Robotic & Radio Control Toys › O.S. Engines › Helicopter

A Hyper engine for hyper heli performance! The 50SX-H Ringed Hyper is ideal fo... A Hyper engine for hyper heli performance! The 50SX-H Ringed Hyper is ideal for 50-class helis with improved combustion efficiency for super-stable hovering and aerobatics. For over-the-top flying excitement the 50SX-H Ringed Hyper engine is the clear... more

Save on the OS Engines 105HZ 1.05 Helicopter Engine - OSMG1960 at Horizon Hobb... Save on the OS Engines 105HZ 1.05 Helicopter Engine - OSMG1960 at Horizon Hobby today! Shop the large selection of Heli Engines .41 & Over more

Small in size — delivers big 3D power! The 55HZ-H Hyper Ringed from O.S. has... Small in size — delivers big 3D power! The 55HZ-H Hyper Ringed from O.S. has the power and reliability to make your heli do virtually whatever you want! Capable of installing in the same space as the 50SX-H Hyper it features a brand-new 3-needle 40L... more

Huge power and performance! In order for 90-sized machines to nail huge maneuv... Huge power and performance! In order for 90-sized machines to nail huge maneuvers and hardcore smackdown-style 3D it s all about power and the 105HZ-R has it in abundance. Displacement has been increased by 15% while a huge venturi rams air into the... more

State-of-the-art power for serious heli pilots! The 55HZ-R DRS Ringed delivers... State-of-the-art power for serious heli pilots! The 55HZ-R DRS Ringed delivers state-of-the-art power for serious heli pilots! It includes the Demand Regulator System for outstanding run consistency and a built-in mount for Futaba GY701 and CGY750 rpm... more