working on the aifield at binbrook in the early eighties, the C.O. was doing an airtest. we were asked to stay put and wait for further instructions. we watched the test from where we were, but knew a vertical climb was the last thing. he came straight down the runway extremely low and just as he passed us he stood it on its tail.it took 5 mins for my stomach to settle and my hearing to return and also a trip back to seco7 for a change of underwear.