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Date: Wed, 09 May 2007 11:34:08 -0400
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From: "Bill McDonald" <sysder@gmail.com>
Subject: Joe T's fuel system
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Thinking more about Joe T's fuel system.
Excellent way to purge air out of the system. BUT, it is a pretty long pipe
run from the aft baggage to the engine.
How do you get rid of that air? In other words, if the header ever gets
empty for any reason, air purges great up to the header.
Then you have a 7 or 8 ft run of pipe to the engine. How do you purge that
air?
The air will have to go through the engine, and you will get a non start or
a very delayed start. Probably delayed enough
that the wheels will already be decending in rotations as the batteries will
start to pull down. Then you have inertia against you
instead of with you and that is a good way to get a hot start.
Ok, good fuel system if the small header was moved as close to the engine as
possible,
like on the firewall or attached to the engine mount in the FCU area.

Keeping it aft, without a way to purge air from the header to the engine
sounds like BIG trouble to me.

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<div>Thinking more about Joe T&#39;s fuel system.</div>
<div>Excellent way to purge air out of the system. BUT, it is a pretty long pipe run from the aft baggage to the engine.</div>
<div>How do you get rid of that air? In other words, if the header ever gets empty for any reason, air purges great up to the header.</div>
<div>Then you have a 7 or 8 ft run of pipe to the engine. How do you purge that air?</div>
<div>The air will have to go through the engine, and you will get a non start or a very delayed start. Probably delayed enough</div>
<div>that the wheels will already be decending in rotations as the batteries will start to pull down. Then you have inertia against you </div>
<div>instead of with you and that is a good way to get a hot start.</div>
<div>Ok, good fuel system if the small header was moved as close to the engine as possible,</div>
<div>like on the firewall or attached to the engine mount in the FCU area.</div>
<div>&nbsp;</div>
<div>Keeping it aft, without a way to purge air from the header to the engine sounds like BIG trouble to me.</div>
<div>&nbsp;</div>

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