REFLECTOR: FUEL FEED & Vents

[KeithHallsten]

Scott,

That's a pretty good answer to my request for a scenario!  I'll have to
think on it!

Keith


----- Original Message ----- 
From: "Scott Baker" <sbakr at comcast.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Wednesday, February 16, 2005 10:26 PM
Subject: Re: REFLECTOR: FUEL FEED & Vents


> Hello Keith,
>
> Regarding your question:
> >..." I have never been able to identify a situation in which the sump
> > vent would do anything good for you (once the sump tank is filled the
> > first
> > time).  Anyone got a scenario to the contrary?"
>
> I have wondered about a low fuel, prolonged descent with the nose pitched
> down situation where the mains could become "unported".  If this were to
> happen, and if the sump tank were not vented, then air from the displaced
> fuel would be trapped inside the sump tank.  A vented sump tank could
easily
> purge itself and refill with fuel when the aircraft reassumed a level
flight
> attitude.
>
> The likelihood of unporting the fuel supply is not as rare as we might
> think.  My older model C210 for instance, was placarded to warn the pilot
to
> land with at least one-quarter (1/4) tank of fuel to avoid fuel
starvation.
> Cessna designers installed two small "saddle tanks" under the floor of the
> C210A the following model year.
>
> You pose a good question.  It's good to get a lot of clear thinking heads
to
> help brainstorm ideas like this before deciding upon a design change -
> especially to something as important as the fuel system.  I donno.  One
> thing I've learned about aviation is - whatever the imagined unlikely
> event - it's probably going to happen!  Spins in a Grumman with the wrong
> fuel tank selected = flameout.  Point my 1960 C210 downhill with low fuel
=
> flameout.  Many twins call for the selection of the "mains" for takeoff
and
> landing to avoid the possibility of fuel starvation.
>
> Just thinking out loud.
> SB
>
>
>
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