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  #1  
Old 04-13-2018, 08:58 AM
Surfdoc Surfdoc is offline
 
Join Date: Feb 2009
Location: Fly-In Port Orange, FL
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Default 9 Elevator trim spar Question

Working on the left elevator and the manual calls for countersinking the elevator trim spar in order to receive the dimples from the skin. Question: Can one dimple the trim spar or is countersinking preferred?
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  #2  
Old 04-13-2018, 11:25 AM
Joe Parish Joe Parish is offline
 
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Location: Sioux Falls, SD
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General rule of thimb is to dimple if .040 thick or less. Countersink if over that. Hope that helps.
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Last edited by Joe Parish : 04-13-2018 at 02:44 PM. Reason: Clarification
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  #3  
Old 04-13-2018, 04:27 PM
nilberg nilberg is offline
 
Join Date: Dec 2012
Location: Katy, TX
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Regardless of the thickness, isn't the countersinking done to allow for the hinge to have a flat area to be riveted on ?
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  #4  
Old 04-16-2018, 03:28 PM
JSOliveira JSOliveira is offline
 
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Location: Port Townsend, Washington
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Quote:
Originally Posted by Surfdoc View Post
Working on the left elevator and the manual calls for countersinking the elevator trim spar in order to receive the dimples from the skin. Question: Can one dimple the trim spar or is countersinking preferred?
You want to countersink the spar. The dimpled skin is the top layer, then it fits into the countersink. The third layer is the piano hinge which just get's drilled and the shop head of the rivet is against the hinge so you don't have to worry too much about how thin the spar is.
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