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From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: return lines
Date: Fri, 13 Jan 2006 00:09:26 -0500
Message-ID: <NMELKLCBIAJLEHHCHLJBIENIFAAA.sladerj@bellsouth.net>
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> For canard builders, I'm guessing you don't want to return to the
> outside.
> Somebody correct me if I'm wrong, but since canards have small
> sumps to cope
> with extended nose-down periods, you'd want to return to the
> sump. Otherwise,
> you'd pump all the fuel out of the sump into the inaccessible
> portion of the
> tank (inaccessible during the extended nose-down period).
>
> Is this correct? I know it's desirable to cool the fuel but
> haven't figured
> out anywhere else for it to go in my Cozy other than right back
> to the sump.

I'm not sure what you mean by "return to the outside" Chad. While it's true
that a certain amount of fuel can be "unported" in a long descent, the tank
level has to be fairly low for that to happen and, if it does happen you'll
probably be aware of the low fuel level and know what happened. A pull up
will refill the sump. My engine runs for about a minute after the last of
the fuel disappears below the sight gauge, so running the return to the sump
would set you up for vapor lock. On balance I think returning to the main
tank/s at the top rear is the best option for a Cozy. I think a transfer
option that permits you to pump all remaining fuel from one tank to the
other will also help with this situation.

Regards,
John