lamont:Guilty!
The other thing about the tank driving metaphor is that if you only do the forwards kick half of the helicopter turn you will act just like a tank with one tread going forwards and the other tread stopped and you'll turn in a circle rather than staying in one place.
This is why you commonly read reports of fundies or tech 1 / cave 1 where the instructor takes the students over a rock or other landmark and tells them to try to spin in place when they do helicopter turns. The problem is going to typically be that the back-kick part of the helicopter turn is weak or they're not doing it at all, so they turn around in a circle rather than spinning in place.
You have to have one tread going forwards and one tread going backwards at the same rate to spin in place.
This is what DATs (Dumb @$$ Tankers- I say it with affection) call a neutral steer.