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Aileron Trim

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professor71(at)hotmail.co
Guest

Posted: Wed Mar 08, 2006 9:08 pm Post subject: Aileron Trim

Hi List

I am going to retrofit my 601HHD with an aileron trim to balance out my 

heavy left wing when flying solo. Does anyone have drawings as how to do 

this? I will be using the RAC servo with external trim tab. Was wondering 

how far back from the trailing edge to mount the servo? Left or right wing 

preference? Size of the trim tab and any other helpful info and drawings.



Thanks

John

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mtherr(at)yahoo.com
Guest

Posted: Thu Mar 09, 2006 5:01 am Post subject: Aileron Trim

I don't have measurements, but I describe how I did on

my website.  I made a mockup aileron to test various

installations before making an opening in my aileron.



http://mthobby.pcperfect.com/ch601/chowings4.htm



The tab is effective for the purpose you identified,

but the airplane should be fairly balanced first (it

is not enough effective to correct major balance

problems and you probably do not want to use too much

aileron deflection just for keeping the plane

straight).



 	  Quote: 	
		  From my picture, it appears the tab is 420 mm wide.


	


I do believe that the tab will be more effective if

installed inboard of the wing than at the outboard end

of the wing.  The tab acts to move the aileron up or

down, not the wing.  I think that if installed at the

outboard end, the tab has more power to act on the

position of the wing (arm) while it does have the same

effect on the aileron than if it is on the inboard end

(more cancellation of effect).  But, this being said,

I'm not an ingineer... Real ingineers, you're welcome

to shoot or support this therory!



Michel

PS: I also had a heavy left wing problem. I corrected

it by making a new rear spar attachment plate on which

I offset the hole.  The new plate was matched drilled

with the old plate installed on a drilling jig (a

piece of plywood with two guides at 90 degrees).  It

took a long evening to remove the wing, remove the

rear plate, drill a new plate, install it, and

readjust the incidence of the wing root fairing

(remove rivets, position, redrill, install a few

additional rivets.)



To check the incidence, I attached plastic blocs on a

level.  On each bloc, I tapped holes and installed

screws.  The front bloc fits under the front spar. 

The rear bloc fits under the rear spar.  By adjusting

the screws to get the level straight on one wing, I

was able to compare the level of the second wing.  I

was also able to confirm that there is no twist in the

wings.  It is also easy to calculate the exact

incidence of the wing (calculate the height difference

of the screws, consider the height of the rear spar

relative to the front spar - from the rib template,

apply sinus law or something like that).



--- john H <professor71(at)hotmail.com> wrote:



 	  Quote: 	
		   

 <professor71(at)hotmail.com>

 

 Hi List

 I am going to retrofit my 601HHD with an aileron

 trim to balance out my 

 heavy left wing when flying solo. Does anyone have

 drawings as how to do 

 this? I will be using the RAC servo with external

 trim tab. Was wondering 

 how far back from the trailing edge to mount the

 servo? Left or right wing 

 preference? Size of the trim tab and any other

 helpful info and drawings.

 

 Thanks

 John

 

 

 

 

 



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----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby

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