The Chinook helicopter synchronises both sets of rotor blades too, they are both driven from the same drive shaft. https://chinook-helicopter.com/standards/are

The Chinook helicopter synchronises both sets of rotor blades too, they are both driven from the same drive shaft. https://chinook-helicopter.com/standards/areas/drive_train.html https://chinook-helicopter.com/standards/areas/drive_train.h... covers the gearboxes and driveshafts with https://www.chinook-helicopter.com/standards/areas/blade.html https://www.chinook-helicopter.com/standards/areas/blade.htm... covering the rotor blades.