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Author Topic: Sig Twister rudder offset?  (Read 702 times)

Online James Holford

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Sig Twister rudder offset?
« on: April 14, 2018, 10:56:12 AM »
Plans shows rudder offset for the twister.

 Should I do as plans and just offset rudder?

Or

Should I offest entire vertical Stab with a tiny offset??

Or

Shall I just put it square and just a degree of engine offset?



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Jamie Holford
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Offline Tim Wescott

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Re: Sig Twister rudder offset?
« Reply #1 on: April 14, 2018, 11:59:21 AM »
If you're going with adjustable leadouts, put in just enough offset that you're sure it's not pointing in, and then spend some time trimming.  On a profile I kind of alternate between doing my best to get them dead straight forward, and putting in about 1/4 to 1/2 a degree offset (that's about a 1/32 kick-out at the back), When I mount them straight it's because the upside of a whippy profile fuselage is that with a heat gun you can correct for mild warps in the rear fuselage.

If you're not going with adjustable leadouts I have neither experience or advice to offer (except that it's pretty easy to add adjustable leadouts before the covering goes on.
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Offline Bootlegger

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Re: Sig Twister rudder offset?
« Reply #2 on: April 14, 2018, 12:20:30 PM »

  I am with Tim, just enough to know that there is no inset.
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Online James Holford

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Re: Sig Twister rudder offset?
« Reply #3 on: April 14, 2018, 01:00:19 PM »
Thanks.

 It does have adjustable leadouts installed.

 Wasnt sure wether to set entire stab or just the rudder itself.

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Offline wwwarbird

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Re: Sig Twister rudder offset?
« Reply #4 on: April 14, 2018, 03:37:04 PM »

 James,

 Just wondering, when you say "stab" are you referring to your horizontal stabilizer or the vertical fin (ahead of the rudder)? "Stab" is typically a short nickname for the horizontal stabilizer, and you would never want any left/right offset when mounting it.
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Online Dane Martin

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Re: Sig Twister rudder offset?
« Reply #5 on: April 14, 2018, 06:57:26 PM »
Agreed. Glue it all on straight. No offset anywhere.

Online Brett Buck

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Re: Sig Twister rudder offset?
« Reply #6 on: April 14, 2018, 07:18:30 PM »
Shall I just put it square and just a degree of engine offset?

   I think you should make it (ground) adjustable, and then adjust it to be straight ahead or *just barely to the right* (maybe 1/32" at the trailing edge) to start with, mostly just to cover the possibility that something else is a little off. Then adjust from there, my suggested procedure is in the archives.

    Brett


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