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L-OS30900£269.69
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The first in a completely new series of four stroke engines aimed squarlely at the sport and scale modeller.

Stying is deliberately 'retro' and in keeping with the style of the very first OS four strokes. The original FS-120 had twin rocker covers and so do many full size engines in older aircraft. But 'retro' stying does not mean 'retro' technology! The FS-95V is a sophisticated piece of kit, delivering strong power and torque and offers a cost effective alternative to the FSa-81.

The 60P carburettor is a twin needle design for great throttle response and reliable idling.

SPECIFICATIONS
Bore:29mm (1.142")
Displacement:15.59cc (0.95cu.in)
Power Output:1.7 @ 10,000 rpm
Practical RPM:2,100 - 11,000

£269.69

Buy NowIn stock for immediate despatch.
Part No: L-OS30900
Item Name: OS O.S. FS-95V w/F-5050 Silencer
Brand: OS
See Further Items Recommended for O.S.-FS-95V-w/F-5050-Silencer
L-OS34300£287.09
The FSa-56 is the first engine from the new 'Alpha' series of advanced four strokes. With increased levels of power and torque over its predecessor, the FS52 Surpass, the new FSa-56 has razor sharp throttle response, a new internal breather/oil recirculation system, and dramatic futuristic styling.

SPECIFICATIONS
Bore:24.0mm (0.945")
Displacement:9.32cc (0.569cu.in.)
Power Output:1.0PS @ 10,000rpm
Stroke:20.6mm (0.811")

£287.09

Buy NowIn stock for immediate despatch.
Part No: L-OS34300
Item Name: OS FSa-56 With F4040 Silncer
Brand: OS
See Further Items Recommended for OS-FSa-56-With-F4040-Silncer
L-OS34720£339.29
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The brilliant O.S. FSa-72 offers extremely compact external dimensions combined with excellent levels of power and torque. Like all the FSa series, the FSa-72 has internal crankcase oil re-circulation, a super-smooth carburettor with anti 'spit' inlet and an ultra-quiet silencer. If you have a flying field 'noise' problem, then this is the engine you need. The new 61N carburettor provides both linear and fuel efficient mixing to gain you reliability and precison control at all RPMs.

SPECIFICATIONS
Bore:27.0mm (1.063")
Displacement:0.72cu.in. (11.79cc)
Power Output:1.2PS @ 11,000rpm
Practical RPM:2,400 - 12,500

£339.29

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS34720
Item Name: OS FSa-72 With F5030 Silncer
Brand: OS
See Further Items Recommended for OS-FSa-72-With-F5030-Silncer
L-OS34810£291.99
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 emanates from it. A propeller locknut assembly is of course standard.

SPECIFICATIONS
Bore:27.7mm (1.091")
Displacement:13.26cc (0.809 cu.in.)
Power Output:1.3PS @ 11,000rpm
Practical RPM:2,200 - 12,000

£291.99

This item is currently out of stock.
Email me when availabe!
Part No: L-OS34810
Item Name: OS FSa-81 With F5030 Silncer
Brand: OS
See Further Items Recommended for OS-FSa-81-With-F5030-Silncer
L-OS35420£434.99
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The FSa-110-P is a great engine to increase power when you want to replace a .91 as it has the same mounting dimensions. Now you can enjoy the added benefit of a fuel pump with this new version of the 110FS-a. Plenty of torque to swing large props. Ideal for aerobatics and other situations that demand high power in all attitudes.

SPECIFICATIONS
Bore:30.4mm (1.20")
Displacement:18.0cc (1.10cu.in.)
Power Output:1.8PS @ 10,000rpm
Practical RPM:2,000 - 11,000

£434.99

Buy NowIn stock for immediate despatch.
Part No: L-OS35420
Item Name: OS FSa-110P Pump W/F-5040 Si
Brand: OS
See Further Items Recommended for OS-FSa-110P-Pump-W/F-5040-Si
L-OS35430£400.19
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The biggest engine in the 'Alpha' series has been designed with both aerobatic and scale modellers in mind.

The pumped fuel system deals with the demands of aerobatic fliers who demand consistent power in any attitude and is tolerant to variations in fuel tank location. With consistant fueling, the FSa-155-P then goes about its business of delivering that stunning 2.6PS of power when you demand it. But that is only part of the story. The strong spread of torque down the RPM range allows a wide variation of propeller loads to suit both aerobatic and scale modellers alike by 'picking up' cleanly and strongly as the throttle is opened and being tolerant to those different propeller loads.

SPECIFICATIONS
Bore:33.6mm (1.323")
Displacement:25.36cc (1.548cu.in)
Power Output:2.6PS @ 10,000 rpm
Practical RPM:2,000 - 10,000 rpm

£400.19

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS35430
Item Name: OS O.S. FSa-155-P
Brand: OS
See Further Items Recommended for O.S.-FSa-155-P
L-OS35530£337.49
The FS120 is available in two versions, this is the more economical suction fed version. Supplied with a high precision twin needle carburettor for smooth efficient control of the massive power available. Perfect for use with larger sport, aerobatic and scale models, supplied complete with silencer.

SPECIFICATIONS
Bore:30.4mm (1.197")
Displacement:19.96cc (1.22cu.in.)
Power Output:1.9PS @ 11,000rpm
Practical RPM:2,000 - 11,000

£337.49

Buy NowIn stock for immediate despatch.
Part No: L-OS35530
Item Name: OS FS120 Surpass E
Brand: OS
See Further Items Recommended for OS-FS120-Surpass-E
L-OS36108£956.99
There is nothing quite like the sound and smoothness of a multi-cylinder four stroke engine, and nobody has more experience in this area than O.S. The twin cylinder Gemini FT-160 has a displacement of 26.5cc, and features five ball races, ringed piston/liner assemblies, and a special propeller locknut.

SPECIFICATIONS
Bore:27.7mm
Displacement:13.26cc (x2)
Practical RPM:2,000 - 10,000
Stroke:22mm

£956.99

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS36108
Item Name: OS FT-160 Gemini
Brand: OS
See Further Items Recommended for FT-160-Gemini
L-OS36410£2,087.99
Closely following the design of many full-size light aircraft engines, the O.S. Pegasus 320 is a horizontally opposed four cylinder engine. 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. The FF-320 Pegasus is a unique engine that will exceed all your performance and quality expectations.

SPECIFICATIONS
Bore:27.7mm
Displacement:4x 13.26cc
Practical RPM:1,800 - 8,500
Propeller Range:18x10, 20x8-10, 22x8

£2,087.99

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS36410
Item Name: OS O.S. FF-320 Pegasus
Brand: OS
See Further Items Recommended for O.S.-FF-320-Pegasus
L-OS37010£4,001.99
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Since 1986, O.S. owners have enjoyed the unique experience of owning and operating the fabulous FR5-300 Sirius 5 cylinder radial. Models have become bigger over the years and O.S. wanted to release a new radial engine to cater for that market. The result is the gorgeous FR7-420. With 7 cylinders and a capacity increase to nearly 70cc, the FR7-420 offers a dramatic increase in both torque and power. In keeping with the scale image set by the Sirius, the new FR7-420 has been styled in the same way with front pushrods and separate rocker boxes for the inlet and exhaust valves.

£4,001.99

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS37010
Item Name: OS O.S. FR7-420 Sirius 7
Brand: OS
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