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Electric trim rigging

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lsbrv7a(at)yahoo.com
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Posted: Mon May 01, 2006 5:36 am Post subject: Electric trim rigging

I have found the documentation on rigging the electrioc rudder trim thin.  Are there any guidelines for a apoximate length for the trreadded rod?  Is the servo in the retracted position?  What is the normal angle of the trim tab at the servo retracted position? What is the stroke of the servo? Wiring diragram?

  Thanks

Sherman Butler

RV-7a Wings

Idaho Falls

		

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dan(at)rvproject.com
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Posted: Mon May 01, 2006 6:15 am Post subject: Electric trim rigging

What I did is retract the servo arm fully...mark that location on the arm 

(just trace a line on the arm up against the servo body).  Then extend the 

arm fully.  Mark that location on the arm.  Measure halfway and mark that 

line on the arm.  Retract the servo until the halfway line is on the body of 

the servo.  The arm is now exactly in the middle of its range.  Now rig the 

pushrod so that the trim tab is in trail with the elevator.



That is how I rigged mine (RV-7), and I haven't had any problems in nearly 

900 hours.  No binding at either end of full travel.  My 2 cents is to start 

there, and you can always tweak it one way or another after you fly to bias 

the range up or down.



)_( Dan

RV-7 N714D (882 hours)

http://www.rvproject.com



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lsbrv7a(at)yahoo.com
Guest

Posted: Mon May 01, 2006 7:17 am Post subject: Electric trim rigging

Thanks Dan.

  Did you pull the servo manually or power it electricly?



Dan Checkoway <dan(at)rvproject.com> wrote:

  



What I did is retract the servo arm fully...mark that location on the arm 

(just trace a line on the arm up against the servo body). Then extend the 

arm fully. Mark that location on the arm. Measure halfway and mark that 

line on the arm. Retract the servo until the halfway line is on the body of 

the servo. The arm is now exactly in the middle of its range. Now rig the 

pushrod so that the trim tab is in trail with the elevator.



Sherman Butler

RV-7a Wings

Idaho Falls

		

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dan(at)rvproject.com
Guest

Posted: Mon May 01, 2006 7:53 am Post subject: Electric trim rigging

 	  Quote: 	
		    Did you pull the servo manually or power it electricly?


	


Believe it or not I used a 9V battery at the time.  Didn't have my 12V handy 

and the little 9V worked just fine.



)_( Dan

RV-7 N714D

http://www.rvproject.com

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retasker(at)optonline.net
Guest

Posted: Mon May 01, 2006 8:04 am Post subject: Electric trim rigging

You MUST power it to move it.  If you pull it you will likely break some 

gear teeth!



Dick Tasker



Sherman Butler wrote:



 	  Quote: 	
		  



Thanks Dan.

  Did you pull the servo manually or power it electricly?



Dan Checkoway <dan(at)rvproject.com> wrote:

  



What I did is retract the servo arm fully...mark that location on the arm 

(just trace a line on the arm up against the servo body). Then extend the 

arm fully. Mark that location on the arm. Measure halfway and mark that 

line on the arm. Retract the servo until the halfway line is on the body of 

the servo. The arm is now exactly in the middle of its range. Now rig the 

pushrod so that the trim tab is in trail with the elevator.



Sherman Butler

RV-7a Wings

Idaho Falls

		

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mark(at)macomb.com
Guest

Posted: Mon May 01, 2006 8:24 am Post subject: Electric trim rigging

We used a battery from a Makita 9.6 volt cordless drill. We just touched 

the leads to the contacts on the battery. Reverse the leads to reverse 

the direction of travel I believe.

Mark

Richard Tasker wrote:

 	  Quote: 	

 You MUST power it to move it.  If you pull it you will likely break some 

 gear teeth!

 Dick Tasker

 Sherman Butler wrote:

> 

>

> Thanks Dan.

>  Did you pull the servo manually or power it electricly?

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