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  #1  
Old 03-21-2021, 12:14 AM
jrock836's Avatar
jrock836 jrock836 is offline
 
Join Date: Nov 2020
Location: Burleson, Texas
Posts: 198
Default Upper Cowling Damage

My upper cowling has cracks and paint damage, mostly around the Phillips head screws. While I work on my Annual next month, I’m thinking about sending my upper cowling to the paint shop for repair and repaint. Has anyone found a better washer/screw combo to use that will protect the paint and distribute the load better than the little plastic washers under the phillips screw head? Is there maybe some type of washer that has a collar that would fit into a counter sunk hole? There has to be something better than the existing setup. Although the existing screws do a good job of holding the cowling in place, it doesn’t really seem to be a well thought out solution.
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Van's RV-12 #120566 - ELSA - N49DD
Hawkins Field (35TT ) Godley, TEXAS!


LSRI-A for N49DD / EAA #1409566
Pvt Pilot since '79! / USNR - MA2
Retired LEO / PADI MSDT / SDI OW Instructor
Scuba Equipment Tech (PT Retirement Job)

ďIf you can walk away from a landing, itís a good landing. If you can use the aircraft the next day, itís an outstanding landing.Ē Ė Chuck Yeager

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Last edited by jrock836 : 03-21-2021 at 12:20 AM.
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  #2  
Old 03-21-2021, 06:28 AM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
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Default

Look for Tinnerman washers. They are designed for countersunk applications and distribute the load over a much larger area than just the screw head. Here's what Spruce offers (note they come in different sizes):

https://www.aircraftspruce.com/catal...49washers2.php
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2001 RV-6 N46KB
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  #3  
Old 03-23-2021, 05:21 PM
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jrock836 jrock836 is offline
 
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Quote:
Originally Posted by Kyle Boatright View Post
Look for Tinnerman washers. They are designed for countersunk applications and distribute the load over a much larger area than just the screw head. Here's what Spruce offers (note they come in different sizes):

https://www.aircraftspruce.com/catal...49washers2.php
Thanks.. Those might work and will most likely hide much of the flaking paint around the screw heads, if I decide to wait on painting..

Has anyone else done anything differently on an already completed RV12 cowling?
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Joe
Van's RV-12 #120566 - ELSA - N49DD
Hawkins Field (35TT ) Godley, TEXAS!


LSRI-A for N49DD / EAA #1409566
Pvt Pilot since '79! / USNR - MA2
Retired LEO / PADI MSDT / SDI OW Instructor
Scuba Equipment Tech (PT Retirement Job)

ďIf you can walk away from a landing, itís a good landing. If you can use the aircraft the next day, itís an outstanding landing.Ē Ė Chuck Yeager

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  #4  
Old 03-23-2021, 05:57 PM
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Piper J3 Piper J3 is offline
 
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I use countersunk washers everywhere...
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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 650

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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  #5  
Old 03-23-2021, 07:25 PM
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jrock836 jrock836 is offline
 
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Quote:
Originally Posted by Piper J3 View Post
I use countersunk washers everywhere...
-
Hi Jim.. Did you use them on the front of your fiberglass cowling near the intakes?
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Joe
Van's RV-12 #120566 - ELSA - N49DD
Hawkins Field (35TT ) Godley, TEXAS!


LSRI-A for N49DD / EAA #1409566
Pvt Pilot since '79! / USNR - MA2
Retired LEO / PADI MSDT / SDI OW Instructor
Scuba Equipment Tech (PT Retirement Job)

ďIf you can walk away from a landing, itís a good landing. If you can use the aircraft the next day, itís an outstanding landing.Ē Ė Chuck Yeager

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  #6  
Old 03-23-2021, 11:54 PM
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Piper J3 Piper J3 is offline
 
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That is one location where I have not used the C'sink washers. My upper cowl is scheduled for cosmetic upgrade.
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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 650

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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  #7  
Old 03-24-2021, 12:25 PM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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Quote:
Originally Posted by jrock836 View Post
Hi Jim.. Did you use them on the front of your fiberglass cowling near the intakes?
I just performed an oil change so had to reinstall the cowl. Like others, I use conical washers on every flat-head screw on the exterior, including the landing light lenses. Just for the fun of it, I took one and turned it upside down on the forward cowl screws to which youíre referring. They actually didnít look too bad. Something you might want to evaluate for yourself.
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  #8  
Old 03-24-2021, 01:14 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
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Quote:
Originally Posted by Bob Y View Post
I just performed an oil change so had to reinstall the cowl. Like others, I use conical washers on every flat-head screw on the exterior, including the landing light lenses. Just for the fun of it, I took one and turned it upside down on the forward cowl screws to which youíre referring. They actually didnít look too bad. Something you might want to evaluate for yourself.
Pictures please, I can't quite visualize this.
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  #9  
Old 03-24-2021, 01:41 PM
Bob Y Bob Y is offline
 
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I thought to take a photo, but then thought, what for, nothing to see 😊. Guess I was wrong. Since the forward cowl screws arenít counter sunk, I simply turned the washer over so the cone faced away from the cowl. Yes, the screw head sat high in the cone, but the washer distributed the load from the screw around the hole - what I believed the original posting was trying to accomplish.
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  #10  
Old 03-24-2021, 02:07 PM
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Piper J3 Piper J3 is offline
 
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Probably better way to accomplish this... why not just get Stainless Steel flat washer? Perhaps a thin shim washer would be ideal.
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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 650

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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