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  #1  
Old 05-23-2021, 11:11 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,525
Default Broken Cowling Piano Hinge...

A friend has a Synergy built RV-12 with cowling piano hinge problems. Last year two “lugs” wore thin and broke off the tight side top piano hinge (cowling side) near the oil door. Now there is broken lug (firewall side) on lower piano hinge again on right side of airplane. Synergy did some shotty work on this airplane and perhaps that is problem we are experiencing.

Anyone else have broken piano hinge on RV-12 cowling?
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 726

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #2  
Old 05-23-2021, 12:47 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
Posts: 391
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I had the same problem, I have a repair method that works great without touching the paint. I’ll find you the post.
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  #3  
Old 05-23-2021, 12:51 PM
seagull seagull is offline
 
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Location: San Bernardino
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https://vansairforce.net/community/s...3&postcount=11

Study the picture, it is the finish repair.
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  #4  
Old 05-23-2021, 04:06 PM
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catmandu catmandu is offline
 
Join Date: Dec 2005
Location: Sierra Nevada
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Timely! I just had one 26-year-old eye break, this is a very nice fix.
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  #5  
Old 05-23-2021, 08:39 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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Clever idea, Walt! Have you had any loss of glue joint adhesion?
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  #6  
Old 05-23-2021, 10:02 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
Posts: 391
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Not yet, I used the regular JB, it is stronger than the 5 minute version. I have bonded many things in the past that had a lot less surface area that have not failed.
Scuff it up, clean with acetone, have a good fit with minimal glue line thickness, use some clamp pressure, not excessive. Let it completely cure, some heat will accelerate it. Use the remaining mix to test when the mixture is cured.
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  #7  
Old 05-24-2021, 09:35 AM
Floog Floog is offline
 
Join Date: Mar 2018
Location: Desert Aire, WA
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Nicely done, Walt! And I like your credo.
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  #8  
Old 05-25-2021, 10:08 AM
printbr printbr is offline
 
Join Date: Oct 2019
Location: Richland, WA
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Very timely, I just had two break in the past few weeks. Thanks for all the info.
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