Thanks for the responses... its good to hear of Danny Livingstone's EPS
aircraft. Many of the responses related to cost or the sanding ability of this
material. You are correct, EPS is very difficult to sand to shape due to it's
make-up. I wouldn't think of trying to sand it to shape, however my interest in
it is for it's ability to be hot wired to final shape (without sanding), and the
weight of the finished product. It's cost is also not a major concern. The
fact it is a closed cell foam rather than an open cell, does not soak-up epoxy
like a sponge and that it is half the density of polyurethane was my concern. I
looked at Danny's web site it doesn't appear that his is flying yet. I had not
even considered doing my wings in EPS. For those of you that have not worked
with this stuff. A hot wire cut using good templates at the right temperature
leaves a surface nearly as smooth as a Formica counter top without sanding. The
only drawback is that compound curves cannot be made with a hotwire.
Polyurethane foam would need to be used in many areas of the KR2 for its
shapeability by sanding.
