O.S. 55 HZ-H Hyper Ringed Competition Helicopter Engine HV Mini or in a drill press

or in a drill press

Use for OUTRAGE 50 Nitro

Lynx Heli Innovations upgrade itself and offer now a new 180 CFX tail pitch slider edition

yet managed to push performances a notch higher still

O.S. 55 HZ-H Hyper Ringed Competition Helicopter Engine HV Mini or in a drill pressO. S. 55HZ H Hyper Ringed . 55 Helicopter Engine The O. S. 55HZ H Hyper Ringed is one of the most successful . 55 class nitro helicopter engines ever produced. Designed specifically for high performance RC helicopters, the 55HZ H delivers impressive power, crisp throttle response, and legendary O. S. reliability in a compact package. Developed to provide power comparable to many . 60 class helicopter engines while maintaining the weight and footprint