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Fuel bushing re-think

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rnewman(at)tcwtech.com
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Posted: Sat Dec 08, 2007 2:03 pm Post subject: Fuel bushing re-think

Today I went to make the fuel lines that run under  the front seats and I've decided my previous approach using bulkhead fittings at  the tunnel and at the wing root would be a mistake.    Earlier in  the week I posted some pictures on our web site of machined aluminum bushings I  made to allow the use of bulkhead style fittings at the tunnel and at the wing  root.    Well, as I got into the tube installation I found that  tunnel area was a lot stiffer than I really appreciated and I became  increasingly concerned about the straight run of tubing issue between two stiff  bulkheads.    However,  I still wanted to use the bulkhead  fittings at the tunnel so I looked into what options I had at the wing  root.    I found that I could push a bulkhead fitting thru the  rubber grommet that comes with the kit.   So this is what I've decided  to use.   I put the grommet in the fuselage wall first and then ran a  1/2" drill bit thru the opening,  then installed the bulkhead  fitting.   Now there is compliance in this of the fuel  line.     Comments appreciated.

  

  Picture attached.

  

 Bob Newman

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rnewman(at)tcwtech.com
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Posted: Sun Dec 09, 2007 3:52 am Post subject: Fuel bushing re-think

Bill,   I think that what you suggested  is the most straight forward way to run the lines (from the tunnel to the wing)  except that then there is a stub of aluminum tubing sticking out of the side of  the fuselage just asking to get bent over and ruined up till the wings are  attached.   I know I would end up wrecking it.    So  that drove my decision to have a bulkhead ftg at the wing root.

  

 -Bob

   [quote][b]

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jesse(at)saintaviation.co
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Posted: Sun Dec 09, 2007 6:08 am Post subject: Fuel bushing re-think

Bob,

The beauty of just having a fitting at the tunnel and going straight from there to the tank is that you can fit the line more or less, and then remove it until you are ready to install the wing.  Then it isn't in the way and in danger of being messed up.  That is one of the reasons I don't like the plans version because once you get the line fit and run inside the tunnel, it is almost impossible to remove.  The one bulkhead fitting solves this problem.



do not archive



 Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com (jesse(at)saintaviation.com)

Cell: 352-427-0285

Fax: 815-377-3694



 



On Dec 9, 2007, at 6:51 AM, Bob-tcw wrote:

 	  Quote: 	
		  Bill,   I think that what you suggested is the most straight forward way to run the lines (from the tunnel to the wing) except that then there is a stub of aluminum tubing sticking out of the side of the fuselage just asking to get bent over and ruined up till the wings are attached.   I know I would end up wrecking it.    So that drove my decision to have a bulkhead ftg at the wing root.

 

-Bob

 	  Quote: 	
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 [quote][b]

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Sun Dec 09, 2007 6:39 am Post subject: Fuel bushing re-think

Jesse, I didn't install a bulkhead fitting at the tunnel. I went with 

the grommet, but I did terminate the fuel line midway under the seat so 

that  it should be a little easier to attach the final section to the 

wing. (I'll let you know how that works in a couple of days)

http://deemsrv10.com/album/Sec%2037%20Fuel%20System/slides/DSC02804.html



Deems Davis # 406

'Its all done....Its just not put together'

http://deemsrv10.com/



Jesse Saint wrote:

 	  Quote: 	
		   Bob,



 The beauty of just having a fitting at the tunnel and going straight 

 from there to the tank is that you can fit the line more or less, and 

 then remove it until you are ready to install the wing.  Then it isn't 

 in the way and in danger of being messed up. 

 *

 *

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MauleDriver(at)nc.rr.com
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Posted: Sun Dec 09, 2007 8:14 am Post subject: Fuel bushing re-think

MauleDriver wrote: [quote]    We are definitely on the same page on that point...if I can't just figure out how to keep those steps from wrecking my shins.  (I know there are solutions - but I'm having some shin-kill stickers made up).

   

 Thanks Bob - just wanted to check.

   

 Bill (do not archive) Watson

   

   

 Bob-tcw wrote:    	  Quote: 	
		                      Bill,   I think that what you suggested is the most straight forward way to run the lines (from the tunnel to the wing) except that then there is a stub of aluminum tubing sticking out of the side of the fuselage just asking to get bent over and ruined up till the wings are attached.   I know I would end up wrecking it.    So that drove my decision to have a bulkhead ftg at the wing root.

      

     -Bob

      	  Quote: 	
		  



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 [b]

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