Making Helicopters?

Andy was working with me in the garage the other day, and he wanted me to help him build a helicopter. What he thought was a helicopter, was actually my Nordic Trac, that he was trying to nail a piece of plywood to, in order to make a helicopter. This was fine, I guess. Except that he kept insisting that I help him do it. Finally, I had to confess to him, that even though I seem to know everything, I did not know how to make a helicopter, especially using a Nordic Trac and a piece of plywood.