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king cat wings problem

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Old 11-07-2018, 10:34 AM
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ravewithmein
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Exclamation king cat wings problem

Hello,
Am the third owner of this king cat and I have an issue with the wing, Am having a 1.5 mm gap between the wing and the rudder is this normal or am missing something ?
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Old 11-07-2018, 11:28 AM
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Dave Wilshere
 
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You mean the wing and boom. Misalignment on KC wings is not unusual, depends on when it was made and who put the tube in.
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Old 11-07-2018, 11:42 AM
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I think it gets worse over time, on bobcats I put pins in the leading edge of the wings, otherwide I get big roll excusions on high g pulls.

Make sure the bollts still go into the wing block and spar tube cleanly the holes may have wallowed out
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Old 11-07-2018, 02:57 PM
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Originally Posted by mr_matt View Post
I think it gets worse over time, on bobcats I put pins in the leading edge of the wings, otherwide I get big roll excusions on high g pulls.

Make sure the bollts still go into the wing block and spar tube cleanly the holes may have wallowed out
Yes, I would suggest that you take the wing bolts out and see if the wing will slide on flush. If it does, then you need to replace the carbon fiber strap that holds the wing on with a new one, and/or redrill it so that the wings are snug when the bolt is in.

There was a problem with the Kingcat wings going all the way on in front, but leaving a 1/8" to 1/4" gap in back. This was due to a jig alignment problem when the wings were built. There was an AD that dealt with that, but it could also happen if you did install the booms correctly. On two of the Kingcats I built, I had to sand the front of the wing down a bit so that the wing would snug up straight against the booms...

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Old 11-08-2018, 11:31 AM
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ravewithmein
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Thanks for your comments,
I have rechecked the tube and it look pretty good, but on my left wind its off 1.5 mm from the front and its flush from the back, on right wind its flush from the front and 1.5 mm off from the back!!!!!!! with out the wing bolts.
what am thing now is to sand off the boom for each side of the wing or any suggestions?

Thanks

Al
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Old 11-08-2018, 02:32 PM
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Originally Posted by ravewithmein View Post
Thanks for your comments,
I have rechecked the tube and it look pretty good, but on my left wind its off 1.5 mm from the front and its flush from the back, on right wind its flush from the front and 1.5 mm off from the back!!!!!!! with out the wing bolts.
what am thing now is to sand off the boom for each side of the wing or any suggestions?

Thanks

Al
No, do not sand the booms. The booms are designed to be just strong enough to do the job and any modification will weaken them.

If you do any sanding to make the wings flush, do it on the root of the wing. I had to sand off a little more than 1/8" on the wing root towards the front to make the ones I built fit. The root rib is usually set back a bit from the edge of the wing, so you can sand off some of the fiberglass of the wing skins without getting into the root rib. If you need to, you can add a Hysol bead in the back of the root rib between it and the wing skin for strengthening, but even that's typically not necessary.

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Old 11-08-2018, 03:41 PM
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I had a similar gap on the KC I picked up too. As the front had been sanded almost back to the root I just made balsa spacers, glassed and painted them.







Last edited by Jeremy_D; 11-08-2018 at 03:59 PM.
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Old 11-09-2018, 02:11 PM
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Like your idea Jeremy D, Perfect will do that.

Thank you
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