Edge wing assembly

[bills]

Here is something I don't see on another thread anywhere... I assembled the wing of my new Edge today, following the directions carefully. The spar went together easily and when finished was close to straight. After a dry fit I glued up the upper and lower flanges of half of the I beam, slide it through the left wing and rolled it into place. A straight edge longer than the wing half helped to straighten the I beam inside the wing and align it to the marks. I put a couple of clamps on with just enough pressure to keep things from moving around and left it to dry. After a couple of hours working on the tail feathers I repeated the process with the right side. All went well again. After the glue set I removed the clamps and to my surprise my wing has a gracefully curve in it. Stretching a string from wing tip to wing tip its about a quarter inch at the joint. The question is, which way should I install this wing in the plane? Wing tips high will give it a little dihedral, easier to fly but what happens to performance? I have no idea the effects low wing tips would have. Any ideas out there?

[king160woody]

UHH... I didn't even check mine for dihedral, positive or negative, but i would have wing tips high if anything.

Jordan

[bills]

Thanks Jordan, that was my guess.

Bill

[paulg]

I doubt you will notice it in the air, but I have not seen that one before. Let us know how it works out.

[3DX Jim]

Some cool anhiedral would be neat to see! (anhedral is the reverse of diehedral)

[bills]

First flight today. Wing tips installed up for dihedral. What a kick in the pants and I'm only using 30% on the dual rates. The other planes are going to gather dust for a while.

bills

[paulg]

LOL, yep that is usually what happends.

[Gary Hoorn]

bills,
The spar went together easily and when finished was close to straight.
Check your building board where you assembled the spar. I discarded a wing building board after a few years as it developed a slight warp.
Gary

[bills]

Thanks Gary.
I am fairly new to this sport/hobby, just over a year, so have up to now only purchased ARF aircraft and don't yet have a building board. I pretty much built the spar as the manual shows. The spar was really quite straight horizontally but did have a minor "s" shape looking from the top down but I removed that with a straight edge before I clamped the glued wing half. The curve seemed to develop after gluing. My guess is that I did not have the top and bottom wing halves pulled together equally or spraying water over the bead of Gorilla Glue dampened the balsa enough to cause some of the curve, or some of both. Any way...all's well that ends well. I couldn't be happier in how it turned out.
Bill

[paulg]

Not all that cridical, the important point is that the spar has no crwon in it.

[bighead93]

It appears that my kit is doing the same thing! I built the spares using a 3' straight edge but now that I have assembled everything (I-beam) it appears to be slighty curved up...maybe 1/8". Advice? Should I keep building? Or would I be better taking the spare apart and try again?

[paulg]

1/8" is not enoght to worry about.

[bighead93]

Not all that cridical, the important point is that the spar has no crwon in it.

A crown would be left to right curve, not up and down? My I-beam...even after 3 days clamped down to a straight piece of steel it still curves up...about 1/8th". I am going to contiune the build...I will let you know how it comes out!

[tdarst]

A crown would be left to right curve, not up and down? My I-beam...even after 3 days clamped down to a straight piece of steel it still curves up...about 1/8th". I am going to contiune the build...I will let you know how it comes out!

My first wing came out as straight as an arrow. However, after assembling the spar, it had a slight slight curve (don't recall which direction). I used a very thin layer of 30 minute expoy to put it in the wing... and as soon as I had it all in position, I laid the wing on a flat surface and covered with with 3.5" to 4" thick telephone books, end to end, "balanced" on the spar. I let it site there for about 4 hours before moving it. When I did check it, it was flat, flat, FLAT!

I have two more here to build... I suppose I will find out if it was luck, or if the technique has merits.

TD

[banditt]

Never heard that term before. Sounds interesting for sure;)

""Some cool anhiedral would be neat to see! (anhedral is the reverse of diehedral)""

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