"Terry Keeley" tkee(no wrote in message
...
Having the fin as thin as possible is the most important, then weight and
strength. Looks like a heat-treated Ti alloy is in fact the best choice,
other than some "unobtainium", LOL!

Thanks again for all your help, my goal is to travel our 330' course in
1.8 sec!

Well, good luck. Let us know how you do with it.

--
Ed Huntress