A needle valve extension that allows the main needle valve to be adjusted when the engine is mounted in a cowled model. Manufactured from flexible stranded wire so that the needle is protected from vibration damage.

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The smallest engine in the OS range supplied with effective silencer a glow plug and rear needle.



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Compact yet very powerful with minimum fuss and maximum reliability.
This engine is supplied with rear needle and quiet 871 muffler.



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This reliable performance engine has all the design advantages of the latest LA series and is supplied with `safety` rear needle assembly and extended crankshaft.



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Physically identical to the 40LA but with a 20%increase in power. Supplied with A3 glowplug as standard plus the highly effective E-3030 Silencer.


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This low-cost lightweight engine is also reliable and easy to handle.


The needle valve is mounted at the rear of the motor allowing a safe distance from a spinning propeller.

This small high performance engine has a twin ball-raced crankshaft; full Schnuerle porting and large bore carburettor which all contribute to the 0.5PS power output.


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Developed from the fabulous 25FX, the new 25AX inherits the dramatic styling of its AX siblings and provides class leading power and torque for both sports flying or even Pylon racing!

The new E-3080 muffler is extremely effective and has been optimised to prevent any unnecessary power loss.
The mounting pattern ensures that the new 25AX will just drop in to any model designed around the old 25FX.
Typical RPMs 9 x 5 - 15100rpm, 9 x 6 - 13500rpm, 10 x 5 - 11650rpm

Weight: 275g (9.7oz), Sil 83g (2.93oz)
Displacement: 4.07cc (0.248cu in)
Bore: 18.0mm (0.709in)
Stroke: 16.0mm (0.630in)
Power Output: 0.80PS @ 16000rpm
Practical RPM: 2500 - 17000


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Specification:

Capacity: 5.77cc (0.352cu.in.)
Propellers:
10 x 6, 10 x 7, 11 x 5, 11 x 6
Weight: 280g (9.88oz)
Bore: 20.2mm (0.795in)
Stroke: 18.0mm (0.709in)
Power Output: 0.9PS @ 11,000rpm
Practical RPM: 2,500 - 13,000


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 its substantial power increase.


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This first engine in the AX series features a new rear-mounted needle valve system that tolerates crash damage better.

Also features the new `P-Box` silencer and ringless piston and liner system.

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Designed to combine maximum power with razor sharp throttle response within the smallest possible crankcase.

The dramatic AX fin styling is used for optimum cooling and rearward angled needle makes adjustments safer.

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The replacement for the long established Max 61FX, the new Max 65AX has all the features of the new AX series, but retains the same mounting bolt pattern and silencer bolt dimensions, making it a perfect choice for a direct replacement for most 61 sized engines.

The best news is more power and torque for the same basic external dimensions.

Like all the AX series, cooling has been improved by the use of deep finning on the crankcase and cylinder head combined with the new fin pack shape.

More good news; A more effective silencer for those flying fields where noise is an issue.

Specification

Weight: 653.og (23.03oz) w/Silencer

Weight: 497.0g (17.53oz) w/o Silencer

Propeller Range: 12 x 6, 13 x 6/7, 14 x 6

Displacement: 10.63cc (0.649cu.in)

Bore: 24.0mm (0.945in)

Stroke: 23.5mm (0.925in)

Power Output: 1.75PS @ 16000rpm

Practical RPM: 2,500 - 12,000

The New 75AX is supplied with P-Box style muffler and 61A carburettor with angled needle valve.

The same crankcase dimensions as the 61FX make upgrading straightforward.

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Designed to replace the 91FX yet retain the same mounting dimensions but with increased power and torque.

The design has been optimised to produce strong torque and power at modest RPMs and exploit the extremely effective nature of the E-4040 silencer. This concept becomes important as noise becomes less and less acceptable. Like all the latest AX series engines, the highly effective and unique cooling fins keep temperatures under control and the carburettor, the precision you would expect from OS.



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Third engine in the AX series with a distinctive shape that is hard to ignore. Has peak power of 3.1PS at 9000RPM and features a neat needle valve and silencer system.

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Largest engine in the FX series; it boasts an impressive bhp for its compact external dimensions.


The ringed piston allows easy starting and is supplied with the effective E-5010 silencer and locking propeller nut system.

Developed for small helicopters this high performance engine has a new large bore carburettor to provide stable hovering characteristics.

Features include twin ball raced crankshaft enlarged cylinder head and mounting holes.



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Brings a new level of performance to `30-class` helicopters.


Features super-rigid crankcase; ringed piston and liner and optimised crankshaft for precision control power and smoothness.

The best `50-class` engine on the market. Features CNC cylinder head to give better power and improve cooling and new carburettor.



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The max 50SX-H Hyper has established an enviable reputation for power, reliability and ease of use. The Max 55HZ Hyper moves that to a whole new level!

Designed primarily with the demands of the 3D pilot in mind, the 55HZ Hyper delivers 61 size performance in a 46 size crankcase. That power comes from the extensive experience that OS has gained over many years and working extensively with the world?s top pilots to refine all aspects of the engine without compromise in any area.

By using the same mounting layout, you can drop a 55HZ into any model that previously suited the 50SX-H without modification. Just the area around the new carburettor is a little bigger and may require adjustmenst to the cooling shroud.

This entirely new engine shares almost nothing with the 50SX-H and has some new features not seen on an engine of this size before. The rear bearing is now designed to resist corrosion, the new 40L carburettor has three adjustments to cater for idle, mid range and full power. Until now, these features were the domain of 61 class engines or bigger. The throttle arm has four leaves so that push pull control is easy from any direction. The heatsink head is bigger for improved cooling as well.

Produces copious quantities of power across the rev range without sacrificing its ability to perform precision hovering.

Features new stronger crankcase; 3-needle carburettor and liner/port design.