The weight savings from deleting a bearing and associated parts listed below gave an engine with a thrust of 5,000 lbf but weighing only 800 lb.

The large-diameter thin-walled tube, more than 8 inches in diameter was stiff enough to raise the whirling speed beyond the engine running range using only two bearings instead of the usual three.

[5] Developing a Sea Level Static thrust of 4,520 lbf (20.1 kN), the Orpheus 701 had a 7-stage axial compressor driven by a single stage turbine.

They were and are so good that it was decided at an early date to make all Jetstars from serial number two up capable of using two Orpheus engines (as an alternative to four American units).

The Orpheus version ... is fully competitive in performance (except with one engine out) and will be offered to those who want its lower cost, simplicity, and - at least for some time - reliability".

Michel Wibault had the idea of using a turboshaft engine to drive four large centrifugal blowers which could be swivelled to vector the thrust.

[7] Data from Jane's All the World's Aircraft 1962-63.,[8] Aircraft engines of the World 1957[9] Orpheus engines, numbers 709 (destroyed by FOD in testing) and 711 (running) powered the Bluebird K7 hydroplane in which Donald Campbell was killed whilst attempting the water speed record on Lake Coniston in 1967.