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Fuel Leak
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wcurtis(at)nerv10.com
Guest

Posted: Tue Jun 12, 2007 9:55 am Post subject: Fuel Leak

And to further complicate matters, the simpler H2O molecule is heavier (more mass at 8 pounds per gallon) than the more complex gasoline (C8H18) hydrocarbon molecule at 6 pounds per gallon.  As far as the physical size of one molecule verses another, in the units we are talking about it really insignificant.  Now if I was building filters for biomedical of respiratory systems, that would be another story.  Another interesting thing about H2O is that it is one of the rare compounds in nature that expands and gets lighter as it gets colder.  Ice takes up about 10% more volume than water.  Most everything else shrinks and gets heavier as they get colder.



William

http://wcurtis.nerv10.com/ 



------

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flywithowen(at)gmail.com
Guest

Posted: Tue Jun 12, 2007 10:36 am Post subject: Fuel Leak

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t_agold(at)yahoo.com
Guest

Posted: Tue Jun 12, 2007 12:56 pm Post subject: Fuel Leak

I'm no MIT grad, but a 12 inch column of gasoline is about 0.31 psi. Applying more pressure may actually cause problems.  A gas is much harder to seal than a liquid due to surface tension and the size of the molecule.  I just finished my tanks, but have not tested them yet.  I plan on using the balloon/soapy water test.  It's cheap and effective.  I just don't see the need for more complex methods.

   

  Todd #362



"RV Builder (Michael Sausen)" <rvbuilder(at)sausen.net> wrote:

  [quote]      v\:* {behavior:url(#default#VML);}  o\:* {behavior:url(#default#VML);}  w\:* {behavior:url(#default#VML);}  .shape {behavior:url(#default#VML);}                  What if one of you smart MIT types *cough*  figure out about how much PSI a full tank of avgas exerts while compensating for the difference in viscosity between air and avgas.  Should give you a better number to use to approx the PSI of air for testing the tanks.  Hopefully it will lead to more accurate leak tests.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

   

  Just a thought.  

   

  Michael

  Do not archive

   

      From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of JSMcGrew(at)aol.com

Sent: Sunday, June 10, 2007 6:12 AM

To: rv10-list(at)matronics.com

Subject: Fuel  Leak

   

    I know we just had this discussion about a leaky rivet on a fuel tank. I didn't comment because I thought I was the lucky recipient of leak-free quickbuild tanks. You'll notice from the attached photo that I was not. Seeing that did not make me happy.



     



    Last August I pressure tested my tanks using a pressure gauge from a blood pressure cuff before installing them. I pumped them up to 35 mmHG (~ 0.67 psi) and left them for 2-3 days. The pressure did not change so I figured they were good. After filling them  I checked for leaks and didn't see any. I've had fuel in the tanks for 10 months and flown 85 hours. As I was washing the bugs off my wing yesterday I found this leak. I'm glad I found it before painting.



     



    I plan on emptying the fuel from the wing and trying the Locktite 290 approach, unless someone has a better suggestion.



     



    -Jim



    40134



     



    Jim "Scooter" McGrew

http://www.mit.edu/~jsmcgrew 



  

        

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ScooterF15

Joined: 19 Jun 2006
Posts: 136

Posted: Tue Jun 12, 2007 1:24 pm Post subject: Fuel Leak

Yes, Todd, but that is at 1 G. Now what if you're pulling 3.8 Gs... it's  1.2 psi... never mind... it doesn't matter... You're right. Keep it  simple.

  

 -Jim

  

 In a message dated 6/12/2007 4:58:42 P.M. Eastern Daylight Time,  t_agold(at)yahoo.com writes:

  	  Quote: 	
		     I'm no MIT grad, but a 12 inch column of gasoline is about 0.31    psi. Applying more pressure may actually cause problems.  A gas is    much harder to seal than a liquid due to surface tension and the size of    the molecule.  I just finished my tanks, but have not tested them    yet.  I plan on using the balloon/soapy water test.  It's cheap and    effective.  I just don't see the need for more complex methods.

    

   Todd #362



	


 [/url] 





See what's free at [url=http://www.aol.com?ncid=AOLAOF00020000000503]AOL.com. 

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