REFLECTOR: Pressurized Tanks

[Lawrence Epstein,MD]

Does "pressurizing" the tank change the environment of the tank so as to
make it a more or less (or no change) explosive environment?  

 

I do know that there is a difference between av-gas & Jet-A/Diesel.  I
believe that with AV-gas the intent is to maintain a high fuel-vapor
content in the tank.  My hope has been to use a Diesel and with diesel
tanks you need to pressurize the tanks as described in order to keep the
vapor content low.

 

Larry Epstein

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Lynn Gallup
Sent: Wednesday, November 03, 2004 6:34 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Pressurized Tanks

 

John,

I was exaggerating with the word "pressure", I'm sure it is positive but
it must be so slight as to be almost unmeasurable. The key thing is that
with the change the tanks are for sure not under any suction from the
vent line which was why the engine wouldn't draw from them evenly.

Lynn

 

 

/a negative pressuresitvit must be al.  Technicallyx 

----- Original Message ----- 

From: John Dibble <mailto:aminetech at bluefrog.com>  

To: Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders
list 

Sent: Saturday, October 30, 2004 9:32 AM

Subject: REFLECTOR: Pressurized Tanks

 

Not sure I understand your setup, but I like the idea of pressurized
tanks.  I have tank overflow lines that face forward and I could
pressurize my tanks by simply blocking the vent at the manifold (tanks
and sump would still be vented to each other).  Is there any concern of
fatiguing the tanks with repeated pressure cycling? 

John 

Lynn Gallup wrote: 

I had very uneven fuel flow, so uneven, in fact, that one tank or the
other would drain about 3/8 down before the other tank would even start
to flow. I traced this to the mini-naca "scoop" on the bottom of
airplane acting like a venturi and putting suction on the tanks through
the vent line. I laid up a tiny traditionally shaped airscoop, sticking
up just 1/4 inch above the fusilage surface, and glued it on over the
naca scoop. With my now "pressurized" tanks I have not had even the
slightest indication of uneven flow ever since.Lynn 

----- Original Message -----

From: PVTPIL8 at aol.com

To: reflector at tvbf.org

Sent: Thursday, October 28, 2004 11:43 AM

Subject: REFLECTOR: Uneven fuel draw

 I am having a very uneven fuel draw in my XL.  My right tank draws
substantially faster than my left.  I understand others have had this
problem.  I can transfer fuel with pumps.  I would like to know if
anyone has been able to do something to get the fuel to draw more
evenly? 
Steve 
XL-RG 
N787SB 


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