RE: Sheeting Foam Wings question
The vacuum "system" is simply a vacuum pump. I bought mine from a neighbor. A new one is usually over $100 but if you can find a used one they can be had for cheap. Then you just need some plastic tubing and a sheet of plastic (like a dropcloth sold at the discount store). Fold the drop cloth in half and seal the other three sides with a sealant (i use either tape or sometimes a cheap caulk). Also, most vacuum pumps have "too much" vacuum, so you need a regulator that goes between the pump and the bag. If too much vacuum, it will crush the wing. There's no using a vacuum pump for built-up balsa wings.