Frank Halford's first design, the H-1, was just entering production and he was able to meet the power requirements of the Comet by scaling up the H-1.

The resulting H-2 used ten larger combustion chambers in place of the Goblin's sixteen smaller ones, using bifurcated "split intakes" which were fed by each diffuser duct to effectively make twenty inlets.

For production versions of the Tunnan, the Ghost was built under licence by Svenska Flygmotor (later to become Volvo Aero) as the RM2.

It was powered by the 5,000 lbf (22 kN) Ghost 50, which was the interim powerplant, pending the availability of the Rolls-Royce Avon engine which was to be used in the Comet 2.

During development, the Royal Air Force also asked for an improved version of the de Havilland Vampire with greater load-carrying capacity and thus a larger engine.