Larry wrote- >I recall using urethane foam to build 211LF and it has passed the > 1000 hour mark. Why are builders not using it any more or are they?
I'm using the greenish urethane foam to build the tail surfaces and wings of my Flying Squirrel. I acquired an abandoned KR project some years ago and part of what came with it was a large stack of that foam, which back then could be ordered with a KR construction kit. You mention not to hot-wire it as one limitation to working with it but I would add another: the stuff is very unforgiving of being bumped, scratched, or bent, and it demands that it be sanded very gently. Once it's glassed, it's great- but the bare foam requires tender handling. You can sand it with anything, even with a chunk of itself, using very little pressure. Oscar Zuniga KR-1.5 N335KC Medford, OR
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