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Rear wing mount universal fitting play? Tail shake?

 
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3benny3



Joined: 17 May 2017
Posts: 24
Location: Lenoir, NC

PostPosted: Sun Sep 22, 2019 6:13 pm    Post subject: Rear wing mount universal fitting play? Tail shake? Reply with quote

How much if any play (can pick up rear of wing by rear mount 1/4in) play is in the castle nut the bolts universal to the fuselage frame and from universal to wing. Another notch on the castle nut is too tight, while where it is, is to lose I believe. Thinking about using very thin washers to get a "half notch" on the nut. Anyone else have play here, if so how much?

On another note, seems like everyone's horizontal and vertical stab have some flutter/vibration in them. How much do you have if any and how much is ok? Anything you have done to help stabilize/stiffen this area?


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Richard Pike



Joined: 09 Jan 2006
Posts: 1579
Location: Blountville, Tennessee

PostPosted: Sun Sep 22, 2019 7:21 pm    Post subject: Re: Rear wing mount universal fitting play? Tail shake? Reply with quote

Not exactly sure of what your question is asking, but here are some things I have learned:
You can scrounge/create a very thin washer to put under your rear universal joint big castellated nut and get the play down to very minimal.
You can fit as many washers as you need around the fitting that comes out of the wing root rib & joins said universal fitting to take up virtually all the slack.
Keep fooling around with it, while mine is not totally tight, play is probably less than 1/16", and in flight, is unnoticeable.
If your tail cables are tight, flutter in the horizontal stab will be unnoticable. All Kolb vertical stabs/rudders have slow pulse flutter in them, if you take your feet off the rubber pedals the rudder will start to flap. So keep your feet on the pedals!
Or put a counterweight on your rudder similar to what Kolb sells for the ailerons. Like this:
http://oh2fly.net/oldpoops/pg6.htm


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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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3benny3



Joined: 17 May 2017
Posts: 24
Location: Lenoir, NC

PostPosted: Mon Sep 23, 2019 6:07 pm    Post subject: Re: Rear wing mount universal fitting play? Tail shake? Reply with quote

Yeah I think that mostly answers my questions. I don't really feel the play in the air, but anything that moves will wear or wear faster so I'd prefer it be right/tight. My wires are fairly tight and bolted as I never really fold it.

Universal play: https://photos.app.goo.gl/7jw5uTUmbRkyqAyR7


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Richard Pike



Joined: 09 Jan 2006
Posts: 1579
Location: Blountville, Tennessee

PostPosted: Tue Sep 24, 2019 5:02 am    Post subject: Re: Rear wing mount universal fitting play? Tail shake? Reply with quote

After watching your video, I checked the MKIII and the Firefly, the MKIII fittings move a little less than your video, one side of the Firefly just barely moves and the other side does not move at all.

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0

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R. Hankins



Joined: 18 Jan 2006
Posts: 184
Location: Grants Pass, Oregon

PostPosted: Mon Sep 30, 2019 10:54 am    Post subject: Re: Rear wing mount universal fitting play? Tail shake? Reply with quote

3benny3,
As far as I can tell from the video, the left side seems a little excessive. The right side seems fairly normal. As others have said, you can make a custom washer to take the slop out. You will find that it will still fold just fine if it is pretty tight and well lubricated. I have many hours with varying degrees of looseness in those fittings with no ill effects. I check it on preflight but have only adjusted out the slop twice in 700hrs. I fold every time I fly.

If you think about it, that fitting is always loaded in one direction when flying unless you are pulling negative g, or in really turbulent conditions. It will get the most wear taxiing on rough ground.


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