Don't mean to ignore gravity, if you are trying to do knife edge it is a big force. But it is in the Y axis of the airplane, along the wing. Assume you control the roll to 90 degrees with no rudder input.

Paul, one time when I was at the Byron Expo I saw a J3 knife edged, I think it was flown by Don Lowe but won't swear to it in a court of law.

Say FHHuber, what is your first name? I can't wait to see the article. I love reading the old magazines. At Purdue in the stacks were bound volumes of Air Trails (I think that was the magazine). Anyway I would read them instead of studying. Grades showed that too!