O.S. MAX-91 VR-DF WITH SMALL HEAD DUCTED FAN ENGINE

• Displacement: 0.91 cu in
• Bore: 27.7mm (1.09")
• Stroke: 24.5mm (.97")
• Max Output: 4.8 BHP at 22,000 RPM
• Practical RPM Range: 2,500 - 25,000 RPM
• Weight: 662g (23.4oz)

Rear Exhaust
Schnuerle Porting
2-piece Crankcase
2-Crankshaft Ball Bearings
Rear-Mounted Carburettor
Drum Rotor Induction
ABC piston/cylinder (aluminium piston with a chromed brass cylinder)