Crab, so what is 0.75 of the downwash of a B2 then ? having loads of time in a B3 with a line lifting I would suggest that its downwash speed is pretty close to 1000 ft plus a minute. In over a 1000 hours of lifting on a longline never experienced the " hole" or near vortex ring. What have had is getting pretty close to dumping the load a I have let the ac and load build up too much energy on a steep approach and got my energy management all wrong, ended up luckily getting the load on the ground as the FLI hit 10 banana's and a bong in the headset. No damage done aprart from a quick change of underwear and that was just the ground crew !!!!!!! Just as well I was wearing brown trousers