!
Specification
Weight: 413g
Bore: 22.0mm 0.866in.
Stroke: 19.6mm 0.772in
Power Output: 1.8/17000 (BHP/RPM)
Practical RPM: 2000-20000
Price: £110.00 (Including VAT at 17.5%)

Super Custom 52 Four Stroke (ringed) Ref: 4480530
The SC 52 four stroke engine is ideal if you are looking for a replacement for your 40 size 2 stroke engine and are the choice of many scale modellers.
Specification as follows:
C.C. - 8.56
Bore - 23.00
Stroke - 20.60
R.P.M. - 2300-9800
Weight - 455g
Piston - Ring
Price: £80.99 (Including VAT at 17.5%)

RCV 58CD Four Stroke Ref: RCV58CD
The RCV58-CD has been designed to meet the demand from aero modellers who want a quality engine, that is easy to use and is competitively priced. Comparable in power to conventional 52 4-stroke engines (or .40 2-stroke engines), this is the ideal choice for scale, aerobatic, fun and general flying. These engines are now starting to be used for training.
58CD Features
Ultra Compact Design - over 1" shorter than conventional 52 4-stroke engines
Low Noise - Unique Real Engine Sound
Uses Conventional Propellers Sizes
Can be mounted inverted
Low Maintenance
Easy to Tune
2-Year Guarantee
Low Cost Spares
Suitable for modellers of all skill levels
Price: £130.50 (Including VAT at 17.5%)

Irvine 53 2 Stroke Ref: L-IRV5531
The original Irvine 53 was a hard act to follow, but needless to say, the new Irvine 53 ABC MkII is more than up to the task.
The new engine shares the same crankcase dimensions as its predecessors and the new 40 and 46 MkIV stablemates, so you can be sure that fitment is not an issue.
The adoption of the latest ringless piston and liner technology, with a totally new bore to stroke ratio, moves the performance on to a new level. The latest C40H carburettor unleashes that performance with the kind of control that you would expect from an engine that has become one of the best sellers in the UK. Smooth, precise and on tap when you need it.
Add the redesigned twin chamber silencer, with swivel outlet and you have the best power to weight ratio engine in its class together with the fully muffled exhaust note that Irvine has become famous for.
Specification
Weight: 385g
Displacement: 8.65cc
Bore: 23.7mm
Stroke: 19.6mm
Power Output: 1.82PS@17,000
Practical RPM: 2,000-17,000
Price: £61.99 (Including VAT at 17.5%)

O.S. MAX 55AX w/E-3020 Silencer Ref: l-os15610
The latest Max 55AX shares its dramatic and unique styling with the highly successful 120AX and is the third engine released by OS in the AX series. Combining maximum power with razor sharp throttle response in the smallest possible crankcase it has a crafty, angled main needle valve for safety and that dramatically designed ‘Powerbox’ silencer is really effective for noise sensitive fields.
Specification
Weight: 404g (524g w/silencer
Displacement: 8.933CC (0.545 cu.in)
Bore: 23.0mm (0.906in.)
Stroke: 21.5mm
Power Output: 1.75PS @ 16000RPM
Practical RPM: 2000-17000
Price: £80.99 (Including VAT at 17.5%)

O.S. FSa-56 w/F-4040 Silencer Ref: l-os34300
The new FSa-56 from O.S. is the first engine in a completely new series of advanced four strokes. The FS ‘Alpha’ series draws on the experience gained from the Surpass range to develop and refine standards to a new level. The increased capacity compared to the FS-52 Surpass means more power/torque and the new carburettor provides even better throttle control across the entire RPM range! There are innovative features like incorporating the crankcase breather/oil recirculation system into the crankcase to dispense with external nipples and drain tubes as well as a dramatic & futuristic style. An effective and versatile silencer is supplied as standard.
Specification
Capacity: 9.32cc / 0.569 cu.in.
Weight: 419g/14.8oz w/o silencer
Bore: 24.0mm / 0.945in
Stroke: 20.6mm / 0.811in
Power Output: 1.0PS @ 10,000 RPM
Price: £166.49 (Including VAT at 17.5%)

