From Ken Trent's excellent book Bomb Doors Open, a description of what it was like to deliver his first 22000lb Grand Slam onto a submarine base near Bremen in March 1945:
If the aircraft had leapt when we delivered a Tallboy, it was nothing compared to what it did when we let go of the Grand Slam. Relieved of its 10-ton weight, the souped-up Lanc shot upwards like a rocket, pushing us all into our seats while the engines blared with noise. I felt as though I was being squashed down to just a few inches tall as my head pressed down through my shoulders; my arms felt like lead on the control column. Fortunately there was no other kite above us or it could have been disastrous... all of the 20 kites which had taken off landed safely and later photos showed we had dropped two Grand Slams dead on target and smashed two great holes right through the roof of the submarine base so the Germans had to abandon it after two years of work.