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Old 02-13-2009, 11:07 AM   #11
Mike Emilio
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Re: Washout Problem

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Originally Posted by Terry Gauvin View Post
I certainly wouldn't do anything until I built the second wing. 1 degree of washout rather than 2 will be of little consequence to you, the most important thing is that you have some washout and you do. The next thing to focus on is getting both wings the same, spend your time on the second wing and see what you end up with before even considering attempting to mess with the first one. If you end up with 1 degree on both wings then cover them and go fly.
This is what you should do as the first option.
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Old 02-13-2009, 12:28 PM   #12
homme de fer
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Re: Washout Problem

Originally Posted by Mike Emilio View Post
This is what you should do as the first option.
And so I will start the left wing tonight and see what happens. If they both come out to 1 degree of washout, great. I will cover them and induce a little more washout by twisting and tightening the cover.

It may not come out to exactly 2 degrees but I should get close enough.

Thanks for the help.

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Old 02-13-2009, 04:22 PM   #13
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Re: Washout Problem

It's much more important that the amount of wash-out be the same between the two halves of the wing, than the total amount that there is. In real terms, with all of the inaccuracies of real life, the difference between one and two degrees of wash-out will not matter. Just make both wings the same, this is critical to a smooth flying plane that can be properly trimmed out. When you have both wing halves done, you can sand, into the leading edge, a change in the placement of the actual edge. That is, you can sand the edge higher at the root than the tip to give aerodynamic washout.
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Old 02-14-2009, 10:01 AM   #14
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Re: Washout Problem

Like the man said build the other wing to match and do not try to change them. Wash out is used on real A/C to make the tips stall last and has very little effect on the lightly loaded model A/C wings. The more washout the more chance of your outside loops turning in to a spiral. So long as both wings are the same leave them alone.

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Old 02-14-2009, 01:56 PM   #15
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Re: Washout Problem

Thanks guys.

I actually think the incidence on the right wing may be 0 because I was measuring from the wing's trailing edge and not the aeleron trailing edge (which haven't been built yet). This being a semi symetrical wing, the addition of the aeleron will probably drop the washout to 0 or worse.

I started building the second wing and it is going much easier than the first. The right wing was really difficult to keep pressed against the washout jig while this one has been a pleasure; so much so that in about 3 hours of work, I have almost completed the wing (less the sheeting). The first wing took me about a week to get to this step.

Anyhow, I will finish the left wing and measure the washout. Then, I will bend the right wing to match using the steam method.

I'll let you guys know how it turns out.


PS. post mortem indicates that the ribs fit into the spar too tightly on the right wing, probably inducing an unfavourable twist. This is probably why the wing seemed to twist back to neutral washout whenever I took the weight off the top of the wing. On the left wing, I sanded the spar slots in the ribs so they fit a little easier (though not loose). Now, the wing stays pressed against the washout jig regardless of whether I have weight on it or not. Lesson learned.
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