O.S. MAX 61FX w/E-4010 Silencer Ref: l-os17750
One of the later additions to the 'FX' series, the 61FX offers high levels of performance and durability, plus easy handling qualities and a competitive price for serious sport and aerobatic flyers.
It features a rear mounted needle, O.S. ringless piston/liner and a large fin area for improved cooling. Ideal for scale, sport and aerobatic models, the 61FX is designed to be used with 12” x 7~8” to 12.5” x 6~7” props.
Specifications
Displacement 9.95cc 0.67cu. In.
Bore 24.0mm 0.945in.
Stroke 22.0mm 0.866cu. in.
Power Output 1.9 / 16000 (BHP/RPM)
RPM 2000 - 17000
Weight 550g
Price: £107.98 (Including VAT at 17.5%)

Saito FA-62A Four Stroke Ref: SAT62A
Packing 62 cubic inches of power into a .56 size case, Saito engineers have once again come up trumps with an easy power upgrade for most 50 size models. The lightweight FA-62a also suits a wide variety of .40 - .72 models.
Displacement: 10.24cc
Bore: 26.2mm
Stroke: 19mm
Pratical RPM: 2,000 ~ 11,500
Weight: 420g
Prop: 12 x 6in ~ 13 x 6in
Cylinder: AAC
Power: 0.95
Price: £130.50 (Including VAT at 17.5%)

O.S. MAX 65LA Silv.W/E-4010 Sil. Ref: l-os16512
A low-cost engine for beginners and sports models, it is reliable and very easy to handle. In both cases the needle valve is mounted at the rear of the motor, so that it can be adjusted safely and at a distance from the spinning propeller. A true lightweight 60 class engine with a surprisingly high performance.
Specification
Weight: 535g (18.87oz)
Displacement: 10.85cc (0.65cu.in.)
Bore: 24.0mm (0.945in.)
Stroke: 24.0mm (0.945in.)
Power Output: 1.7PS@16000RPM
Practical RPM: 2000~16000RPM
Price: £89.99 (Including VAT at 17.5%)

O.S. MAX 75AX w/E-4020 Silencer Ref: l-os17400
The third engine in the new ‘AX’ range of high performance 2 stroke engines fills a convenient gap between the existing 61FX and 91FX, yet features the radical new style pioneered with the fabulous 55AX. The new 75AX is supplied complete with the latest ‘P-Box’ design silencer for improved noise suppression. By keeping the lower crankcase dimensions the same as the 61FX, you can be sure that it will fit in all models designed for a .61, making a power upgrade very simple. The 75AX features the latest O.S. ringless piston technology with multi-layer cylinder coating and high precision Type 61A carburettor with angled safety needle valve assembly.
Specification
Capacity: 12.29cc / 0.75 cu.in.
Weight: 578g / 20.39oz w/o silencer
Bore: 25.8mm / 1.016in
Stroke: 23.5mm / 0.925in
Power Output: 2.4PS @15,000
Price: £121.48 (Including VAT at 17.5%)

4480285 Super Custom 61A Rear Needle Ref: 4480285
SC61A-S AERO RC ABC (R/NEEDLE)
C.C. - 9.95
Bore - 24.00
Stroke - 22.00
Power (kW) - 1.68/15,000
R.P.M. - 2000-12800
Weight - 674g
Rec Prop - 13 x 6 to 14 x 8
Price: £52.19 (Including VAT at 17.5%)

4480540 Super Custom 70 Four Stroke Ref: 4480540
Great value engines by SC.
Specification as follows:
C.C. - 11.5
Bore - 25.80
Stroke - 22
Power (kW) -
R.P.M. - 2200 - 9200
Weight -
Rec Prop - 13 x 8
Engine Mount Spacing - 40mm
Price: £108.89 (Including VAT at 17.5%)

