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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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Ron Lendon

Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI

Posted: Fri Nov 14, 2008 9:38 pm Post subject: Re: 601XL - Aileron Trim Tab Deflection

Looks like the difference between 12mm and 13mm would be about 1.7 degrees at the .7 travel.  I didn't calculate what it would be out at the tip of the trim tab, don't have the dimension handy.

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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/

ideaz1(at)sbcglobal.net
Guest

Posted: Sat Nov 15, 2008 8:28 am Post subject: 601XL - Aileron Trim Tab Deflection

Hi Dave, the 12 vs 13mm hole placement causes a 8%  reduction in movement or 46 vs 50 deg. If you also shifted the location toward  the trailing edge of the trim tab this could easily account for the rest of the  error. With these small parts small errors add up fast. Do like Juan says if  your not ok with 40 deg. and make a new control horn. No big...

 Dirk 

 [quote]   ---

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Ron Lendon

Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI

Posted: Sat Nov 15, 2008 9:43 pm Post subject: Re: 601XL - Aileron Trim Tab Deflection

I ditto what Juan says. Just make a new part and let's all stop over analyzing this.

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dvanlanen

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

Posted: Sun Nov 16, 2008 1:06 pm Post subject: 601XL - Aileron Trim Tab Deflection

Thanks for everyone’s input to my question.  Sorry if it caused any discord in the group – that was not my intention.  

Dave  

  

Time: 09:44:12 PM PST US  

Subject: Re: 601XL - Aileron Trim Tab Deflection  

From: "Ron Lendon" <rlendon(at)comcast.net> 

  

I ditto what Juan says.  Just make a new part and let's all stop over analyzing  

this.  

--------  

Ron Lendon, Clinton Township, MI  

Corvair with Roy's Garage 5th bearing  

Zodiac XL, ScrapBuilder      [quote][b]

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