Brian I constructed my wings in a similiar way using the factory parallel grooved Divinycell foam. It allowed the foam to be formed to shape with minimal shaping/sanding and has the benefit of an internal light glass layer that is easily sealed with resin prior to installation. My skins in crosssection resemble TTTTTTTTTTTTTTTTT and are very strong albeit a little heavier. Each wing finished without ailerons came to 55 pounds including tanks.
In my view, it is worth the extra money to buy good foam, like Divinycell. It doesn't collapse under finger print pressure or go to powder. Whatever foam you use seal it completely inside and out. John The Martindale Family 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA phone: 61 2 66584767 email: [email protected] > I have thought of taking something like a thin steel ruler and putting 1/4" > deep grooves in the foam