O.S. FS70 Surpass II w/F-4020 Sil. Ref: l-os34700
Based on the earlier FS 70 Surpass but now incorporating all the features associated with the latest 'black rocker cover' derivatives.
With an awesome power output and a healthy spread of torque, the new FS 70 Surpass II delivers smooth power with crisp throttle response and the kind of low fuel consumption you would expect from a state-of-the-art, four-stroke engine.
It's compact dimensions ensure it's suitability for a wide range of models.
Specification
Weight: 580g
Displacement: 11.5cc 0.702cu in.
Bore: 24.0mm 0.945in.
Stroke: 22.0mm 0.866in
Power Output: 1.1/11000 (BHP/RPM)
Practical RPM: 2000-12000
Price: £157.49 (Including VAT at 17.5%)

O.S. FL-70 w/F-4030 Silencer Ref: l-os34800
Recognising that four-stroke engines should be affordable to all modellers, the new FL-70 delivers strong performance at a budget price. That does not mean that quality has been sacrificed, that's not the OS way!!
The FL-70 has some simplified components like the carburettor and propeller driver, but in actual use you would never know. The FL-70 is the first OS four-stroke to feature an ABC piston/liner assembly and this imparts a unique sound to the engine when running.
Safety is still an important issue for OS and the FL-70 is still equipped with a double lock-nut system to retain the propeller.
Like its FS70 Surpass cousin there's still 1.1PS to play with so power is certainly not an issue.
Specification
Weight: 467g 16.47oz
Displacement: 11.45cc 0.70cu in.
Bore: 27.7mm 1.08in.
Stroke: 19.0mm 0.748in
Power Output: 1.1PS@11000 RPM
Practical RPM: 2300-12000
Price: £116.98 (Including VAT at 17.5%)

O.S. FS70 Ultimate w/F-4020 Sil. Ref: l-os34710
Sometimes 'compromise' is not required and only the best will do. The FS70 Ultimate compromises nothing and is an all-out performance engine designed for use in the most demanding environments.
The sophisticated pumped fuel system delivers exactly the right mixture through its dedicated carburettor no matter what manoeuvres the model is asked to perform. Hovering where precise throttle is required or all-out 3D, it's all the same for the FS70 Ultimate.
The special nature of this engine means many components have been specifically designed for this engine. This is reflected in the amazingly compact external dimensions and low weight.
Specification
Weight: 455g 16.05 oz
Displacement: 11.45cc 0.70cu in.
Bore: 27.7mm 1.09in.
Stroke: 19.0mm 0.748in
Power Output: 1.2PS@11000 RPM
Practical RPM: 2000-15000
Price: £202.49 (Including VAT at 17.5%)

O.S. MAX 70SZ-H Ring Ref: L-OS17000
Developed directly from the feedback received from top FAI and 3D pilots throughout the world, the new Max 70SZ-H Ring produces copious quantities of power across the rev range without sacrificing it's ability to perform precision hovering. There's a new stronger crankcase (with 6-point mounts), a new 3-needle carburettor and a completely new liner/port design to give you the performance you need to beat the world! Particularly suited to the demands of 3D flight.
Specification
Weight: 553.5g
Displacement: 11.5cc 0.702cu .in
Bore: 25.8mm 1.016in.
Stroke: 22.0mm
Power Output: 2.5/16000 (BHP/RPM)
Practical RPM: 2000-18000
Price: £152.99 (Including VAT at 17.5%)

O.S. FSa-81 w/F-5030 Silencer Ref: L-OS34810
The new FSa-81 is a direct replacement for the FS-70 Surpass II, offering greater power and throttle precision in a compact and lightweight design. The crankcase mounting dimensions allow the FSa-81 to slot into the same mount that an FS -70S II would for an instant power upgrade.
Like the FSa-56, the crankcase breather system has now been incorporated inside the engine to negate the need for an external vent and the excess oil that eminates from it. A propeller locknut assembly is of course standard.
The new F-5030 silencer is very effective, thanks to it's internal baffle and carefully matched internal volumes and opassages. The design allows a huge range of outlet positions to accomodate almost every model. Even the distance away from the engine can now be adjusted.
The latest 60RA carburettor now features a 'constant velocity' inlet for improved throttle response and reduced spitting.
Specification
Propeller Range: 13x7-9, 14x6-7
Silencer: F-5030
Weight: 556g 19.63ozs
Displacement: 13.26cc 0.809 cu.in.
Bore: 27.7mm 1.091in.
Stroke: 22.0mm 0.866in.
Power Output: 1.3PS @ 11,000
Practical RPM: 2,200 - 12,000
Price: £202.49 (Including VAT at 17.5%)

