BTW: I already mentioned this, but Bates Engineering requests that they
verify that your spar design by sending them output from the spar optimizer.
My application isn't a life or death situation, but the intended use of this
program IS. If I was thinking about building something that actually flew,
I think I'd opt for a proven design and construction method over something
designed by my inept engineering expertise. :-)

"tffy" wrote in message
ups.com...

http://www.continuo.com/marske/perfo...lculations.htm

I would suggest you grab a college-level structures textbook and make
sure you understand all the inputs that are used...