I hope the instructor who 'throttle chops' you realises you have had a few beers

, oh, and that it's not a practice which should really be used in training.
I was told that an increase of 10% RRPM from 104% on an R22 causes the force on the spindles to go from 4.5 tons of pull to 9 tons of pull. Any truth in that?
I think quite probably.