RCV 91CD Four Stroke Ref: RCV91CD
The engine still uses RCV's unique rotary valve system - which has only one extra moving component to a 2-stroke and so is easy to maintain. This ultra-compact engine is the same height as a conventional .52 4-stroke engines (or .60 2-strokes) which makes cowling much easier than other 4-strokes
Features:
Low Noise - Unique Real Engine Sound
Uses Conventional Propellers Sizes
Can be mounted inverted
Low Maintenance
Easy to Tune
2-Year Guarantee
Low Cost Spares
Suitable for modellers of all skill levels
Specification:
Manufacture Die Cast
Engine Type 4-stroke - Glow ignition
Displacement 0.91 cu inch 15 cc
Max Power (approx.) 1.5 bhp 1.12 kw
Weight (exc. silencer) 25.2 oz 715 g
Length 4.72 inch 120 mm
Height - centre line axis 3.23 inch 82 mm
Cowling Radius R85
Propeller shaft diameter 5/16" UNF
Practical RPM range @ prop 2,400 - 11,000 rpm
Example prop sizes (2-blade) 13x6, 14x6, 14x7
Recommended Fuel 10% Nitro / 15% Oil including max 6% Castor
Price: £161.10 (Including VAT at 17.5%)

O.S. MAX 91SX-H Ring C-Spec Viper Ref: L-OS19070
Similar to the standard 91SX-H C-Spec but with the added advantage of the stunning new 'Viper' head. Not only does this cylinder head improve power, it also improves cooling and throttle response as well. In some way, this can be attributed to the twin glowplug system.
This has the added benefit of giving a little warning of plug failure in flight as one will still keep the engine going, there will just be a little loss of performance to give you the chance to land safely.
A great engine for F3C competition.
Specification
Weight: 534.3g 18.84 oz
Displacement: 14.95cc 0.91cu in.
Bore: 27.7mm 1.09in.
Stroke: 24.8mm 0.976in
Power Output: 3.1PS@15000 RPM
Practical RPM: 2000-16000
Price: £247.49 (Including VAT at 17.5%)

O.S. MAX 91RZ-H DH Ring Ref: L-OS18510
Designed specifically for scale mechanics, the new 91RZ-H provides all the advantages of its 91SZ-H stablemate in terms of power and controllability but with the convenience of a cast cylinder head to suit scale machines such as the Hirobo range.
Specification
Weight: 623g (21.90oz)
Displacement: 14.95cc (0.91cu.in.)
Bore: 27.70mm (1.090in.)
Stroke: 24.80mm (0.976in.)
Power Output: 3.3PS/15000RPM
Practical RPM: 200-16000RPM
Price: £161.99 (Including VAT at 17.5%)

O.S. MAX 91SZ-H Ring PS-Hyper Ref: L-OS18400
O.S. MAX 91SZ-H Ring PS-Hyper
Price: £180.00 (Including VAT at 17.5%)

O.S. MAX 91SZ-H Ring Ref: L-OS18300
The latest '91' class engine for FAI F3C competition dominated the 2005 World Championships and is likely to set the standard in competition flying over the next few years. This totally new engine has been designed from scratch as a pure helicopter engine, as is evident from the unique 'SZ' crankcase. You can be confident that the development of this engine has been made in conjunction with the world's best pilots so that you get the benefit of their immense experience too.
Specification
Displacement: 14..95cc
Bore: 27.7mm
Stroke: 24.8mm
Power Output: 3.3PS@1500 RPM
Practical RPM: 2000-16000
Price: £157.49 (Including VAT at 17.5%)

