internal structures....

[Arbo]

Ok, now that I have far too much on my plate, I have gone back to re-designing my commercial jet to be constructed of wood rather than foam. I just have a question of sorts....

The biggest 'delema' that I am having is how to do the center piece that joins the wings as well has the attachment points for the fuse. I have worked up some stuff in cad, and printed them up in itty-bitty scale and used 1/32 balsa to test fit a bit... the formers would be 1/8 lite ply, the center piece that fits in like a key would be 1/8 balsa as are the side airfoil shapes (which provide a surface for glue)...

What I'm looking for is someone that may have the knowledge to tell me if this assembly will be strong enough.

Here's other data to go on, the w/s is about 69 inches, so a full length carbon spar will be in the wing. Depending on setup, it will need to support a 5 to 7 lb load... comments/suggestions?

Thanks
Paul

[Sparky Paul]

Maybe a chord-length more on the dihedral braces to get the support the center section needs.
A thick wing is usually strong just because it's thick.

[Haldor]

I think Sparky's advice is sound, let the spar run atleast 2 ribs into the wing.