Other point to make about ETPS hunter spinning was that there was a telemetry link with a pilot on ground monitoring and assisting where necessary , i.e calling engine flamed out etc. Whilst working on the F6 in 1981 , launched the jet and went over to telemetry with safety pilot to watch,very interesting ! Especially the inverted spinning as for them it appeared so routine !! Recall blue peter presenter going for a spin with mike brookes , presenter did not enjoy himself , audio had to be dubbed on after !!!