OS-91FX 2 Stroke Ref: L-OS19021
Sharing exactly the same mounting pattern as the 61FX, the 91FX offers 47% more power with almost no weight penalty!
Just like all FX series engines the 91FX has the rear needle valve assembly with the addition of a variable fuel inlet location in addition to the adjustable main needle orientation. To ease hand starting a ringed piston setup is emplyed.
Give your model a power boost from this compact powerhouse.
Specification
Weight: 550g 19.40oz
Displacement: 14.95cc 0.91cu in.
Bore: 27.7mm 1.09in.
Stroke: 24.8mm 0.980in
Power Output: 2.8PS@15000 RPM
Practical RPM: 2000-16000
Price: £131.99 (Including VAT at 17.5%)

Super Custom FS91AR Ref: 4480620
SC are extremely good engines both 2 and 4 stroke and at prices like this it is easy to see why lots of aero modellers use only these engines.
Specification as follows:
C.C. - 14.95
Bore - 27.70
Stroke - 24.80
R.P.M. - 2000-10000
Weight - 640g
Piston - Ring
Price: £118.35 (Including VAT at 17.5%)

O.S. FS91 Surpass II-P w/F-4020 Sil Ref: l-os35910
This latest version of the popular FS91 Surpass features a true pressurised fuel system. Similar to the new FS 120S-III the new FS 91-II P has a pump system that is capable of delivering constant fuel via the regulatory carburettor. It is therefore ideally suited to the emerging '90' size aerobatic models. Designed to be used with 11 x 10-11” to 12 x 8” propellers. If you're looking for constant fuel feed at any attitude this is the engine to choose. Supplied with an effective large volume muffler.
Specification
Weight: 650g
Displacement: 14.95cc 0.912cu. In.
Bore: 27.7mm 1.091in.
Stroke: 24.8mm0.976in
Power Output: 1.6/11000 (BHP/RPM)
Practical RPM: 2000-12000
Price: £211.49 (Including VAT at 17.5%)

O.S. FS91 Surpass II w/F-4020 Sil. Ref: l-os35920
Developed from the popular FS 91 Surpass and honed to perfection in this latest model.
Like its 52, 70 and 120 stablemates, the new FS 91 Surpass II features a new carburettor, longer crankshaft, plated camshaft/crankshaft/ ring and assure it's owner of the best performance in it's class coupled to the O.S. legendary quality and long life.
This is a great engine for scale models that specify a 61 size two stroke as that four-stroke sound is particularly suited to this environment.
Specification
Weight: 640g
Displacement: 14.95cc 0.912cu. In.
Bore: 27.7mm 1.091in.
Stroke: 24.8mm 0.976in
Power Output: 1.6/11000 (BHP/RPM)
Practical RPM: 2000-12000
Price: £179.99 (Including VAT at 17.5%)

O.S. FS120 Surpass III w/F-5020 Sil Ref: l-os35540
An updated version of the FS120 MkII now fitted with an integral O.S. Type PG-03 fuel pump and carburettor with built-in fuel regulation to offer the maximum engine reliability
irrespective of the fuel tank's position and model attitude.
The FS-120 MkIII features four ball bearings and a special propeller locknut assembly as standard.
Ideal for aerobatic, sport and scale models it is is designed to be used with 14” x 9~11” to 18” x 6” props.
Specification
Weight: 920g
Displacement: 19.96cc 1.218cu. In.
Bore: 30.4mm 1.197in.
Stroke: 27.5mm 1.083in
Power Output: 2.1/12000 (BHP/RPM)
Practical RPM: 2000-12000
Price: £269.99 (Including VAT at 17.5%)

