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  #11  
Old 07-08-2019, 09:26 PM
Ed_Wischmeyer's Avatar
Ed_Wischmeyer Ed_Wischmeyer is online now
 
Join Date: May 2005
Location: Savannah, GA
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No screws! On my RV-8, due to the curvature of the cowling, the quarter turn fasteners were installed without the retaining rings to those were removed for cowling removal -- no paint scratching.

Screw heads can get damaged over time, screws have been known to break, etc.

YMMV

Ed
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  #12  
Old 07-09-2019, 07:05 AM
Andrew Anunson Andrew Anunson is offline
 
Join Date: Apr 2012
Location: Pound, VA
Posts: 182
Default 1/4 turn

I've had my cowling on and off what seems like 100 times during the build and engine installation..... SO GLAD I went with 1/4 turn fasteners.

I too, do not use the retaining rings... but instead treat the 1/4 turn fasteners as screws (put them in pocket or bag as they are removed).
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  #13  
Old 07-09-2019, 07:21 AM
sailvi767 sailvi767 is offline
 
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,167
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Quote:
Originally Posted by Ed_Wischmeyer View Post
No screws! On my RV-8, due to the curvature of the cowling, the quarter turn fasteners were installed without the retaining rings to those were removed for cowling removal -- no paint scratching.

Screw heads can get damaged over time, screws have been known to break, etc.

YMMV

Ed
My cowl is the same. The bottom four ? fasteners on each side do not have the rings and pull out. Eliminates the scratching issue.
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  #14  
Old 07-09-2019, 08:41 AM
j-red j-red is offline
 
Join Date: Dec 2015
Location: Lewes, DE
Posts: 364
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My last plane, a 6a, had screws around the top cowl. Decided that the next would have 1/4 turn fasteners. The problem wasn't a time issue, it was trying to collect all the screws/tinnerman washers without dropping them, and one or two needed to be replaced just about every time the cowl was off. Oh, and inevitably I'd go looking for the screw gun and it would be at home for some reason....

Hinges along the sides, and (retained) skybolts over the top for me.
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  #15  
Old 07-09-2019, 01:19 PM
Sue Sue is offline
 
Join Date: Nov 2012
Location: Ok
Posts: 94
Default Cowling

Phillips head camlocs. Won?t regret it.
At night when you hear the funny noise
Crossing the desert or mountains
And you did not want to take the
Time to unscrew the Cowling to be sure. ?
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  #16  
Old 07-09-2019, 01:35 PM
Perreaum Perreaum is offline
 
Join Date: Mar 2016
Location: Kalkaska, MI
Posts: 6
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My 1958 Cessna has screws and they still hold the cowling together after what must have been hundreds if not thousands of cowl removals and installs. with an electric screw driver it is no problem.
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  #17  
Old 07-09-2019, 01:39 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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My 1955 Cessna has screws. Over time, the holes in the cowl have gradually enlarged, so the recommendation for the Tinnerman recessed washers is a good one. Every once in a while I need to replace one of the Tinnerman nuts (a nutplate will also sometimes wear out) and at least those didn't need riveting.

Installing or removing the cowl is a pain. There are enough screws that it takes a little bit of time. The Cessna has a 6 cylinder Continental, so its cowl is about the size of an RV-10s.

Before he moved it, an RV-8 was in the hangar next door to mine. It used the stock hinges. He had enormous trouble reinstalling his hinge pins, but I don't know why. That made such an impression that I bought a set of the Mil Spec 1/4 fasteners for my RV-3B project.

Dave
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  #18  
Old 07-09-2019, 01:41 PM
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Janekom Janekom is offline
 
Join Date: Jan 2006
Location: South Africa
Posts: 840
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Having built seven RVs - stick to the hinges. Never had a problem
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  #19  
Old 07-09-2019, 07:16 PM
rightrudder rightrudder is offline
 
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Love the SkyBolts. Used them around the firewall perimeter, and hinges for the upper/lower cowl joint. The biggest advantage is that the screws are captive in the bezels, and you never have to worry about a mucked-up nut plate. And on a purely aerospace-is-cool note, these suckers are used on the ISS!

Scratches have never been a problem on the paint. They do scratch up the receptacle mounting plates, but they're bare aluminum and, of course, hidden when the cowling is fitted.
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  #20  
Old 07-09-2019, 08:02 PM
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Danny King Danny King is offline
 
Join Date: Dec 2004
Location: Southlake, Texas
Posts: 626
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Quote:
Originally Posted by Walt View Post
Hinge pins here for the last 15 years, work like a dream, super easy to remove/install cowls. I used screws on the bottom of the cowl and on the front only. Would do the same again if I was to build another.
Oh yea forgot the most important part... they look good!
What Walt said!

The Doll's first flight was 19 years ago this week. My pins and hinges are original and still working great. On the bottom of the cowl on each side to the air ramp I used three #8 button head screws. I used 8 counter sink screws as per plans in the front behind the spinner. When installed correctly, they are easy in, and out. Everything you need comes with the kit at no extra charge.
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