Yeah I see what your saying. A big typo there. I should have wrote:</p>

(#2) a wing in flight under dynamic loads arent fully comparable to a static truss with a single load.</p>

I dont disagree at all that the spar asm. isnt a truss. Ive read about wings folding because webs were accidentally omitted during construction.</p>

I believe if someone where to look at the FBD's given prior and then think about  a FBD showing rotational forces normal to the spar that the argument for webs with grain normal to the spars will still hold for my less than perfect wings with "designed in" shear cracks.</p>

I think you get the best of both worlds. OK truss strength with the rotational forces normal to the fuse and then good strength with the rotational forces normal to the spar/truss. With rotational forces normal to the truss and the web grain normal to the spar, the webs are probably at full effeicency in compression and tension.</p>

Fun stuff.</p>