Bell Model 65

Two 1,000 lbf (4.4 kN) thrust Fairchild J44 turbojet engines - as used on drones, missiles and for JATO - were mounted one on each side of the aircraft under the wing.

A Turbomeca Palouste turbocompressor powered small thrusters at the tail and wingtips to provide a reaction control system during hover.

This was performed with the aircraft raised on a platform to avoid the reingestion of its exhaust gases.

Wheeled landing gear - from a Cessna - was added to the aircraft, which went on to make horizontal flights in 1955.

It proved able to make partial conversions at altitude, however it lacked sufficient engine thrust to complete the transition.