R R ALWAYS said not to increase the wing length. The
spar is designed for just what you have, no more, Virg
The Leonards wrote:
> Mark
> Interesting to read about your wing extensions. I am wondering what
> you are doing about the extra bending moment and shear they will create.
>
> If my calculations are correct (assuming no increase in your AUW, 1200lbs)
> Your Bending moment will go from 68,000 inch pounds to 93,500 inch pounds.
> And the shear will go from 1858lbs to 2180lbs. From your e-mail below it
> also sounds like you're increasing the AUW. If so then these figures will
> increase even further.
>
> Eg if you increase the AUW to 1300lbs (an extra)100lbs the BM goes to 101350
> inch pounds and shear to 2362lbs
>
> You must be careful with wing extensions as they increase the bending moment
> at the wing root significantly. Also consider the extra load it will put on
> the wing attachment fittings.
>
> I'm curious to know if you plan on beefing up the spar or wing attach
> fittings.
>
> Regards
> Peter Leonard
> Brisbane, Australia
>
