Rolling,rolling,rolling  
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Rolling,rolling,rolling - 11/3/2003 2:37:55 AM   
A1


 

Posts: 102
Joined: 3/30/2003
From: Greenville, KY, USA
Status: offline 		I've got a right roll on a new Megatech Capitol Flyer .46. Semi-sym. wing with 6% dihedral. Have checked: stab to wing distance, incidence of stab to wing, aileron movement, wing washout and all the level points I know of. The only thing I have not tried is putting Left thrust in the engine. Never heard of doing such a thing. I'm having to trim in about 30% of down on the right wing to fly straight at low to 3/4 throttle. Go from 3/4 to wide open and it starts it's right dip again. What else can it be.
       Post #: 1

RE: Rolling,rolling,rolling - 11/3/2003 4:40:35 AM   
RSands



Posts: 433
Joined: 3/15/2002
From: Toledo, OH, USA
Status: offline 		Well if both wings halves are at the same anlge of attack, the same length and have no twist, what about chord thickness or airfoil shape variance from side to side? Something less likely, the slipstream off the prop (try a different pitch or make).

(in reply to A1)
       Post #: 2

RE: Rolling,rolling,rolling - 11/3/2003 8:48:51 AM   
cappio777



Posts: 571
Joined: 10/10/2003
From: Raleigh, NC, USA
Status: offline 		Take the wing out and check if its BALANCED in the center. Sometimes different grades of balsa can make one panel heavier than another. If thats the case just glue little pieces of lead to the higher wingtip....whatever method you prefer as far as appearance is concerned.


(in reply to RSands)
       Post #: 3

RE: Rolling,rolling,rolling - 11/3/2003 3:06:27 PM   
vinnie



Posts: 651
Joined: 1/7/2002
From: hollywood, MD, USA
Status: offline 		Don't forget the rudder. Have you checked rudder trim/vertical stabalignment?

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Regards,
vinnie
AMA 680367

(in reply to A1)
       Post #: 4

RE: Rolling,rolling,rolling - 11/3/2003 9:10:37 PM   
Ben Lanterman



Posts: 1286
Joined: 10/27/2002
From: St. Charles, MO, USA
Status: offline 		The airplane is rolling right. Right aileron down will try to stop the roll but give a lot of yaw to the right which acts like right rudder and couples into the dihedral making a right roll. With a high wing airplane this is a strong reaction. It is called adverse yaw. You should always try to not give down aileron to trim a roll because of the adverse yaw.

Trim using the left aileron up. Not much to zero on the right.

For a roll of the amount you are talking about it must either be a twisted wing or rudder/fin alignment. It doesn't take much wing twist/misalignment to cause a roll.

Rudder/Fin alighment on a high wing airplane is especially powerful so should be looked at carefully.

Don't put in left thrust. Since the effect varies with speed it is not likely to be primarily caused by a wing weight imbalance although if it was right wing heavy and you used down aileron to stop it then it will make the roll worse.


_____________________________

Ben Lanterman

(in reply to vinnie)
       Post #: 5

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