O.S. Engine 91RZ-H DH Rear Exhaust Ringed Heli Engine  [OSMG1979]

Unleashing Power: The O.S. Engine 91RZ-H DH for Scale Helicopters

For RC helicopter enthusiasts who crave precision and authenticity, the O.S. Engine 91RZ-H DH delivers unparalleled power and engineering finesse. This rear-exhaust marvel is engineered to seamlessly integrate with scale models like those from Hirobo, maintaining the sleek aerodynamic lines these models are renowned for.

Designed for Performance and Precision

The O.S. 91RZ-H DH is not just another engine; it's a testament to advanced engineering tailored for serious RC pilots. With a displacement of 0.91 cubic inches and a robust output of 3.3 horsepower at 15,000 RPM, this engine promises thrilling performance from a practical RPM range of 2,000 to 16,000. Its innovative design includes new intake porting and a redesigned crankcase, ensuring stability and efficiency even under the most demanding conditions.

Cooling Innovation: Two Heat Sink Options

One of the standout features of the 91RZ-H DH is its dual heat sink head options. Choose between a larger, blue anodized head for enhanced cooling efficiency or a compact, squared die-cast head that fits snugly in confined spaces. This flexibility allows pilots to customize their setup based on specific cooling demands and aesthetic preferences.

Perfect Fit for Scale Enthusiasts

Scale modelers understand the importance of maintaining authentic lines and proportions. The rear-exhaust design of the 91RZ-H ensures that it fits neatly within the canopy, preserving the integrity of your model's scale appearance without compromising on performance.

The O.S. Engine 91RZ-H DH is ideal for scale helicopter enthusiasts who demand top-tier performance and precision. Its innovative design and flexible cooling options make it a powerful choice for any serious RC pilot.