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Old Feb 21, 2013, 03:51 PM
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Joined Feb 2010
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Angle of incidence question

Hey all...long time lurker, infrequent poster here.

Quick question (I didn't see a FAQ sticky anywhere): Building these airliners, is there a rule of thumb regarding angle of incidence for the wings and stab? I want to give the wings a few degrees positive...I know that, but not sure about the tail. I want to give it a little aircraft nose up trim (which would be a negative angle of incidence for the stab). Before I glue this is this the right thing to do?

Model is the KLM DC-9-15. Thanks for the help!
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Old Feb 21, 2013, 05:09 PM
Up-Out-&-Gone
demondriver's Avatar
Charelston SC U.S.A.
Joined Mar 2007
15,363 Posts
Hi GjFerg, I don't want to speak for other Builders here on RCG but I try and closely match the Main wing & stab Incidence angle of the plane I'm building as closely as possible.

I would say the DC-9 series has a Zero angle of Inc on the stab and a positive Up angle on the leading angle of edge of its wings between 2-4 degrees of incidence.

I hope this helps Sir!
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Old Feb 21, 2013, 05:19 PM
Fly it like you STOL it!
Keenan smith's Avatar
United Kingdom, London
Joined Dec 2010
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i agree with DD
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Old Feb 21, 2013, 06:45 PM
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Cool...thanks!
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Old Feb 22, 2013, 07:24 AM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
North AL, USA
Joined Nov 2009
1,864 Posts
The 2 degree angle of incidence is what I'm using on the Martin 4-0-4. The 4-0-4 was rather unusual; it had 3 degrees positive on the wing and a bit under 1 degrees positive on the horizontal stabilizer. The seasoned builders here recommended setting the stab to 0 and making the wing 2.

Going with that, hope it works!

Good luck.
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Old Feb 22, 2013, 02:43 PM
The Depronizer
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Germany, NRW, Dortmund
Joined Aug 2012
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Quote:
....wings between 2-4 degrees of incidence.....
i second that. with these numbers youŽll almost always be fine.
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