Some wing progress

[Hank Jarrett]

Re: Some wing progress

This gets really confusing to a LOT of people but there is an easy check. When you put the wing together just twist the tip trailing edge UP a little on the table and see if the wires spread apart or get closer together (probably touching). You are REDUCING the tip angle of attack by twisting the wing tip TE up. It doesn't take a lot to see some significant spread or closing of the drag and anti-drag wires. When you REDUCE the tip angle of attack you want the wires to move FURTHER apart.

Don't feel bad if you get it backwards. I have seen some very experienced builders get it wrong. Also best to just hook up two wires in an easy bay to do the check. No sense having to re-do the whole wing if you can catch it early.

Hank

So for clarity, I think what you mean is the outboard end of each anti-drag wire will be slightly lower than the outboard of each drag wire when the wing has the correct wash-out incorporated. So the drag wires (wires extending from front I/B to rear O/B) end up on top of the anti-drag wires (wires from rear I/B to front O/B) in each bay. Yes?

[waltermrich]

Re: Some wing progress

Those wing parts look very nice, look like you put a lot of labor into them. I would not toss the the spars that you have they can be used in some fashion, lots of old spars are glued together.

[Scott]

Re: Some wing progress

PM me with the info on the stick rib info. Tim

Don't forget that the wing wires get positioned so they are trailing outboard down for the washout, its critical for them so they don't chafe. Tim

So for clarity, I think what you mean is the outboard end of each anti-drag wire will be slightly lower than the outboard of each drag wire when the wing has the correct wash-out incorporated. So the drag wires (wires extending from front I/B to rear O/B) end up on top of the anti-drag wires (wires from rear I/B to front O/B) in each bay. Yes?

[astjp2]

Re: Some wing progress

PM me with the info on the stick rib info. Tim

Don't forget that the wing wires get positioned so they are trailing outboard down for the washout, its critical for them so they don't chafe. Tim

[cbcfly]

I started the teardown of N96262 back in August. About 6 weeks ago I purchased another BC-12D project from a fellow in Texas - mainly because I wanted the C-85 and prop that came with it, but also some parts I thought I could use - including 4 spar blanks. Well, the blanks didn't turn out so hot after all. Two of the four had already been cut at one end, and the profile does not match a Tcraft - scratch those. A neighbor and I cut and planed two of the blanks to shape for the right wing. My IA took a close look and does not like the grain in these pieces - scratch them too. So... now I've got 4 blanks coming from Aircraft Spruce. They're supposed to ship out Dec 9.

In the meanwhile I've completely disassembled 3 wings now - my right wing, and the two from the project. One wing of the project had pre-war stick ribs, so I've got almost a complete wing's worth of stick ribs if anybody's interested. Most are useable. I've been straightening, repairing, cleaning and painting wing parts for the better part of two months now. Finally finished up today. Hopefully I'll have two new spars ready to go shortly, and in a couple of weeks get started building the right wing. Here's a few pics, included the box of stick ribs.

-Brian