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Wing warp, Sig Spacewalker
Does anyone have ideas on taking out wing warps? The left wing is warped bad enough that it is causing me severe trim issues. I have heard of spraying the balsa with water and weighing it down with sandbags.
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Figure out how it is warped, and tighten the covering on the opposite side of the warp. If you covered with a shrink covering, like Monokote, you tighten the covering too tight on the first side too much before covering the other side. The covering shouldn’t be tighten up until both sides are covered. I would recover the wing. After taking the covering off, you will see the true warp if there’s one. Otherwise, how were you going to get it wet inside? Filled the wing with water? That isn’t good for the glue. |
The Spacewalker has a very robust wing construction with “D” tubes front and back. If it is warped, I doubt you could twist it out with covering. Might have to deconstruct it by removing some of the sheeting, straighten and add the sheeting back before recovering. Not that hard, just a nuisance project and time consuming. |
By using a mist and spray the joints. I don't know, I read it on the internet, so it must be true! Stupid idea I know.
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I think someone hung this model in the garage for a long time with the wings on and using straps. I think it is going to be a real pain in the you know what to repair this. I like your idea. It is not monokote on this model, it is fabric and painted, a very beautiful paint job I might add. I will have to make a decision whether or not I want to spend the time on it. I came with an awesome Saito 300. What a great sound! Maybe put the engine in a Cub.
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I hear and understand your frustration. I don’t think that you can spray the joints, since the joints are under water proof fabric. If it is silk and dope, there isn’t much that can be done. If it is an iron on fabric, then the tightest side could be removed. It is pulling the frame. If the plane is sentimental, then it would be worth the effort. If not, hang for decorations. We’ve all had pretty planes that didn’t fly right and just hung them. It isn’t right to sell the problem to some one else. |
Originally Posted by RCFlyerDan
(Post 12554290)
I hear and understand your frustration. I don’t think that you can spray the joints, since the joints are under water proof fabric. If it is silk and dope, there isn’t much that can be done. If it is an iron on fabric, then the tightest side could be removed. It is pulling the frame. If the plane is sentimental, then it would be worth the effort. If not, hang for decorations. We’ve all had pretty planes that didn’t fly right and just hung them. It isn’t right to sell the problem to some one else. |
Unfortunately, with a D-tube construction, the warp is locked in to the wing. Only deconstruction can unlock it and that means removing the sheeting forward of the spar. Not what you want to hear, but it can be fixed with a lot of work. The question is, do you want to invest the time and effort or just move on to another project.
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Originally Posted by retransit
(Post 12554432)
Unfortunately, with a D-tube construction, the warp is locked in to the wing. Only deconstruction can unlock it and that means removing the sheeting forward of the spar. Not what you want to hear, but it can be fixed with a lot of work. The question is, do you want to invest the time and effort or just move on to another project.
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Try this:
Strap the entire plane down in a Robart super stand or something like it. Put an incidence meter on the root of the left wing half. Put a second one on the tip and compare the readings. Make sure your ailerons are straight when you do this. Unless the plane has some washout built in or it's the warped one, they should be the same. Now take the second incidence meter off and compare readings to the first one at the root and tip of the right wing half. By now you should know which half is warped. Also, the root reading on both wing halves should be pretty much the same but you never know. Put the second incidence meter on the wing tip of the warped wing. Have a friend hold that wing and gently twist it while watching the incidence meter. He should warp the wing a couple of degrees beyond the number you ultimately want and hold it there. Now you take a heat gun and heat the covering, top and bottom all over while he's holding that twist (yes, I know it's painted and not monokoted, what have you got to lose?). After you've heated it some, stop and have him continue to hold for a bit longer until the wing is cooled. Then he gently lets off the twist and you see where the incidence went. You may need to do this a few times until you get it right. You also may need to do both wing halves. It's a trial and error thing. If it doesn't work, you can adjust for the warp by moving your ailerons up/down as necessary. If it's so bad the thing flies like a pretzel, scrap out the wing and build another. SIG probably sells a wing kit. I know they do for other models. Carl |
Originally Posted by carlgrover
(Post 12555732)
Try this:
Strap the entire plane down in a Robart super stand or something like it. Put an incidence meter on the root of the left wing half. Put a second one on the tip and compare the readings. Make sure your ailerons are straight when you do this. Unless the plane has some washout built in or it's the warped one, they should be the same. Now take the second incidence meter off and compare readings to the first one at the root and tip of the right wing half. By now you should know which half is warped. Also, the root reading on both wing halves should be pretty much the same but you never know. Put the second incidence meter on the wing tip of the warped wing. Have a friend hold that wing and gently twist it while watching the incidence meter. He should warp the wing a couple of degrees beyond the number you ultimately want and hold it there. Now you take a heat gun and heat the covering, top and bottom all over while he's holding that twist (yes, I know it's painted and not monokoted, what have you got to lose?). After you've heated it some, stop and have him continue to hold for a bit longer until the wing is cooled. Then he gently lets off the twist and you see where the incidence went. You may need to do this a few times until you get it right. You also may need to do both wing halves. It's a trial and error thing. If it doesn't work, you can adjust for the warp by moving your ailerons up/down as necessary. If it's so bad the thing flies like a pretzel, scrap out the wing and build another. SIG probably sells a wing kit. I know they do for other models. Carl https://cimg3.ibsrv.net/gimg/www.rcu...c5eb1240e1.jpg |
Wow. Gorgeous. Would be a shame to have to scrap that wing.
carl |
Originally Posted by carlgrover
(Post 12556684)
Wow. Gorgeous. Would be a shame to have to scrap that wing.
carl |
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