I took the doors off for my first flight (IV). It was really hot that day. I didn't want the doors flopping around up on a first flight either. I'm glad I did it that way as it made the plane a bit draggy which helped get it slowed down on approach. The plane likes to sail on and on it if you come in a tad fast. Mild slips at slow speed were no problem but you get some wind rumbling obviously.