If you want to build a 90 size ship, 78" is too much wing. For really good vertical performance on a 90 2 stroke or 90-110 4 stroke you need to stay around 7.5lbs AUW. Look at current designs for ideas on size. The Boxer 90 has a 65" span (I think) and 820 sq.in. and a target weight under 8lb. This is a reasonable area to be in. If you want to fly it on the wing instead of massive power, your wing should be OK. But it will probably be heavy and not have really killer vertical.

Yes, they are all symmetrical. Typically, the planes are set at 0degrees and the angle of attack is introduced in the plane's attitude in the air. Depends on the model, though, they do vary.

Yes, the thinner foils are lower drag (as is the N-64, which is a laminar flow section) and typically stall harder. A fair number of current 2M planes start with about a 10% section at the root and taper to 8.5-9% at the tip, to promote tip stall for the spinning and snapping maneuvers.

If you are still learning, I would say you are better off buying a proven kit and practicing a lot instead of tinkering with an unknown design. If your goal is to simply fly your own plane, then go ahead. But it will be more cost and time effective to buy a proven design and build it straight and light... I understand your desire, I have designed and scratch built a number of my own planes and enjoy it tremendously. But it is not the best way to get a really good pattern plane. If you like scratch building (as I do), then buy plans for one of the Boxer series and go to it. If kits are OK, the CA Models Widebody 60 and Epsilon 90 have a great reputation and are not too expensive.


Mark