O.S. MAX 32SX-H Ring w/o Drive Wash
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: £78.29
( Including VAT at 15% )
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OS Max 37SZ-H
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.
Specifications:
Displacement = 0.37 cu in (6.07 cc)
Bore = 0.806 in (20.5 mm)
Stroke = 0.725 in (18.4 mm)
Practical RPM range = 2,000 - 21,000
Output = 1.4 hp @ 18,000 rpm
Weight = 293g
Price: £88.08
( Including VAT at 15% )
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O.S. MAX 50SX-H Ring
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: £92.97
( Including VAT at 15% )
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OS Max 50SX-H Ring Hyper
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!!
Specifications:
Bore = 22.0mm 0.866in.
Stroke = 19.6mm 0.772in.
Power Output = 1.8 / 17000 (BHP/RPM)
Practical RPM = 2000 - 20000
Weight = 413g
Price: £102.75
( Including VAT at 15% )
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O.S. MAX 70SZ-H Ring
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: £149.73
( Including VAT at 15% )
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O.S. MAX 91RZ-H DH Ring
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: £156.58
( Including VAT at 15% )
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O.S. MAX 91SZ-H Ring PS-Hyper
Price: £190.83
( Including VAT at 15% )
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O.S. MAX 91SZ-H Ring
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: £156.58
( Including VAT at 15% )
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O.S. MAX 91SX-H Ring C-Spec Viper
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: £239.78
( Including VAT at 15% )
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