Heard about this and understand the concept.
How do you do it, though?
Specifically, how to "blow up"a print of a regular rib, rules for amount of trusses, is 45 degrees essential, what about center of wing and bell crank area, etc?
Is there a place to turn to for information?
Thanks
John Park
AMA 29443
Flint MI

Well, if Randy doesn't know, then I guess I don't feel so bad.

I assume you mean a wing that has diagonal ribs meeting at the LE and TE?  Or do you mean a wing that has chordwise ribs with diagonals in between?

At any rate, if the chord is constant then you just draw a rib with the desired thickness and a length that gets you from point A on the LE to point B on the TE.

If the wing is tapered then you do the same thing, except that you need to measure or calculate all your rib lengths individually.  If you're going with all diagonal ribs, and you don't mind the angles not matching up quite, you can use evenly tapered ribs and just stick them where they fit.  No matter what, unless you are a numero-uno computer whiz, it's probably sensible to plan on cutting the ribs a bit oversize and plan on sanding the wing to shape with a long bar sander.

There's no magic in 45 degrees.

I'm not sure what you mean by "amount of trusses", but if you mean "number of ribs" then your biggest problem is going to be covering sag, so eyeball things, decide how much sag you can live with, and go.  I'd be inclined (if I did this at all) to use straight ribs from spar to LE, and a truss in back.  You lose some strength, but you ribs where you need 'em to reduce covering sag.

ill be doing somthing like that for my fancher twister. what keeps the rod from falling through the wing?