O.S. Engine OS-18645 SPEED 91HZ-R 3D Performance Boost Helicopter Engine  [OS-18645]

Engineered for Advanced 3D Helicopter Performance

The O.S. Engine OS-18645 SPEED 91HZ-R 3D represents a refined approach to helicopter powerplants. Built for pilots who demand strong, controllable thrust, this unit integrates a Power Boost Pipe that enhances exhaust dynamics to improve midrange power and throttle feel. It is a practical upgrade for competition and sport pilots looking for dependable performance.

Strong Throttle Response and Smooth Power

The Power Boost Pipe on the SPEED 91HZ-R 3D refines exhaust flow to deliver a smoother power curve and better low to mid throttle torque. That translates into cleaner 3D moves and more predictable behavior during aggressive hover transitions and punch outs.

Durable Design for Ongoing Use

O.S. Engines are known for their build quality, and the SPEED 91HZ-R 3D is no exception. The engine is constructed to handle high RPMs and sustained loads while offering fuel economy that helps extend flight time and reduce running costs for regular flyers.

The O.S. SPEED 91HZ-R 3D with Power Boost Pipe is aimed at experienced RC helicopter pilots who want increased control and stronger midrange power. Its combination of performance and durability makes it a practical choice for serious hobbyists.