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  #1  
Old 04-15-2011, 10:39 PM
RV7ator RV7ator is offline
 
Join Date: Jan 2005
Location: Boise, ID
Posts: 1,007
Default Centering Ray Allen Trim Annunciators

Is there any way to cause the annunciator LEDs that accompany the Ray Allen trim servos to track servo position accurately, or skew their center indication even if the servo is nowheres near center?

Out of the box, these things are very non-linear, and the center indication could find the servo considerable distance either side of center. Also, I know that on RV-7s (perhaps others) that far more elevator trim tab down deflection (nose up) is needed than up deflection. Thus I'd like to set the servo's mechanical position so that most of it's stroke, say 75%, is dedicated to down deflection with the annunciator LED next nearest one end of the display lit when the tab is in trail.

Any possibilities?

John Siebold
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  #2  
Old 04-17-2011, 10:25 PM
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MCA MCA is offline
 
Join Date: Jun 2005
Posts: 693
Default

John, I don't know if this is any help to you, but on most EFIS units and Vertical Power units you can set the indicator limits digitally in the setup menus to accomplish exactly what you want to do. So, if you are using any of these units, you might consider running the trim indicator through that.
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RV-7 980 hours, IO-390, VP-X (sold)
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  #3  
Old 08-31-2014, 06:17 PM
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Rosie Rosie is offline
 
Join Date: Dec 2004
Location: I live in on the Rosamond Skypark (CA) and am married to Victoria (Tuppergal).
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Resurrecting an old thread....can anyone tell me how to center the LED Ray Allen indicators? Do I run the indicator to 'Center' then readjust the pushrod to neutral? I don't remember how I did mine and now doing one for a friend, Rosie
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Paul A. "Rosie" Rosales
Rosamond Skypark (L00), CA
RV-6A, 4200+ hours since 7/4/2000
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  #4  
Old 08-31-2014, 07:04 PM
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pczar3 pczar3 is offline
 
Join Date: Jul 2005
Location: Bolingbrook, Illiniois
Posts: 254
Smile Just like you describe

Hi Rosie,
the Ray Allen units use a special led driver chip that has internal voltage comparators. Run the servo until the center led is lit then adjust the linkage.

Paul
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