Horizontal stabalizer 90 degrees to vertical stabalizer

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Horizontal stabalizer 90 degrees to vertical stabalizer

Postby Tralika » Wed Apr 23, 2014 2:25 pm

I've installed my horizontal stabilizer and am now in the process of fitting the flying wires. (Chapter 1.10 Step 7) The manual says to measure from a point on the top of the fin to identical marks on the horizontal stab spar tubes, both of those marks being equal distance from the center of the stab. So I made marks stab spar tube at equal distance from the center and I measured. My problem is I don't understand how this makes the horizontal stab 90 degrees to the vertical stab. It looks to me like the angle of both sides of the horizontal stab will be equal but how do I know the angle is 90 degrees? I admit I'm not burdened with a great deal of knowledge of trigonometry but this just doesn't seem to pass the "that don't look right" test.

Wouldn't it make more sense to set the airframe up level and plumb (it is) check the vertical stabilizer with a level to make sure it is plumb (it is) and then put a level on the horizontal stab spar tubes and adjust each side until level?

If you've been through this and have some insight I'd appreciate hearing it.

John N.
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Re: Horizontal stabalizer 90 degrees to vertical stabalizer

Postby Familyflyer » Wed Apr 23, 2014 3:23 pm

I leveled the fuse with a smart level, made sure the vertical stab was 90 and then set the horizontal stab. All done with the smart level. You want to make sure you do not introduce any twist as well. Once done I then measured for a cross check. Your idea should be fine.
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Re: Horizontal stabalizer 90 degrees to vertical stabalizer

Postby Strasnuts » Wed Apr 23, 2014 5:35 pm

Same as Troy but used laser level. Leveled fuse and then set cross hairs on horizontal and vertical stabs. I bent mine into position so flying wires weren't pulling harder from one side.
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Re: Horizontal stabalizer 90 degrees to vertical stabalizer

Postby User GDS » Thu Apr 24, 2014 9:13 am

I concur, level the airframe then use a level to set level and plumb.

Over time, my cables have gotten some slack and I have had to remove washers from under the tabs. (I think the tabs twist and straighten out, and the cable loops flatten out a little, I don't detect any slippage at the swage) If I were doing it again, I would add an extra thin washer to each side of system so I had more room to take up slack. I would also eliminate the shrink wrap over the swage, it's not pretty but makes pre-flight inspection more complete.
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Re: Horizontal stabalizer 90 degrees to vertical stabalizer

Postby Tralika » Thu Apr 24, 2014 2:31 pm

Thanks for the replies.
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