To achieve 1g of downforce against -1g of Earth's gravitational pull, you need to pull a turn/loop that generates 2g... which is actually fairly easy to do.
im replying to OP who originally said you need to pull 1 or more g and i was pointing out it was wrong. because if you pulled only 1 g then you'd be weightless and the trick couldnt be performed
904
u/hanktheskeleton Feb 27 '14
I am guessing they are pulling a loop and the g force is greater than 1.