Bill: That makes sense as the momentof inertia goes up to the 3rd power of the depth of section (b x h cubed)/12. 8 cubed is 512 vs 7 cubed which which is only 343 so the spar is much stronger so in can probably handle the added bending moment. I know the basics but it would take a good aero structure engineer to really to a thorough analysis.
Don ------------------------------------------------------------------------ [email protected] wrote: > Thanks for the info on spar wood guys. For those interested, I do need a > center spar length that is 2 feet longer than normal. The 18% chord AS > airfoil will improve the strength and load bearing necessary for my project. > The > Taller spar is about 20% stronger than the stock spar which will be necessary > because the airplane I am designing is about 250 lbs heavier than my 2S. > Instead of foam/glass on the center stub wings I am probably going to be > using > wood ribs and ply on the surfaces. It will be comperable in weight but > stronger. The ribs may also be made out of Nomex - a carbon honeycomb > material > that is extremely strong and light. Many ideas but they are still on the > drawing board. This will be custom built and a true experiment. More info > to be > coming...... > > > Bill and 41768 > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html
