Sherman wrote: > Also, I tore apart the water damaged wing that came from my bird, and found > the foam to be Like florist's foam. It is green, and open celled. Where do I > get this kind of stuff in sheets? Wicks only shows a cream colored foam.
The plans call for 2 pound (per cubic foot) urethane foam, which is sold by both Wicks and Aircraft Spruce. It comes in various colors, but most of it that I've seen is either pink or a yellowish tan. It is very similar (if not identical) to the green florist foam. My KR2S is made up of some pink and some yellow. I've seen no difference in the sanding (or other) qualities of different colored 2 pound urethane foam. I think the rubbery stuff is isocyanurate (I'm pretty sure that's not spelled right), and it is a pain to deal with. Definitely don't bother with it. It tears rather than sands. You can also use something very similar called Trymer 2000 (or some other number), which is made for the construction industry and comes in huge 4' x 8' x 2' "buns" of urethane. It is considerably cheaper than what the aircraft guys charge, comes in much larger and thicker sheets, and can probably be bought locally from an insulation place, saving on shipping. Some guys have picked up the leftovers out of the dumpster for free. The stuff works just fine. Some folks have used Styrofoam, but it takes considerably longer to sand to shape, and gasoline dissolves it on contact. Mark Langford, Huntsville, AL N56ML at hiwaay.net see KR2S project N56ML at http://home.hiwaay.net/~langford