O.S. FS120 Surpass E w/FS120SE Sil. Ref: l-os35530
This is the economy, suction-fed version of the FS120S engine - without a fuel pump or pressure regulated carb - but with all the other quality features found in the FS120S series of engines - the largest single cylinder 4 strokes in the O.S. range. Excellent for models where the fuel tank can be mounted normally. Designed to be used with 13” x 11~12” to 18” x 5~6” props. Supplied with an effective muffler and double lock nut system for the propeller.
Specification
Weight: 846g
Displacement: 19.96cc 1.218cu. In.
Bore: 30.4mm 1.197in
Stroke: 27.5mm 1.083in
Power Output: 1.9/11000 (BHP/RPM)
Practical RPM: 2000-11000
Price: £247.49 (Including VAT at 17.5%)

O.S. MAX 120AX Ring w/E-5020 Sil. Ref: l-os19210
O.S. MAX 120AX Ring w/E-5020 Sil.
Price: £152.99 (Including VAT at 17.5%)

RCV 130CD Four Stroke Ref: RCV130-CD
The engine still uses RCV's unique rotary valve system - which has only one extra moving component to a 2-stroke and so is easy to maintain. This ultra-compact engine is even shorter than conventional .90 4-stroke engines, so once again cowling will be much easier than other 4-strokes
So if you are looking for a reliable, easy to use 4-stroke engine, that is easy to cowl and sounds like the 'real thing' then the RCV130-CD engine is a perfect option to power your 90 - 120 size model.
Specification
Manufacture Die Cast
Engine Type 4-stroke - Glow ignition
Displacement 1.3 cu inch 21.3 cc
Max Power (approx.) 2 bhp 1.5 kw
Weight (exc. silencer) 35 oz 995 g
Length 5.35 inch 136 mm
Height - centre line axis 3.7 inch 95 mm
Propeller shaft diameter 5/16" UNF
Practical RPM range @ prop 2,400 - 10,000 rpm
Example prop size (2-blade) 15x8
Recommended Fuel 10% Nitro / 15% Oil
Price: £220.52 (Including VAT at 17.5%)

O.S. MAX 140RX FI Ref: l-os19230
The first engine in the world to be equipped with a fully automatic, computer controlled fuel delivery system.
After an initial set-up procedure, to cater for the fuel and propeller used, everything is then controlled by the computer.
There are no needles to adjust at all!! Due to its complexity, the Max 140RX requires a high-level R/C system to control it.
Check with your dealer to ensure that yours is compatible. Combine the sophistication of the 'Fuel Injection' system with the mechanical excellence that O.S. are famous for and you can see why this engine is set to become the standard in F3A class aerobatics.
Specifications
Displacement 23.0cc
Bore 32.0mm
Stroke 28.6mm
Power Output 3.5 / 9000 (BHP/RPM)
RPM
Weight 907g
Price: £710.99 (Including VAT at 17.5%)

O.S. MAX 140RX Ref: l-os19221
Designed for F3A aerobatic competition flying, the MAX-140RX packs 3.5BHP into a very compact engine.
Fitted with a new Type 70A carburettor & matching PL-06 fuel pump, the engine receives a positive, even fuel delivery and smooth throttle response - irrespective of the aircraft's attitude.
Supplied without silencer, it is designed to be used with a tuned pipe and 15” x 14” to 16” x 16” props.
Specifications
Displacement 23.0cc 1.40cu. in.
Bore 32.0mm 1.26in.
Stroke
Power Output 3.5 / 9000 (BHP/RPM)
RPM 1800 - 10000
Weight 830g
Price: £260.99 (Including VAT at 17.5%)

O.S. MAX 160FX Ring w/E-5010 Sil. Ref: l-os19260
The largest engine in the FX series boasts impressive bhp for its compact external dimensions. Its 'porting' has been optimised for low RPM's and is quite happy turning big props on a scale model or low diameter/high-pitch props on a pattern aircraft. The 'ringed' piston on this size of engine allows easy starting and has a forgiving nature when it comes to 'tuning' the main needle for optimum performance.
Specifications
Displacement 26.23cc 1.604cu. in.
Bore 33.6mm 1.323in.
Stroke 29.6mm 1.165cu. in.
Power Output 3.7 / 9000 (BHP/RPM)
RPM 1800 - 10000
Weight 925g
Price: £197.99 (Including VAT at 17.5%)

