New Supersonic Jet Engine was First Flight - The Short Sperrin with Gyron engine just after its take off. The new engine is in the enlarged lower port nacelle.First flight of the De Havilland Gyron Jet engine in the short Sperrin bomber was recently announced. It took place at Aldergrove Aerodrome near Short's works in Belfast and was completely successful, the Gyron being opened up to its full flight approved ***** engine has been designed for supersonic flight and is of very high power. July 29, 1955. (Photo by Reuterphoto).