That is beyond mental.
I wouldn’t want to have been the person trying to sell the idea to the pilot.
For a big chopper, that’s not such a dodgy thing to do.
However, have you ever watched a C-130 do a Khe Sahn drop? Bringing a 78 ton aircraft in at low speed at 500ft, then just dropping the nose straight down requires an enormous act of faith that the bloody thing is going to pull up at the bottom! Whoever first suggested it must have been mad, whoever first tried it almost suicidal!
I’ve watched Hercs practicing it at Lyneham, from my work studio window, and it was heart-stopping every damned time.
[video]http://www.youtube.com/watch?v=GtObGx-XrhQ&sns=em[/video]