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ID: l-OS15490

OS Engine MAX 46AXII w/E-3071 Silencer

l-os15490 - Main Image

Designed to succeed the original 46AX, the new 46AX MkII retains the same mounting dimensions, but O.S. have updated the styling to bring it into line with the current range of AX engines. That means the introduction of the highly efficient and unique cooling fins to keep temperatures under control while the precision carburettor, with its angled needle valve keeping fingers safely away from the propeller disc, offers the linear response across the entire rpm range that you would expect from O.S. Optimised to produce its power at low rpms - and thanks to the highly effective ‘Powerbox’ silencer - the engine produces even less noise too.

Specification

Weight:

489g (17.2oz)

Displacement:

7.5cc (0.455cu.in.)

Bore:

22.0mm (0.866")

Stroke:

19.6mm (0.772")

Power Output:

1.63hp @ 16,000 rpm

Practical RPM:

2 - 17,000

£136.99

ID: l-OS15612

OS Engine MAX 55AX (40K) with E-3070 Silencer

l-os15612 - Main Image

Designed to combine maximum power with razor sharp throttle response in the smallest possible crankcase, the 55AX has the same mounting dimensions as the popular 46AX above, but an increase in power to 1.75PS. The dramatic AX fin styling is used for optimum cooling and the rearward angled needle on the carb makes adjustments safer. The new 40K carb and also helps increase the horsepower over the previous 40J model. Perfect for sport, scale and aerobatic models.

Specification

Weight:

525g (18.52oz) with Silencer

Capacity:

8.93cc (.545 cu.in)

Propeller Range:

12x7-8, 13x6-7

Bore:

23mm (.906")

Stroke:

21.5mm (.846")

Power Output:

1.68hp (1.75 PS) @ 16,000rpm

Practical RPM:

2,000 - 17,000

£152.99

ID: l-OS13100

OS Engine MAX 35AX w/E-3080 Silencer

l-os13100 - Main Image

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

Weight:

280g (9.88oz)

Capacity:

5.77cc (0.352cu.in.)

Propeller Range:

10 x 6, 10 x 7, 11 x 5, 11 x 6,

Bore:

20.2mm (0.795in)

Stroke:

18.0mm (0.709in)

Power Output:

0.9PS @ 11,000rpm

Practical RPM:

2,500 - 13,000

£164.99

this item is currently out of stock.

ID: l-OS12662

O.S. MAX 25FX II with 892 Silencer

l-os12662 - Main Image

The O.S. Engine 25FX II is a high performance side exhaust aero engine that is suitable for many styles of small R/C aircraft such as sport, scale, aerobatic and even .25 class pylon racers.

The 25FX II uses a direct needle 21L carburettor for excellent usability and a 892 silencer with adjustable exhaust direction.

O.S.'s legendary standard of build quality is evident throughout.

Specification

Weight:

260g (9.17oz)

Capacity:

4.07cc (0.248 cu.in.)

Bore:

18mm (0.709")

Stroke:

16mm (0.630")

Power Output:

0.84 ps (0.83 hp)

Practical RPM:

2,500 - 19,000

£199.99

ID: l-OS15550 OS Engine MAX 50SX-H Ring Hyper

l-os15550 - Main Image

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:

22mm (0.866")

Stroke:

19.6mm (0.772")

Power Output:

1.8hp @ 17,000rpm

Practical RPM:

2,000 - 20,000

£234.99

ID: l-OS16521

OS Engine MAX 65AX w/E-4010A Silencer

l-os16521 - Main Image

Designed as a replacement for the long established Max 61FX, the new Max 65AX has all the features of the new AX series, such the same mounting bolt pattern and silencer bolt dimensions, making a direct replacement for most 61 class engines. The real bonus 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.

The silencer is effective and a great benefit to flying fields with sensitive noise iossues. Effective silencing is very much part of the AX design philosophy.

Carburation is the usuall OS 'exemplary' standard and very much why OS engines are regarded as the best! That comes from careful design and testing allied to stringent manufacturing standards.

Specification

Weight:

497.0g (17.53oz) w/o Silencer

Weight:

653.og (23.03oz) w/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

£254.99

ID: l-OS17400

OS Engine MAX 75AX w/E-4040 Silencer

l-os17400 - Main Image

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

Weight:

578g (20.39oz) w/o silencer

Capacity:

12.29cc (0.75 cu.in.)

Propeller Range:

13x8-10 14x6-8

Bore:

25.8mm (1.016")

Stroke:

23.5mm (0.925")

Power Output:

2.4PS @ 15,000

£279.99