91RZ-H Rear Exhaust Ringed Heli Engine

91-sized power designed for scale helis!

Terrific news for your heli modelers: the popular and powerful .91 ringed engine now comes in a rear-exhaust design!

• Pilots of Hirobo and other scale machines will appreciate how the 91RZ-H power plant will fit inside the canopy to preserve the heli's scale lines.
  
  
• Like the side-exhaust 91SZ-H, the 91RZ-H features new intake porting, new carb and a redesigned crankcase that offers better support for the crank and thrust bearings.
  
  
• Available with with a larger, blue anodized head for more efficient cooling (OSMG1978) or a low-profile, square die-cast head (OSMG1979).