Tedgar
Member
That makes sense. We have a sprag clutch in the transmission of the helicopters I fly. Keeps the failed engine drive shaft from stopping the rotors in case of autorotaion. Hopefully they are made better since they cost several hundred thousand dollars.This is more likely to be the large drive pulley sprag clutch bearing, when it fails you can loose assistance from the motor, but also the little sprag teeth inside the bearing can temporarily jam in the bearing races. Either way it's time to get the spanners out or send it back for a new one.