O.S. Engine 91RZ-H Rear Exhaust Ringed Heli Engine  [OSMG1978]

Unleash Realistic Flight with the O.S. Engine 91RZ-H

Pilots of scale helicopters, rejoice! The O.S. Engine 91RZ-H is here to redefine your flying experience. Designed specifically for those who crave authenticity and precision, this rear-exhaust marvel seamlessly integrates into the sleek canopy lines of popular models like Hirobo. Not just about looks, the 91RZ-H packs a punch with its upgraded performance features. Let's dive into why this engine is a must-have for serious RC helicopter enthusiasts.

Advanced Engineering for Superior Performance

The O.S. Engine 91RZ-H takes innovation to the next level with its redesigned intake porting and carburetor system. This isn't just about achieving higher RPMs; it's about delivering smooth, reliable power across the spectrum. The engine's redesigned crankcase provides enhanced support for both the crank and thrust bearings, ensuring durability and optimal performance under stress.

Cooling Options Tailored to Your Needs

Understanding that different pilots have unique requirements, O.S. Engine offers two heat sink head options. Choose between a larger blue anodized head for maximum cooling efficiency during intense operations, or a compact squared die-cast head (DH) for those who prefer a streamlined profile without sacrificing performance.

The O.S. Engine 91RZ-H is perfect for scale helicopter enthusiasts who demand both performance and authenticity. Its superior engineering and flexible cooling options make it a versatile choice for any serious hobbyist.