O.S. MAX BGX-1 (RN) w/E-5010 Sil. Ref: L-OS19301
The largest single cylinder engine in the O.S. range, the BGX-1 was designed to offer smoother running and a more compact size than equivalent capacity petrol engines together with light weight and easy operation.
The BGX-1 achieves all of these goals and produces 4.1BHP at 10,000rpm.
Ideal for large aerobatic, sport and scale applications and designed for 18” x 8” to 20” x 8~10” propellers. Comes complete with an E5010 silencer and cast radial mount.
Specifications
Displacement 34.97cc 2.13cu. in.
Bore 37.3mm 1.469in.
Stroke 32.0mm 1.260cu. in.
Power Output 4.1/ 10000 (BHP/RPM)
RPM 1500 - 1000
Weight 1340g
Price: £211.49 (Including VAT at 17.5%)

O.S. FT-160 Gemini Ref: l-os36108
This is a larger bore version of the original FT120 Gemini - completely redesigned to take advantage of five years' experience with the manufacture of the original model.
The Gemini 160 has a displacement of 26,5cc (1.62cu. in.) and offers greatly improved performance.
Its features include five ball bearings, ringed pistons and a special propeller locknut assembly as standard.
Ideal for large scale and sport models and designed to be used with 15” x 8” to 20” x 6” propellers.
Specification
Weight: 100g
Displacement: 13.26cc x2
Bore: 27.7mm
Stroke: 22.0mm
Power Output: TBA
Practical RPM: 2000-10000
Price: £584.99 (Including VAT at 17.5%)

O.S. FS200 Surpass w/F-6010 Sil. Ref: l-os35940
The largest, single-cylinder four stroke engine that OS has ever made draws on unrivalled experience in engine design. This powerful, high-torque engine has been created with scale and sports-scale modellers in mind. The ability to turn a big propeller, yet offer compact external dimensions, makes the fitment inside the ‘tight’ cowling of scale models a real joy. Fuelling is courtesy of a specially designed twin needle carburettor and like all the latest Surpass series, the internals have been lavished with the engineering care that only OS can achieve, whether that be precision machining, material selection or surface finish.
Specification
Displacement: 32.40cc (1.976cu.in.)
Bore: 38.00mm (1.496in.)
Stroke: 28.60mm (1.126in.)
Price: £269.99 (Including VAT at 17.5%)

O.S. FT-300 Super Gemini Ref: l-os36210
With a capacity of almost 49cc, this is the largest of the Gemini series of horizontally opposed engines.
For quarter scale models, its smoothness, power and realism make this a most convincing substitute for familiar chainsaw engine based two strokes.
The FT-300 features pushrod driven overhead valves, five ball bearings, ringed pistons and a special prop locknut assembly as standard.
Supplied complete with firewall engine mount, the FT-300 is designed for 18” x 10~14” to 22” x 8” props.
Specification
Weight: 1828g
Displacement: 24.38cc x2
Bore: 33.6mm
Stroke: 27.5mm
Power Output: TBA
Practical RPM: 1800-9000
Price: £719.99 (Including VAT at 17.5%)

O.S. FR5-300 Sirius Ref: l-os37000
This incredible 50cc five cylinder radial engine closely follows full-size practice in its design and construction, including the use of a geared double-track cam ring to operate its valve gear.
The Sirius features pushrod driven overhead valves, four ball bearings & two needle bearings, ringed pistons, a special inlet manifold assembly to balance the mixture distribution to the inlet pipes from the carburettor and a special propeller locknut assembly as standard.
Supplied complete with a radial mount, the FR5-300 Sirius is ideal for large scale models and is designed to be used with 18” x 12~14” to 22” x 8” propellers.
See the engine accessories at the end of this section for the optional front or rear exhaust collector rings specifically designed for this engine.
Specification
Weight: 2670g
Displacement: 9.95cc x5
Bore: 24.0mm
Stroke: 22.0mm
Power Output: TBA
Practical RPM: 1800-8500

