On Tue, 10 Jan 2006 11:24:24 GMT, Matt Whiting wrote:

Ron Wanttaja wrote:

I have to admit he does bring up a good point. I have often wondered
what the difference in strength's and weakness would be if I used
different wood in my plane, or enlarged the components for a larger
pilot.


Which is probably one reasons designers don't provide the equations. Many hate
it when folks make changes.

Most equations for light airplane design are well established and have
been around for decades. What unique equations could a typical designer
provide?

Not the equations per se, but the precise values and the design margins of the
design in question, the non-designer's lack of understanding of the
interrelationships between design elements, and the legal implications of
*providing* the information.

Remember, the poster I responded to specifically referred to the substitution of
one material for another. It's sometimes more than a mere comparison of the
strengths of the materials.

Ron Wanttaja