Airfoil on tail surface OK?  
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All Forums >> RC Airplanes >> Aerodynamics >> Airfoil on tail surface OK?
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Airfoil on tail surface OK? - 4/20/2004 7:18:06 AM   
abufletcher



Posts: 5643
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: offline 		When I built the tail surface for my Eindecker III, I took the easy route (always a bad idea) and built it flat on the bottom and slightly curved on the top. The original had a surface curved both top and bottom. My tail surface ended up about a 1/4" think in the middle and 1/8" at the edges. My question is this: Will having what is in effect and asymetrical airfoil on the tail cause the plane to be unstable? Do I need to rebuilt this? Or in the end will the effect be negligible (something to be handled with a bit of trim)?

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RE: Airfoil on tail surface OK? - 4/20/2004 7:20:12 AM   
BMatthews



Posts: 9015
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		It'll be fine. You'll just need a touch more up trim. The CG will still be in the same place.

_____________________________

Witty saying to be plagarized shortly.....

(in reply to abufletcher)
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RE: Airfoil on tail surface OK? - 4/20/2004 7:52:31 AM   
abufletcher



Posts: 5643
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: offline 		Bruce, thanks for the reassurance. Will the trim need to be adjusted at higher speeds since presumably as the surface moves faster more lift will develope?

(in reply to BMatthews)
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RE: Airfoil on tail surface OK? - 4/20/2004 7:56:22 AM   
FHHuber



Posts: 4931
Joined: 1/1/2003
From: gone, , USA
Status: offline 		Mount it curved side down. you may need a touch of down trim to compensate... but I doubt it will be a visible amount of control surface deflection.

(in reply to abufletcher)
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RE: Airfoil on tail surface OK? - 4/20/2004 4:53:45 PM   
Tall Paul



Posts: 4701
Joined: 6/23/2002
From: Palmdale, CA, USA
Status: offline
quote:

ORIGINAL: abufletcher

When I built the tail surface for my Eindecker III, I took the easy route (always a bad idea) and built it flat on the bottom and slightly curved on the top. The original had a surface curved both top and bottom. My tail surface ended up about a 1/4" think in the middle and 1/8" at the edges. My question is this: Will having what is in effect and asymetrical airfoil on the tail cause the plane to be unstable? Do I need to rebuilt this? Or in the end will the effect be negligible (something to be handled with a bit of trim)?

What Bruce says.
Your surface trim authority will be more than capable of handling any trim problems.

(in reply to abufletcher)
       Post #: 5

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