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L-OS14000£160.94
The brilliant new O.S. 37SZ-H is the perfect choice when you want the ultimate in performance from your 30 class helicopter. Features a super-rigid crankcase, ringed piston/liner assembly, and a new carburettor for precision control, suitable for use with push-pull set ups. An outstanding performer.

SPECIFICATIONS
Bore:20.5mm (0.807")
Displacement:6.07cc (0.37cu.in.)
Power Output:1.4PS @ 18000rpm
Practical RPM:2,000 - 21,000

£160.94

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS14000
Item Name: OS Max 37SZ-H Ring
Brand: OS
See Further Items Recommended for OS-Max-37SZ-H-Ring
L-OS15550£191.39
The ultimate 50 class helicopter engine. Features a CNC machined cylinder head, for increased power with improved cooling, twin ball races, and a newly designed high performance carburettor for razor-sharp control of the immense power and torque available. Outstanding quality, with performance to match.

SPECIFICATIONS
Bore:22.0mm (0.866")
Displacement:8.17cc (0.50cu.in.)
Power Output:1.9PS @ 17000rpm
Practical RPM:2,000 - 20,000

£191.39

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS15550
Item Name: OS Max 50SX-H Ring - Hyper
Brand: OS
See Further Items Recommended for OS-Max-50SX-H-Ring---Hyper
L-OS15630£247.94
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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 O.S. has gained over many years and working extensively with the worlds 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.

SPECIFICATIONS
Bore:23mm (0.91")
Displacement:8.93cc (0.55cu.in)
Power Output:2.1PS @ 17,000rpm
Practical RPM:2,000 - 20,000

£247.94

Buy NowIn stock for immediate despatch.
Part No: L-OS15630
Item Name: OS Max 55HZ - Hyper
Brand: OS
See Further Items Recommended for OS-Max-55HZ---Hyper
L-OS15650£251.99
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The latest engine in the 600/50 helicopter class borrows much of its technology from the fabulous Max 91HZ-R, to provide class leading power under the most demanding of 3D manouevres.

The latest DRS system (Demand Regulator System) uses a crankcase pressure tap-off to pressurise the fuel tank via a one way valve. The pressurised fuel is then carfully regulated at the carburettor to provide the optimum mixture no matter what demands are placed on it. This is done by using the negative pressure in the carburettor venturi as part of the regulation system.

The carburettor itself has three mixture controls for low/mid and high speed settings.

SPECIFICATIONS
Bore:23mm (0.91")
Displacement:8.93cc (0.55cu.in)
Power Output:2.1PS @ 17000rpm
Practical RPM:2,000 - 20,000

£251.99

Buy NowIn stock for immediate despatch.
Part No: L-OS15650
Item Name: OS O.S. MAX 55HZ-R
Brand: OS
See Further Items Recommended for O.S.-MAX-55HZ-R
L-OS18620£304.49
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Designed primarily for the 3D flight and dramatic aerobatic manouevres.. Compared to the old 'Hyper' the new 91HZ-PS offers improved hovering stability as well as power at high speed to meet the further sophisticated 3D competition manouevres. A new design piston and crankshaft reduces vibration to provide further, stable torque over the entire RPM range.

The rectangular heatsink head is completely included in the cooling shroud for better cooling. The black alumite finish with O.S. and 91HZ-PS logo impart a distinctive image.

SPECIFICATIONS
Bore:27.7mm
Displacement:14.95cc
Power Output:3.5PS @ 15,000rpm
Practical RPM:2,000 - 16,000

£304.49

This item is currently out of stock.
Email me when availabe!
Part No: L-OS18620
Item Name: OS Max 91HZ-PS Ring - Pumped
Brand: OS
See Further Items Recommended for OS-Max-91HZ-PS-Ring---Pumped
L-OS18640£314.99
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This version of the Max 91HZ series utilises a completely different system for supplying and regulating the the fuel supply to the carburettor and is called DRS (Demand regulator system). Unlike the Max 91HZ-PS, the Max 91HZ-R utilises a pressure bleed from the crankcase to pressurise the main fuel tank. The pressurised fuel feed is then regulated by a newly designed regulator that is well isolated from the heat of the engine through its mounting position. That regulated fuel supply is then feed into the new 61E carburettor. The serious 3D flier now has the choice between a mechanically pressurised fuel system (Max 91HZ-PS) or the tank pressurised system in the Max 91HZ-R.

SPECIFICATIONS
Bore:27.7mm (1.091")
Displacement:14.95cc (0.912 cu.in.)
Power Output:3.4hp @ 15,000rpm
Practical RPM:2,000 16,000

£314.99

This item is currently out of stock.
Email me when availabe!
Part No: L-OS18640
Item Name: OS O.S. MAX 91HZ-R Ring
Brand: OS
See Further Items Recommended for O.S.-MAX-91HZ-R-Ring
L-OS18700£321.89
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The biggest, pure helicopter engine that OS have ever made delivers the levels of torque and power demanded by top fliers for both F3C and sport applications.

The 15% increase in capacity offers a big increase over the .91 class engines yet still fits in mounts designed for that class. Modification to the cooling shroud is also unlikely.

The distinctive 'blue anodised' cylinder head distinguishes the 105HZ engines from the 91HZ series yet retains the HZ series styling overall.

General internal design is very similar to the 91HZ series and draws on OS's deep experience in creating the best helicopter engines for all classes.

£321.89

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS18700
Item Name: OS O.S. MAX 105HZ
Brand: OS
L-OS18750£378.44
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The biggest, pure helicopter engine that OS have ever made delivers the levels of torque and power demanded by top fliers for both '3D' and sport applications.

The 15% increase in capacity offers a big increase over the .91 class engines yet still fits in mounts designed for that class. Modification to the cooling shroud is also unlikely.

The distinctive 'blue anodised' cylinder head distinguishes the 105HZ engines from the 91HZ series yet retains the HZ series styling overall.

£378.44

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS18750
Item Name: OS O.S. MAX 105HZ-R
Brand: OS
L-OS18751£487.19
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Identical to the regular 105HZ-R technically but supplied with the latest Powerboost 105 pipe. The pipe has been purpose designed to suit the 105HZ-R and will provide high power and torque across the RPM range without heat build up caused by restriction of gas flow.

£487.19

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS18751
Item Name: O.S. MAX 105HZ-R W/Powerboost Pipe
Brand: OS
L-OS38153£408.89
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The O.S. GT15HZ 2-Stroke petrol helicopter engine is also the first petrol engine designed especially for 90 class engine/ 700 size helicopters. With an approximate runtime ratio of 1 minute per 10cc of petrol, it offers astoundingly long flight times and low cost alternative to glow fuel.

Gasoline engines generates larger amount of heat. To prevent overheating, a large deep-finned head is employed which ensures a steady power supply by cooling entire engine efficiently.

The Ignition unit has been designed with ignition timing specifically for helicopter engines and features a straight plug cap for easier installation in the limited space.

£408.89

Buy NowSupplier stock. Despatch will take 3-5 days longer than our standard delivery time.
Part No: L-OS38153
Item Name: O.S. GT15HZ Petrol w/P.boost Pipe
Brand: OS
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