Official Guide for Crash Prevention & Airworthiness CRITICAL FOREWORD Class 450 and larger electric RC helicopters are high-speed, high-load professional aircraft. Therefore, metal load-bearing components—such as feathering shafts, main shafts, drive gears, and linkage rods—do not possess lifetime attributes. Because metal fatigue is an irreversible physical phenomenon, it never constitutes a product quality defect. Consequently, […]
