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Rick Lewis
Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.
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 Posted: Tue Jan 13, 2009 4:22 pm Post subject: MK3X Aileron Cable Bracket Misalignment |
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This picture shows what can happen if you build the ailerons exactly as shown in the plans. The MK3X uses a cable to move the ailerons and there is a 90 degree bracket in the wing where the cable bolts to. This cable needs to be in good alignment with the bell crank on the aileron. This bell crank is attached to the middle rib on the aileron. If you build the aileron up as shown in the plans you will end up with a problem as shown in the picture. The fix is to mount the 90 degree bracket on standoffs, install another rib next to the one shown or DON'T put this rib in place until after your ready to align the cable hook up. BUMMER 
Rick Lewis
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Rick Lewis
Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.
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| Posted: Sat Jan 17, 2009 5:54 am Post subject: Re: MK3X Aileron Cable Bracket Misalignment |
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Here is my fix for the problem. This actually turned out to be an excellent way to precisely align the cable. The spacer is 1.25x1.25 aluminum tubing
Rick Lewis
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NeilsenRM(at)comcast.net
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| Posted: Sat Jan 17, 2009 9:17 am Post subject: MK3X Aileron Cable Bracket Misalignment |
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Rick
You are one of the first to use the new wing design and as happens these
bugs get worked out by.... you.
I have some concerns about your fix. My pet peeve is weight. I was a
stickler about the little things. A bunch of little weight savings add up to
real savings. Your fix adds weight.
The second is a minor concern about the stress this stand off would add to
the cable bracket mount in the wing. It was designed to handle the load of
aileron deflection bolted directly to the mount. Your stand off would add a
leverage arm to that load maybe overloading or flexing the mount. I can't
see much about how it is made and I can't see if you had added a gusset to
carry the additional flexing load.
Is there any way you could move the mount to align with the bell crank?
Again I can't see how it is attached or what it is attached to.
As always, the advice is worth what you paid for it.
Rick Neilsen
Redrive VW powered MKIIIC
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Rick Lewis
Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.
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| Posted: Sat Jan 17, 2009 2:53 pm Post subject: Re: MK3X Aileron Cable Bracket Misalignment |
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Rick
The stand off is a piece of 1.25x1.25 piece of square tubing there fore the lever arm, your talking about, is only 1.25". I believe this is a good fix and will not cause any problems. As far as adding weight, well your right but not much I can do about it in this case. The rib in the aileron was already riveted in place by the time I got to this stage. If I had only know this was going to happen, I would have waited to put this rib in place and moved it where it really needed to be. I'm hoping that future builders will take note of this. I like this kind of feedback it keeps me on my toes and is appreciated. Talking about weights, I'm about to post the weight added by those lovely wing tips and fiberglass tub seat. I try to watch my weights also, you just have to, little things sure do add up as a whole.
Rick Lewis
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