OS Max 91 Sz-H Engine Rc Helicopter

Brand new OS91 Engine this is the engine the top pilots have been using in competition this year and is now finally available.
Newly designed crankcase has high rigidity and develops stable power.
By seeking the best balance at high rpm while succeeding a bore/stroke that has good results, stability at both hovering and air flight is established.
Equipped with a new twin-needle 10.6mm big bore 60M-C carburetor.
A big blue alumite heatsink head ,which has laser marking of "laurels" motif, develops high radiation effect.
Specifications:-
Displacement:14.95cc
Bore:27.7mm
Stroke:24.8mm
Practical r.p.m.Range:2000 ~16000rpm
Output:3.3ps / 15000rpm
Weight:605 g