How It Works

The Jefferson Jyrodyne™ has a large rotor mounted horizontally inside a shrouded duct in the center of the fuselage. There is a tractor propeller mounted above and behind the shrouded duct. The drivetrain contains two engines, and two clutches. Both engines drive a common driveshaft. The clutches are located along the driveshaft, with one transferring power to the tractor propeller, and one to the horizontal rotor.

For vertical takeoff, the power is transferred to the horizontal rotor. Once airborne, the Jyrodyne is tilted forward, which causes it to move forward. At about 30 mph, the wings will support the aircraft, and the power is then transferred to the tractor propeller. The Jyrodyne then flies like a conventional aircraft.

The two clutches are shown in the center. The tractor propellor clutch and sprocket is on the right, with the clutch for the rotor on the left.
A 90° bevel gearbox is located on the right, with a special device called a “Flexidyne” located on the left. It mates to the large rubber coupling shown at the left in the first photograph. (Shown below)