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Lower Cowling attachment

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Tue Jan 13, 2009 6:08 pm Post subject: Lower Cowling attachment

Another builder and myself are approaching the point of installing the engine. We want to install the cowl flanges and hinges first. We are aware of the issue with the eyelets on the hinges breaking on the bottom of the cowl, so we have both decided to use a flange/screw and nut-plate arrangement.



The question is this....  In a recent post someone mentioned that they used .063 aluminum plate to support the bottom of the cowling. That is awfully heavy metal, but maybe that is what is called for in this location.



I also see that Deems has used some kind of aluminum flange with 3 nut-plates on each side. I also think that Tim Olsen did not use the hinge on the bottom of the cowl. But I cannot see the pic on his site. 



If anyone (or hopefully several) of you can give some insight here it would be graciously appreciated

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Q/B - sold.

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Tue Jan 13, 2009 6:25 pm Post subject: Lower Cowling attachment

Hi Mike,



I have hinge stuff on these pages:

http://www.myrv10.com/N104CD/fuselage/20050821/index.html

http://www.myrv10.com/N104CD/finishing/20050905/index.html

http://www.myrv10.com/N104CD/finishing/20050911/index.html



I don't think that .063 is needed for greater support.  Basically,

depending on how you attach everything, and what your actual cowl

thicknesses are, you're just trying to find a thickness of metal

that allows you to get the cowl to fit flush to the bottom of the

fuselage.  In my case I can't remember what I used, but it added

up to some thicker material.  I didn't use any shims, if I

remember right...just that material, and I attached some metal

to the cowl and metal to the plane.  It really all just depends

on how you want to make it.  Just make it come out so the cowl

is flush, and you have a few screws holding it all instead of

hinges with eyelets and you'll be fine.

Tim Olson - RV-10 N104CD - Flying

do not archive

AirMike wrote:

 	  Quote: 	
		   

 

 Another builder and myself are approaching the point of installing

 the engine. We want to install the cowl flanges and hinges first. We

 are aware of the issue with the eyelets on the hinges breaking on the

 bottom of the cowl, so we have both decided to use a flange/screw and

 nut-plate arrangement.

 

 The question is this....  In a recent post someone mentioned that

 they used .063 aluminum plate to support the bottom of the cowling.

 That is awfully heavy metal, but maybe that is what is called for in

 this location.

 

 I also see that Deems has used some kind of aluminum flange with 3

 nut-plates on each side. I also think that Tim Olsen did not use the

 hinge on the bottom of the cowl. But I cannot see the pic on his

 site.

 

 If anyone (or hopefully several) of you can give some insight here it

 would be graciously appreciated

 

 -------- OSH '08 or Bust (busted) be there in &quot;09 Q/B Kit -

 wiring and FWF

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p 24639#224639

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Jim Berry

Joined: 10 Jan 2006
Posts: 237
Location: Denver

Posted: Tue Jan 13, 2009 6:32 pm Post subject: Re: Lower Cowling attachment

The original hinge material was 0.063". Using a flange of the same thickness makes it easier to maintain cowl to fuselage alignment.



Jim Berry

40482

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Dave(at)AirCraftersLLC.co
Guest

Posted: Tue Jan 13, 2009 8:48 pm Post subject: Lower Cowling attachment

Mike,



I replaced my broken hinges with .063 sheet of the same dimensions as the

two hinge halves pinned together, about 2" x 6".  The sheet is riveted to

the horizontal return at the bottom of the firewall, exactly like the hinge

was.  I have three nutplates in the sheet to support the aft end of the

cowl.  The hinge half on the cowl was removed, and now the cowl screws

directly to the sheet.



The hinges cracked out at about 50 hours.  We've got 306 hours as of today

and the new attach is working fine.



Soon after the hinges went away, the vertical center support also cracked.

That got duplicated in .063 (I think it was originally .032).  So far so

good with that one too.



Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA 

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com





--

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planesmith(at)hotmail.com
Guest

Posted: Tue Jan 13, 2009 9:14 pm Post subject: Lower Cowling attachment

Hi Mike C



I did the same as been echoed by others. There are some pictures and info at the bottom of my blog: http://www.aviationstop.com/



Vern Smith (#324 finishing)



[quote] Subject: Lower Cowling attachment

 From: Mikeabel(at)Pacbell.net

 Date: Tue C 13 Jan 2009 18:08:46 -0800

 To: rv10-list(at)matronics.com

 

 --> RV10-List message posted by: "AirMike" <Mikeabel(at)Pacbell.net>

 

 Another builder and myself are approaching the point of installing the engine. We want to install the cowl flanges and hinges first. We are aware of the issue with the eyelets on the hinges breaking on the bottom of the cowl C so we have both decided to use a flange/screw and nut-plate arrangement.

 

 The question is this....  In a recent post someone mentioned that they used .063 aluminum plate to support the bottom of the cowling. That is awfully heavy metal C but maybe that is what is called for in this location.

 

 I also see that Deems has used some kind of aluminum flange with 3 nut-plates on each side. I also think that Tim Olsen did not use the hinge on the bottom of the cowl. But I cannot see the pic on his site. 

 

 If anyone (or hopefully several) of you can give some insight here it would be graciously appreciated

 

 --------

 OSH '08 or Bust (busted) be there in &quot;09

 Q/B Kit - wiring and FWF

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=224639#224639

 

 

 

 

========================Windows Live™: Keep your life in sync.  See how it works.   	  Quote: 	
		  [b]

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Tue Jan 13, 2009 10:01 pm Post subject: Lower Cowling attachment

Thank you so much Tim, Dave and Jim. I cannot tell you how grateful I am that you and other builders are out there to help us newbies through the building process. From your efforts and others on this site we will have better built and safer airplanes.

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_________________
See you OSH '18
Q/B - sold.

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