Improved design of clutch control system of unmanned helicopter | Semantic Scholar
CH-47D Power Train System
Tron Helicopters Clutch with one way bearing | ercMarket
Is there any clutch mechanism between main engines and the main rotor of a helicopter? How is engine of a helicopter connected to its main and tail rotors? - Quora
Processes | Free Full-Text | Analysis of Dynamic Engaged Characteristics of Wet Clutch in Variable Speed Transmission of a Helicopter
Changes to belt stretching guidance after Whitsundays R44 drive system failure | ATSB