Price: £1,529.99 (Including VAT at 17.5%)

O.S. IL-300 Dia-Star Ref: l-os36310
OS celebrated 70 years of model engine manufacturing in 2006. A depth of experience and technical knowledge that is unsurpassed in the field of model engines. Since the launch of their first engine - the ‘Type 1 Pixie’ back in 1936 - OS have strived to design and manufacture the best model engines in the world and their reputation has been built on innovation and strict quality control. Nowhere is this more clearly demonstrated than with their incredible line-up of multi-cylinder engines.
In celebration of their momentous anniversary, OS engineers have developed a masterpiece of precision engineering called the IL-300, an inline four-cylinder 4-stroke reminiscent of the De-Havilland engines used in aircraft like the Tiger Moth and Chipmunk. The design and manufacture of the key items, like the crankshaft and camshaft, make an engine of this nature even more difficult to build than a twin or flat multi cylinder engine. But OS have always risen to a technical challenge and such complex items seemed appropriate for a celebration of engineering achievement.
Very much built to be flown, the IL-300 has a capacity of 50cc and plenty of torque to swing big - 20” x 10” - propellers. Add to that the smooth carburation, plus the fabulous sound that 4 cylinders generates and you can easily see why this one is going to be irresistible.
Specification
Propeller Range: 18"x8"~20"x10"
Weight: 2,350g
Displacement: 50.20cc (3.06cu.in.)
Bore: 25.80mm (1.016in.)
Stroke: 24.00mm (0.945in.)
Practical RPM: 1800~8500 RPM

Price: £1,619.98 (Including VAT at 17.5%)

O.S. FF-320 Pegasus Ref: l-os36410
Closely following the design of many full-size light aircraft engines, the O.S. Pegasus 320 is a horizontally opposed four cylinder engine that has been developed from the 40cc Pegasus-240 introduced in 1986.
The Pegasus is unique: it is the only flat four model aircraft engine on the market. It is powerful, yet very easy to handle and incredibly free from vibration. It features pushrod OHV, seven ball bearings, ringed pistons and a special propeller locknut assembly as standard.
Supplied complete with a cast firewall mount, the FF-320 Pegasus is designed to be used with 18” x 10~14” to 22” x 8” props.
Specification
Weight: 2190g
Displacement: 13.26cc x4
Bore: 27.7mm
Stroke: 22.0mm
Power Output: TBA
Practical RPM: 1800-8500
Price: £989.98 (Including VAT at 17.5%)

THOR 45cc Petrol Ref: L-THOR45
The future is here! The THOR 45 CDI engine is a single cylinder, two-stroke petrol engine incorporating an easy-to-adjust Walbro carburettor with integrated pump, fully-electronic ignition system and a high-quality, dual-ring piston for exceptional power and ease of use.
The THOR 45 CDI engine also features heavy-duty aluminum engine mounting posts, an effective, high-volume silencer and a carburettor velocity stack as standard.
Until now, petrol engines have been relatively expensive and only available through specialist dealers. The Thor 45 is set to change all of that and will appeal to both expert and sport flyers alike. The CDI ignition unit has been especially designed to make operation simple and user friendly. Add the ability to swing some pretty impressive propellers and the fast increasing range of suitable ARTF models on the market today and you can see that bigger models are now within the reach of the average club flyer.
We are confident that this precision product will provide you with many hours of reliable, high-performance flying.
Specification
Recommended Propeller: 20x8, 20x10
Fuel/Oil Ratio: 25:1 to 40:1
Fuel Required: Minimum 91RON Unleaded with 2-Stroke Oil
Ignition Power Source: 6v DC (5 Cell NiCD/NiMH)
Ignition Type: DC-CDI (Fully Electronic)
IC Engine: Petrol
Weight: w/muffler 58.2oz (1650g)
Displacement: 45cc
Bore: 43mm
Stroke: 31mm
Power Output: Maximum of 4.2hp
Practical RPM: 1600-7800
Price: £199.99 (Including VAT at 17.5%)

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