some twist in my horizontal stab.

I know that your not supposed to have twist in the hor stab.  Well I do.  How much would be  acceptible?  Im not gonna tell you how much I have until you tell me how much is too much :)

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Permalink Reply by Jacob on January 10, 2013 at 6:39am

A digital inclometer will do this.  An iphone has one on it even these days. I think they give you a measurement in mm for twist in the standards section anyway.

Permalink Reply by Christopher Braun on January 4, 2013 at 11:10pm
Oh wait, is it simply pushing down on one corner and seeing how many millimeters the other corner raises up?
Permalink Reply by Rusty King on January 5, 2013 at 12:14am
That's it, flat side down. Just build flat and don't worry about measuring and quantifying unless you have a problem. If you need to determine exactly, you will need a conversion factor... I didn't need that, it just wasn't acceptable to me because it wasn't flat... Good luck.
Permalink Reply by Chris Aysen on January 11, 2013 at 9:15am

When you lay the stab flat on the table and the twisted end is more than 3/8" off the table remake the stab. It can probably take a little more twist than that and still fly but would dampen your planes aerial dynamic performance. Drilling out and reriveting needs to done very carefully because your talking about the manufactured make-up of the part (probably over 80% of required rivets would have to be drilled out). I don't recommend that. My two cents.

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