Sorry. But I flew a Chippie with a Rover gas turbine (about 100 bhp) in 1965. Basically the same engine they used as an APU in the Vulcan. It flew very well and MOD were interested because at that time Gypsy spares were becoming difficult - problem later solved when main spar fatigue halved the fleet-size. CFS felt (and I agreed with them) that the acceleration from idle rpm in event of a botched landing was too slow. A Continental or Lycoming solution was the most favoured.