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601XL - Aileron Trim Tab Deflection

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dvanlanen

Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI

Posted: Fri Nov 14, 2008 8:30 pm Post subject: 601XL - Aileron Trim Tab Deflection

I just finished installing my aileron trim, and when I tested it, I can only get a total of 40 degrees of deflection.  According to the plans, I should be able to get 50 degrees of deflection (25 up and 25 down).  Adjusting the length of the control rod only changes the distribution of the 40 degrees between up and down – it does not increase the total deflection.  I checked that the servo was working correctly, which it was (.7” travel per specs).  I also checked that there was no binding of the control rod clevis with the trim tab horn angle.  The only thing I could find was that the center of the control rod mounting hole in the horn angle was 13 mm up from the flange instead of the 12 mm specified in the plans.  I find it hard to believe that 1 mm would cause a 10 degree loss in deflection.    

Has anyone else experienced this problem, and if so, what did you do to resolve?  

Thanks,  

Dave Van Lanen  

601XL – tail done, flaps done, working on ailerons     [quote][b]

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dvanlanen

Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI

Posted: Fri Nov 14, 2008 8:30 pm Post subject: 601XL - Aileron Trim Tab Deflection

I just finished installing my aileron trim, and when I tested it, I can only get a total of 40 degrees of deflection.  According to the plans, I should be able to get 50 degrees of deflection (25 up and 25 down).  Adjusting the length of the control rod only changes the distribution of the 40 degrees between up and down – it does not increase the total deflection.  I checked that the servo was working correctly, which it was (.7” travel per specs).  I also checked that there was no binding of the control rod clevis with the trim tab horn angle.  The only thing I could find was that the center of the control rod mounting hole in the horn angle was 13 mm up from the flange instead of the 12 mm specified in the plans.  I find it hard to believe that 1 mm would cause a 10 degree loss in deflection.    

Has anyone else experienced this problem, and if so, what did you do to resolve?  

Thanks,  

Dave Van Lanen  

601XL – tail done, flaps done, working on ailerons     [quote][b]

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psm(at)att.net
Guest

Posted: Fri Nov 14, 2008 8:37 pm Post subject: 601XL - Aileron Trim Tab Deflection

Hi Dave,



 One thought is the servo you have is not the correct one.  There is a 1.2 inch servo from the same folks as the .7 inch one.  I'm not sure which one I have or what displacement I get.



 One other thought is the prints are sometimes a bit optimistic on things like this.  The flaps are notorious for this issue since ZAC decided to change the entire flap motor mechanism to achieve only 20 degrees instead of the 30 provided by the older motor.  Since there is no version control on the drawings, the details on your drawings depend on the exact date they were printed but the parts depend on the exact date they were shipped.  I guess a call to ZAC is the only way to answer either of the questions I raised.  



 (Don't you just hate people who answer questions with further questions?)



 Paul

 XL getting close



 

 At 08:28 PM 11/14/2008, you wrote:



 [quote]I just finished installing my aileron trim, and when I tested it, I can only get a total of 40 degrees of deflection.  According to the plans, I should be able to get 50 degrees of deflection (25 up and 25 down).  Adjusting the length of the control rod only changes the distribution of the 40 degrees between up and down – it does not increase the total deflection.  I checked that the servo was working correctly, which it was (.7” travel per specs).  I also checked that there was no binding of the control rod clevis with the trim tab horn angle.  The only thing I could find was that the center of the control rod mounting hole in the horn angle was 13 mm up from the flange instead of the 12 mm specified in the plans.  I find it hard to believe that 1 mm would cause a 10 degree loss in deflection.  

 

 Has anyone else experienced this problem, and if so, what did you do to resolve?

 

 Thanks,

 

 Dave Van Lanen

 

 601XL – tail done, flaps [b]

- The Matronics Zenith601-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Terry Phillips

Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT

Posted: Fri Nov 14, 2008 9:09 pm Post subject: 601XL - Aileron Trim Tab Deflection

Dave



 I was only able to get +20 -19° in mine. See my Kitlog Pro entry for 1/23/08 (link below). I called ZAC and Caleb told me that would probably be more than enough. I decided to just live it. 



 I thought the difference might have been that ZAC has started issuing an aileron trim tab control horn, 6-ATO-1-6 that is identical to the elevator trim control horn. When I noticed that the part in my kit differed from the drawing, they sent me a new one. But the new one was identical to the 1st one. 



 If I were doing the ailerons again (and I just might), I would do what Mirko reported doing. I.e., I'd rivet a length of L-angle on the inside of the aileron top skin under the servo attachment holes to reduce flexing of the skin when the trim tab is actuated. Or else, I might just use a spring loaded internal trim like Klaus Truemper did on his HDS.



 Terry



 

 At 10:28 PM 11/14/2008 -0600, you wrote:



  	  Quote: 	
		  I just finished installing my aileron trim, and when I tested it, I can only get a total of 40 degrees of deflection.  According to the plans, I should be able to get 50 degrees of deflection (25 up and 25 down).  Adjusting the length of the control rod only changes the distribution of the 40 degrees between up and down – it does not increase the total deflection.  I checked that the servo was working correctly, which it was (.7” travel per specs).  I also checked that there was no binding of the control rod clevis with the trim tab horn angle.  The only thing I could find was that the center of the control rod mounting hole in the horn angle was 13 mm up from the flange instead of the 12 mm specified in the plans.  I find it hard to believe that 1 mm would cause a 10 degree loss in deflection.  

 

 Has anyone else experienced this problem, and if so, what did you do to resolve?

 

 Thanks,

 

 Dave Van Lanen

 

 601XL – tail done, flaps done, working on ailerons 	
 

 

 Terry Phillips  ZBAGer

 ttp44~at~rkymtn.net

 Corvallis MT

 601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons are done; working on the wings

 http://www.mykitlog.com/N47TP/     [quote][b]

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_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings.

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