OS Engines - 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.

Features new intake porting, new carb - AND a redesigned crankcase that offers better support for the crank and thrust bearings.

Specifications:
Displacement: 0.91 cu in (15cc)
Bore: 1.02 in (25.8mm)
Stroke: 0.87 in (22.0mm)
Practical rpm: 2,000-16,000
Output: 3.3 hp @ 15,000 rpm
Weight w/o muffler: 21.3 oz (605 g)
Includes: #8 glow plug
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