In the case of Blue & Spider foam, is it really necessary to have a vacuum pump capable of 18″ of vacuum, or is my “aquarium” pump capable of “getting the job done”?
A smaller pump should be adequate for blue foam. Do a dry run using only a wing core with mylar and breather, and see if the mylar pulls down tightly over the LE of the wing. If it does that reasonably well, you should be OK. (btw I use 0.25 mm mylar.) >3) Can someone please provide me with an idea of what weight of fiberglass to use on HLG, 2-meter, and 3 meter size wings < This is a difficult one. It depends on what foam you're using, what kind of durability you want, etc. A few examples: Chuckie wings (1.5m span), 16 kg(1 lb) white foam, 2 tows of 12K carbon tow spar - 2 layers of 1 oz., (1 at 0 degrees, 1 at 45 degrees). 3 meter (F3J), 3 piece wing (very light layup): - 24 kg white foam, strong CF spar system, centre panel has 2 layers 3 oz. (1 at 0 deg. 1 at 45 deg) + 1 layer 1oz (pinhole control). Tips are 1 layer 3 oz. + 1 layer 1 oz.
