Horizontal Stab not horizontally aligned to Wings  
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All Forums >> RC Airplanes >> Aerodynamics >> Horizontal Stab not horizontally aligned to Wings
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Horizontal Stab not horizontally aligned to Wings - 7/22/2004 7:09:53 PM   
737-700


 

Posts: 61
Joined: 2/25/2004
From: Oaxaca, MEXICO
Status: offline 		Hi, I'm finishing assembling my H9 Super Cub, this is my 8th ARF so I think I was overconfident when assembled the horizontal stab and after the epoxy cured I realized the horizontal stab is not horizontally aligned with the wing, I measured the height of the stab from floor and there is a 1/2 inch difference at the tips of the stab that is almost 28 inches long. The vertical fin is 90 degrees in both sides in relation to the stab so it is not 90° from fuselage and wings.

Questions:

Will it Fly? What will be the effect in flight of the horizontal stab not being aligned with the wings?
Is any radio mix I can use to solve the problem?

Thanks in Advance

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< Message edited by 737-700 -- 7/22/2004 1:13:01 PM >

_____________________________

Rafael Castaneda - www.rcoaxaca.com
www.737-700.com/simuladores/
       Post #: 1

RE: Horizontal Stab not horizontally aligned to Wings - 7/22/2004 7:16:14 PM   
Tall Paul



Posts: 4701
Joined: 6/23/2002
From: Palmdale, CA, USA
Status: offline 		The plane will tend to turn towards the higher side.
It will be a minor annoyance at best.

(in reply to 737-700)
       Post #: 2

RE: Horizontal Stab not horizontally aligned to Wings - 7/26/2004 10:27:43 AM   
Sergeant



Posts: 39
Joined: 7/5/2004
From: Carmarthen, UNITED KINGDOM
Status: offline 		Yes, it should fly. Only the elevator will act as a very ineffective rudder but good elevator, and the rudder will be an ineffective elevator.
Tom

(in reply to Tall Paul)
       Post #: 3

RE: Horizontal Stab not horizontally aligned to Wings - 7/26/2004 4:00:30 PM   
737-700


 

Posts: 61
Joined: 2/25/2004
From: Oaxaca, MEXICO
Status: offline 		Tall Paul and Sergeant Thanks for the info, next sunday should be the first flight, I saw a Funtana 40 in my club last saturday and I noticed, it has flying wires in the bottom of the hor stab, Do you think I can use flying wires to make the stab horizontal?

quote:

ORIGINAL: Sergeant

Yes, it should fly. Only the elevator will act as a very ineffective rudder but good elevator, and the rudder will be an ineffective elevator.
Tom


That is in knife edge flight right?

_____________________________

Rafael Castaneda - www.rcoaxaca.com
www.737-700.com/simuladores/

(in reply to Sergeant)
       Post #: 4

RE: Horizontal Stab not horizontally aligned to Wings - 7/26/2004 5:03:05 PM   
Tall Paul



Posts: 4701
Joined: 6/23/2002
From: Palmdale, CA, USA
Status: offline 		Flying wires as you describe are required to keep the surface from fluttering off the airplane.
Cubs have them, but using them to apply the leveling you want will stress the structure of the horizontal and vertical.
Fly it, and see if the misalignment is bothersome.
If not forget it.
If it is, heat the epoxy to loosen its grip, and re-epoxy it level.

(in reply to 737-700)
       Post #: 5

RE: Horizontal Stab not horizontally aligned to Wings - 7/26/2004 10:18:51 PM   
737-700


 

Posts: 61
Joined: 2/25/2004
From: Oaxaca, MEXICO
Status: offline 		Thanks for your comments I will fly it as it is, let see what the out come is, I will post the results.

_____________________________

Rafael Castaneda - www.rcoaxaca.com
www.737-700.com/simuladores/

(in reply to Tall Paul)
       Post #: 6

RE: Horizontal Stab not horizontally aligned to Wings - 7/29/2004 3:29:16 PM   
afterburner



Posts: 1396
Joined: 6/22/2002
From: Moseley, VA, USA
Status: offline 		Tall Paul,
I'm wondering about the suggestion to heat the epoxy and reposition the stab. How much heat is required?Also, wouldn't you have to be heating top, bottom, and both sides at the same time too loosen it up enough? Lastly, would the covering in those areas have to be replaced due to the heat that I'm assuming would be needed. I'm asking because I have a similar problem and I'll be maidening it this weekend. Since it's an aerobatic 1\4 scale it will be more of a nuisance than say on the Cub. Thanks

marty

(in reply to Tall Paul)
       Post #: 7

RE: Horizontal Stab not horizontally aligned to Wings - 7/29/2004 4:53:54 PM   
Tall Paul



Posts: 4701
Joined: 6/23/2002
From: Palmdale, CA, USA
Status: offline 		I've heated epoxy to remove parts. I'm not sure it rehardens properly, that's why I mentioned the re-epoxy.
The epoxy holds the heat well, so the heatgun can be moved from place to place during the process.
If after the part is repositioned and the epoxy has cooled it appears to be holding, it should be OK.
But I'd test on something first.

(in reply to afterburner)
       Post #: 8

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