I am putting together an ARTF kit, of an extra 300 sport/aerobatic plane with around 36" wingspan (brushless electric powered).

The kit seems pretty cheap and nasty, and not very well put together. Both wing halves were pre-covered and required me to join them.

The problem is after doing so and putting them against a straight edge, they seem very uneven. Looking at them from the leading edge, the right hand wing bends gradually downwards towards the tip. At the very tip it is between 1/4 and half an inch off "straight". The left hand wing is slightly the opposite. It has a bend going the other way. Around the center of this wing, it's bowed downwards by about 2mm, then the tip curves back up slightly.

I also have noticed that the right hand wing appears to be warped, the tip seems to have a slightly higher angle of attack than the root.

I know this won't be possible to give a very definitive answer on.. but what I'd like to get some opinions on please is whether the plane will have odd flight characteristics (if it flies at all).

I need to know whether it's worth continuing the build (the plan was to ship it overseas to a friend which won't be too cheap, hence if it won't fly I want to cut the losses now)

Given that it's a sport/aerobatic plane, I assume it's aerodynamic accuracy is more important than on a slow park flyer or high wing trainer for example. I'd just really like to know whether it's going to be worth completing, or whether to cut my losses now and pick up a better quality model.

Thanks very much for any advice.

Unless there's a way to straighten out the wings, it's a lost cause.

Thanks, so in a nutshell you're saying that much bend/warp is too much?

Thanks again!

If the wing can't be straightened using a heat gun to loosen the film, twist out the warps/bends, and let it cool to the new position it's a lost cause.
It might be possible to get replacement wings from the manufacturer...

On open bay construction wings, the covering is a major structural member and warps can be removed by twisting the wing in the opposite direction while heating the covering with a heat gun.
On D-tube wings, warps built into the wing are in there for good. One way to unwarp a D-tube is to unglue the sheer webbing on either the top or bottom, not both, there is no need to completely remove them. Now the wing will be quite flexible and easy to twist. Jig it straight and reglue the sheer webbing to the spars. Now the wing is quite rigid. Recover the wings.
Slight bends in the wing are not as serious as twist is. I wouldn't loose sleep over a slightly bowed wing, especially if it's mission is sport flying.

I moved your thread to ARF's as this is more about a repair and quality issue.

If you find that the stock covering is not heat shrinkable so that you can correct the twist at least then I'd suggest stripping off the covering and use steam from a madly boiling kettle to bend and twist the bare wood wing back to straight in every regard. Let sit for a couple of days and re-do the steam bit if needed. Once it stays straight for at least two days then recover with some proper shinkable covering and use the iron to straighten and de-warp as required using the iron to heat stetch and shrink as needed.