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  #1  
Old 09-24-2017, 04:06 PM
Chris Cooper Chris Cooper is offline
 
Join Date: Jan 2017
Location: Aberdeen, UK
Posts: 12
Default Elevator trim tab play

Fixed the elevator trim tab to the hinge and attached the motor and actuator. With the clevis pin in place I have about 0.5mm of play. The pin is very slightly loose in the trim tab horn. Is this acceptable?
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  #2  
Old 09-24-2017, 04:26 PM
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Vlad Vlad is offline
 
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After couple thousand hours of flying I had considerable play in elevator trim tab due to an elongated hole. I fly an RV9A. A good friend of mine machined a bushing out of a rivet. Fits perfect feels tight. Thanks Julian!







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  #3  
Old 09-24-2017, 05:01 PM
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F1Boss F1Boss is offline
 
Join Date: Aug 2006
Location: Taylor Texas
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Default "No"

Quote:
Originally Posted by Chris Cooper View Post
Fixed the elevator trim tab to the hinge and attached the motor and actuator. With the clevis pin in place I have about 0.5mm of play. The pin is very slightly loose in the trim tab horn. Is this acceptable?
I think the consensus would be "no - get it fixed". There are various ways to bush the hole in the arm to get a better fit at the pin.

Good catch, by the way!

Best,
Mark
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  #4  
Old 09-24-2017, 07:08 PM
brad walton brad walton is offline
 
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Location: Cypress, TX
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When you say 0.5 mm play, is that at the trailing edge? I had about a 1/16 inch play at the trailing edge after 390 hours. I found the trim tab hole was about 3 one thousands inch larger than the clevis pin diameter. After reading your post, I fabricated a press fit clevis pin and now have no trailing edge play. I will be interested to see if its easier to hold altitude accurately.
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  #5  
Old 09-24-2017, 07:15 PM
vluvelin vluvelin is offline
 
Join Date: Dec 2013
Location: Montreal
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Quote:
Originally Posted by Vlad View Post
After couple thousand hours of flying I had considerable play in elevator trim tab due to an elongated hole. I fly an RV9A. A good friend of mine machined a bushing out of a rivet. Fits perfect feels tight. Thanks Julian!
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  #6  
Old 09-25-2017, 01:25 AM
Chris Cooper Chris Cooper is offline
 
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Yes, at the trailing edge.
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  #7  
Old 09-25-2017, 09:29 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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If my math is correct .5 mm is less than .020 "
.020 " free play at the the trailing edge is totally fine.
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  #8  
Old 09-25-2017, 09:33 AM
Chris Cooper Chris Cooper is offline
 
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Thanks for all the replies. Is there a limit for this?
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  #9  
Old 09-25-2017, 10:00 AM
rvbuilder2002 rvbuilder2002 is offline
 
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In service experience and GVT testing (on an airplane that for the test had ~ 1/16" play) has shown it to not be very critical with even quite a bit of play assuming aircraft VNE limits are complied with.
I think a conservative limit would be .032 or 1/32".
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  #10  
Old 09-25-2017, 12:00 PM
MED MED is offline
 
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Location: Aiken, SC
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Quote:
Originally Posted by rvbuilder2002 View Post
If my math is correct .5 mm is less than .020 "
.020 " free play at the the trailing edge is totally fine.
A millimeter is actually 0.03937 inch - interestingly, the same number as the number of inches in a meter. For quick calculations, for those of us who must make the conversion in our head, because we don't think in metric, we always just use 0.040 inch (40 mils) as "close enough for government work."
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