I was given a Kaos, thanks bro, that was partially covered but otherwise almost in ARF form. We are molding Dirty Birdys but I wanted to get everyone else’s out before I started mine (I haven't forgotten you David...eh!) but that left me with no plane for SPA so I moved the Kaos onto the table..
With no information I assumed the top of the fuselage was parallel with the thrust line so I'm using that as a datum to set the wings. I'm also assuming that the wings are set to 0*. There was a large gap between the TE of the wing and the back of the wing saddle of 3/8" or more so I made a plate to go over this area for the wing bolts. Is this normal?
Now the problem was when I mounted the wing it reads 0* but the tip had 2* of wash-IN. Well, horse pucky! I've made 1* or so of correction to uncovered wings but getting almost a 3* twist so I will end up with about 1/2* wash-out seems problematic in the future. I figured I'd share my experiences and maybe hear from some that have experienced this.
The photo shows the jig I set up. I used a long 'arm' so I would have more twisting action than actual weight; however the wing is bowed up towards the tip as well. I found the spot where the builder went awrie and stabilized from that point towards the root so only the tip would twist.
This is its fourth session in traction trying to train the wood and covering to stay where I want it. I heat the covering to take out the wrinkles after I twist it and after releasing I'm not getting anymore wrinkles so I'm getting close. The last check was still 1/2* wash-in so 1* to go then it should relax back to about 1/2*.
If this doesn’t work I will have to strip the wing, shape it, then recover it.