REFLECTOR: FUEL FEED

[Chuck Jensen]

John,
 
The logic of your logic seems good, but the question I have is why the recommended location of the vent is at the rear of the tank (true?).  This vent area will always be covered up during climb with full tanks, potentially causing some, if only temporary, venting issues.  It would seem more appropriate to put the vent connection near the front of the tank, so it will be unported during climbs.  Later, during descent to land, the tank fuel level is lower and the AOA is near level, so a vent connection at the front of the tank is likely to stay unported.  With all that said, there must be a reason why the recommendation is to put it at the back of the tank.  Anyone know?
 
Chuck
 
 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On Behalf Of John Dibble
Sent: Monday, February 21, 2005 11:07 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: FUEL FEED


Jim, 
I like your analysis of the vents getting flooded during a climb.  I think this explains why I only get uneven flow at high altitudes.  Because, I only fly high for long trips and I only have my tanks full for long trips.  I think my forward facing overflow vents provide enough pressure to flush out the vents once the fuel level goes down. 

John 


Jim Sower wrote: 



  

Highest point in the tank varies considerably with airplane attitude.  Most vents are to aft inboard corner of strake.  In a climb, a point about a little aft of the forward most point of the strakes will be several inches higher than the aft corner.  That means several (3"?) of fuel in the vent line.  A LOT of chatter recently on the Cozy list.  Consensus was:  if you want acceptable venting at full fuel you need two separate vents for each tank - one at aft inboard corner, another a couple of feet further forward.  One or the other will be

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