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I would also check the rigging of the rudders. Slight pressure on the rudder will also cause the coupe to roll. I have pedals in mine and it takes very little movement to cause the plane to roll. If the rudders are out on a plane without pedals I dont know how you could tell which one was causing the wing heavy condition, the rudders or the ailerons. Bill ----- Original Message ----- From: "Hartmut Beil" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, October 19, 2005 2:52 PM Subject: Re: [COUPERS-TECH] Trim Tabbing > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > Adding a little to the trim tab discussion, here my experience. > A few years ago I reworked all the Heim bearings on all control pushrods to > combat the aileron flutter I experienced before. > I then rigged the plane according to the manual and found that relatively > easy to do. Just follow the steps in the manual. > I also straightened out the trailing edges of the ailerons to get a fresh > start on the trimming procedure. > When I took the plane up for it's first test flight, I found it almost > perfectly trimmed - it was pulling to one side a bit and that was simply > corrected by bending the opposite side. > > If I had to deal with a wing heavy Coupe again, I would start with checking > the rigging first. Even a slightly off center nose wheel alignment can be > felt in flight. The nose wheel wants to fly straight and thereby adds forces > to the control system. > Then if the ailerons are bent already and most are, adding a tab to combat > that effect is basically just eating your cruising speed. You might be able > to balance the wings, but you also add drag. Make sure the ailerons are > straight to begin with and start from there. > Bending the trailing edge is not a big deal and it does not need much > bending to get a satisfactory result. > > Here is what the manual says: > > "If wing heaviness exists on test flights, double check steps outlined above > (rigging) for misalignment. > If wing heaviness exists with controls properly aligned, extreme trailing > edge of aileron (flat section containing rivets) may be used as fixed trim > tab and bent with suitable bending pliers. > Bending must begin at out board end of aileron opposite heavy wing, and > bending must be downward. Amount of bending and length of area bent varies > with amount of wing heaviness present. > Slight bend over great length is preferable to pronounced bend over lesser > length. It has been determined that wing heaviness necessitating 5 degrees > deflection of control wheel from neutral to hold plane on course in flight > can be corrected by 3/16 inch downward bend for full length of trailing > edge." > > > Hartmut N3330H > > > > > ----- Original Message ----- > From: "DONALD BOWEN" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Cc: <[email protected]> > Sent: Wednesday, October 19, 2005 7:58 PM > Subject: RE: [COUPERS-TECH] Trim Tabbing > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > > > > Raising the left wing can be accomplished by lowering (bending down) the > tab > > on the right wing. > > > > Don Bowen > > [EMAIL PROTECTED] > > > > > > ----Original Message Follows---- > > From: "Ralph Finch" <[EMAIL PROTECTED]> > > Reply-To: "Ralph Finch" <[EMAIL PROTECTED]> > > To: "'Ercoupe Technical Discussion (moderated)'" <[email protected]> > > Subject: [COUPERS-TECH] Trim Tabbing > > Date: Wed, 19 Oct 2005 06:34:58 -0700 > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > > advice in this forum.]---- > > > > > > My Alon has the same problem, and it already has trim tabs > > on each side. I remember a mechanic said I should bend > > the tab only on one side but I don't remember the rule > > as to which side and direction (up/down) to use, anybody > > know what I'm referring to and remember the rule? And, > > I understand one should bend the tab with a couple of > > pieces of 2x4 so the entire tab gets bent evenly. > > > > Ralph Finch > > Davis, California > > > > > From: "roger anderson" <[EMAIL PROTECTED]> > > > Subject: Re: [COUPERS-TECH] new ercoupe owner > > > > > > I picked up a Coupe in Houston a couple of years ago. I > > > also flew home with it wanting to roll left, holding right > > > aileron for the hours back to Tennessee. On the ground > > > when home, all rigging and alignment looked correct. > > > Realizing the majority here will recommend following the > > > coupe procedure of bending the trailing edge of the aileron > > > as a trim method, I prefered a small trim tab being installed > > > instead. I just don't like bending the wing structure. > > > Also, any future minor adjustments can be easily made with a > > > trim tab. A small tab slipped in and rivited between the wing > > > trailing edge corrected the problem and it flew beautifully > > > hands off after that. roger > > > > > ============================================================================ > == > > To leave this forum go to: http://ercoupers.com/lists.htm > > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > > ============================================================================ > == > > To leave this forum go to: http://ercoupers.com/lists.htm > > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > > > > ============================================================================ == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
