It was capable of flying at a gross weight of more than 50,000 pounds (23,000 kg), but proved too inefficient and cumbersome to be mass-produced beyond the prototype unit.

The cockpit was from a Waco CG-15 military glider and the tail rotor from a Sikorsky H-19 Chickasaw was used for yaw control.

The giant helicopter was tested in Culver City, California over a three-year period beginning in 1952.

Two General Electric J35 turbojet engines were used, sending bleed air up through the rotor hub.

This drive system was inefficient, limiting the test aircraft to a range of only 40 miles (64 km).