Eagle II Wing Washout ?

Hello Everyone,

Twenty years ago I started a Carl Goldberg Eagle II and then stopped. I completed the woodwork on the wing and covered it with Coverite's, Super Coverite (fabric type). I did not have a flat, warp-free surface to work on and now I have a wing that is not exactly true.

In starting to finish the plane, as tested recently, with the wing root at 0° incidence, as it should be, the left wing tip is at -.25° and the right wing tip was at -2.75°. There should be no washout.

I have tried un-warping the right wing panel by re-shrinking the covering. That only got me 1.0°. It is now -1.75°.

The Eagle II is not supposed to have any washout. Do you think it wise to get the left wing tip to -1.75 as well, or work to get rid of the washout all together, as it should be ? Or will something else make more sense?

I built the wing as the trainer version with the most dihedral. If I built the wing today, I believe I would built I would build the sport version.

I Greatly Appreciate Any suggestions you might wish to offer,

Wayne R. Russ

Reply to
Wayne R. Russ
Loading thread data ...

That works out to only about 1/4". A little washout in a trainer is a good thing to have. Actually, a little washout, trainer or otherwise, is (or can be) good. You can trim out the slight inequity with the ailerons. I'd leave it as is.

Reshrinking the covering is probably just a temporary fix. When the plane sits in the sun, that covering will loosen slightly, possibly allowing the wing to retwist.

If the washout really bothers you, then rebuild the wing, this time as the sport version.

Dr.1 Driver "There's a Hun in the sun!"

Reply to
Dr1Driver

Dr. 1 Driver,

Thank You for the advice. Are you saying that there is enough trim to trim out the 1.5° difference between the two panels ? The right panel has already been twisted 1.0° from -2,75° to -1.75° by reshrinking the covering and might it twist back ?

If you think it will work as is I will leave it. The covering looks good. I am just not beyond doing the work if it needs to be done.

Reply to
Wayne R. Russ

Yeah, Wayne, there's plenty of trim. A typical trim tab will move a control surface approximately 5 deg. That's much more than enough to trim out that slight twist.

I'm not saying it absolutely will, but it certainly might, in hot weather. The sun can heat Monokote enough to relax it, but not enough to shrink it. It depends on the type of covering on your plane, too.

Based on 20+ years of building and covering, I'd leave it. It'll fly, and fly well.

Good luck.

Dr.1 Driver "There's a Hun in the sun!"

Reply to
Dr1Driver

Thank You Dr. 1 Driver,

Your advice is Truly Appreciated. I was getting ready to pull the covering off and do the work. I will take you advice of twenty years gladly. You have saved me from having to spend money for new covering as well.

Again Thank You,

Wayne R. Russ

Reply to
Wayne R. Russ

I would certainly fly it first before doing anything radical (that requires a lot of effort). You will probably find that it is okay, in the air. You want everything to be perfect, but sometimes you just have to settle for pretty good. I look at each project as a chance to get it perfect, but have never succeeded. Ad astra per aspira.

Reply to
John R. Agnew

Hi John,

You are right John, I am trying to make it perfect. I will try and take everyone's advice and leave it alone. Effort wasn't sounding too inviting any way. :-) My next plane will be better.

Thank You for the Advice,

Wayne R. Russ

Reply to
Wayne R. Russ

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.