Loki,
Trust me, from out on the airfield - I seem to remember we had our caravan near the VTOL pit - they were sensational! Especially when, after one particular pass, the usual noise did not come on after the usual 'x' seconds after it passed overhead - and we all rushed out the 'van to see the VC10 just climbing away from a very very very low altitude at very high alpha supported on solid black carbon and solid noise!
Saman