Another term for a single gyron is esquire. These included the de Havilland Gyron and Rolls-Royce RB.106. It was also known as "le mess de gyron," girunt, and dilgirunt. Limitations included poor fuel consumption of the Gyron Junior and engine surging. The Gyron Junior was a scaled-down derivative of the de Havilland Gyron. It was powered by a pair of de Havilland Gyron Junior turbojets, producing of thrust. Subsequent inspections concluded that the Gyron Junior engine was no longer safe to fly. The Gyron Junior was a two-fifths flow scale version of the existing Gyron engine. The Ford Motor Company of Detroit gave credit for the Gyron to Louis Brennan. This last accident brought Gyron Junior flying to a halt forever. A D.H Gyron Junior is on public display at East Midlands Aeropark. The Gyron Gy1 replaced the lower Avon in the port nacelle (see image). The Gyron was also one of the first engines designed specifically for supersonic flight. The turbojet engine selected was the de Havilland Gyron Junior, capable of generating of thrust. The word "gyron" is derived from Old French "giron", meaning 'gusset'.