> We are building a Sidewinder (Estes) and after following the posts,
> decided to use plywood for fins. Would 3/32 ply be ok for the sub for
> balsa? as well as balsa strips along the ply fins in place of
> cardboard? Intend to use a c-6-5 for first flight, as all the posts
> about near crashes with A's and B's so what altitude would I be
> looking at? Is a 12" chute to small? We don't have lots of area, but
> have lots of trees. We have launched others and had no problems, but
> don't want a ground level para discharge.
motor. It really wants a D12. Before substituting ply (and basswood
would be a lighter, better choice than plywood), I would first suggest
you investigate covering the fins with Jap tissue. If you have access to
a flying model airplanes (ie: R/C) store, they will sell Jap Tissue, Sig
Lite clear dope and Sig Thinner.
1. sand and shape fins
2. Apply one coat of 50/50 Sig Lite and thinner to fins. Let dry. Don't
coat fin root.
3. Cut out tissue a little bigger than fins all the way around. Cut
tissue for both sides of fins.
4. Lay tissue on one side of fin. Brush on full strength Sig Lite,
enough to fully soak tissue. Allow to dry. Trim off excess tissue with a
single edged razor.
5. Repeat for other side of fin, but don't trim off excess. Trim only
enough to leave ability to wrap around fin edges (except root) plus 1/4"
overlap with tissue on other side. Wrap around and dope that on.
6. If you insist on substituting for the balsa fins, use 1/16" basswood.
You'll be surprised at the strength of the tissued fins. You won't need
to replace the cardboard. And there is very little weight gain. Even
basswood is a lot heavier than balsa, and plywood is heavier than