REFLECTOR: Leak testing

[jerry at jlbent.com]

Hopefully I have addressed the balloon issue with the use of a bubble level
as the pressue vessel.  I was think about creating a "barometer" to set up
along side this test rig so that I can compare the ambient temperature and
pressure effect to changes in the test rig.

Does that sound like it would work?


Jerry Brainard
Jerry at JLBEnt.com


   	-------Original Message-------
From: Laurence Coen
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Leak testing
Sent: Jul 07 '11 10:30am


I had trouble with the balloon method because I couldn't find a balloon
that didn't leak.  20" to 30" should be fine and see if it holds pressure.
Just remember that changes in temperature or barometer can run the pressure
up or down.

Larry Coen
N136LC


FROM: [LINK: mailto:nmflyer1 at aol.com] nmflyer1 at aol.com
SENT: Thursday, July 07, 2011 9:55 AM
TO: [LINK: mailto:jerry at jlbent.com] jerry at jlbent.com ; [LINK:
mailto:reflector at tvbf.org] reflector at tvbf.org
SUBJECT: Re: REFLECTOR: Leak testing

Jerry,


 I did the old balloon test. Just to make sure I had a little pressure, I
put one big party balloon inside another, then pumped them up with my air
compressor.  I rubber-banded them onto the fuel lines then added some tape.
Spray the connection with soapy water to check for leaks in the attachment.


This method worked for me as I found two rather small leaks in the outboard
corner near the front of the bulkhead.


There is probably a fancier method of doing it, but this seemed to work.


 Kurt


-----Original Message-----
From: jerry at jlbent.com
To: Velocity Aicraft Owners and Builder list
Sent: Thu, Jul 7, 2011 8:49 am
Subject: REFLECTOR: Leak testing


To the Collective:

I am ready to leak test my tanks and was wondering what pressure is
appropriate.  Obviously, too much is distructive, so I was wonder what
others have used.  I see that the total height of the fuel from the bottom
of the sump to the top of the strake is about 20 inches. Since the wt. of
fuel is about 3/4 of water, to just meet the static fuel pressure would
seem to be about 15".  I have a water column that I use to make the
pressure anything up to about 70 inches of water.  So how far above the
expected 20" of fuel should I test?

Thoughts?


Jerry Brainard
[LINK: mailto:Jerry at JLBEnt.com] Jerry at JLBEnt.com


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