Hello!
I want to build a simple soarer,too,but in Germany dollartree foamboard is not available.
Now i want to build the wing with 3mm depron and the fuselage with 6mm one.I dont want to build the wing with 6mm depron,because i tried it on the ft versa and it didnt work so well,because the 6mm one is very fragile on the cuts in the wing.The glue cant hold it really strong together.And the 3mm one could be bent without cutting in it.I would add a carbon spar into the wings of course.
do you think that it works and that its nit so fragile?
Thanks in advance!
The foam itself doesn't make that huge of a difference. It's the fact that foamboard is covered with paper. That keeps the foam from ripping open on the outside of the bend, crushing it on the inside instead. if you want depron to go around a tight bend you need to reinforce the outside of your bend with tape before you start bending. You can help the foam along by running a pizza cutter along the intended bend line.
You can probably cover the whole outer surface with packing tape and still save weight in respect to DT foamboard.
I bought a couple of different kinds of paper backed foamboard at a local .
(german) art supply store to compare weight and stability. (I've yet got to get around to that.) What all the available foam boards have in common, though ist that they're more expensive than depron. I want to try and compare them to depron covered in DeCeFix vinyl (available at OBI, among others.)
I hope this encourages you to experiment a little, so we can share experiences.