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Subject: RE: [FlyRotary] Re: Fuel System Design - Jet Pump
Date: Mon, 14 Feb 2005 20:02:11 -0600
Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CB5CE@MAIL01.austin.utexas.edu>
Thread-Topic: [FlyRotary] Re: Fuel System Design - Jet Pump
Thread-Index: AcUTAgIVh0MIraLZQHiQoyq1vRRkRQAAFqLF
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

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George,=20
It is a little venturi type pump that was mentioned in the article Ed =
referenced earlier today.  It operates off of some bypass fuel from the =
main fuel pump.  It is used to transfer fuel from one sump to another in =
Ford cars/trucks.

I'm at home now so I don't have the URL handy.  If you can't find it, =
let me know and I'll post it again tomorrow, if Ed doesn't beat me to =
it. =20

Mark S. =20


-----Original Message-----
From: Rotary motors in aircraft on behalf of George Lendich
Sent: Mon 2/14/2005 8:01 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel System Design - Jet Pump
=20

  Mark/Ed,
  What's a Jet pump?
  George ( down under)

  Good Idea, Mark

  I think that people get pretty hung up and adamant about certain =
things - even though they may indeed work. While all fuel systems =
clearly require careful design and construction attention, some appear =
to require even more scrutiny.  What I think sometimes gets folks in =
trouble is they "copy" a design they have seen/hear works.  However, =
they seldom ever copy the design faithfully either due to =
space/configuration constraints - or they have an "improvement" to it.  =
The bottom line is the system has changed, "Yes, Virginia, it may really =
matter as to whether the pickup is at the top vs the bottom, etc. ".

  Even Tracy's system can byte you if you are not careful.  You must pay =
attention to fuel transfer or you can end up with the return fuel =
pushing out the vent of the return tank.  So while I do believe his =
design eliminates (or certainly diminishes the chance of vapor lock) - =
you now must carefully monitor how much fuel is in the return tank.  I =
believe Tracy uses a facet pump to move fuel from one tank to the other =
- which even though unlikely, could fail leaving fuel unavailable.  I =
would have to agree though that scenario certainly would leave you a bit =
more time to consider your options - than a faltering engine on take =
off.=20

  But, yes, it would appear that the "jet pump" might indeed be a =
replacement for the facet pump.  Interesting concept.

  Ed A =20
    ----- Original Message -----=20
    From: Mark R Steitle=20
    To: Rotary motors in aircraft=20
    Sent: Monday, February 14, 2005 4:40 PM
    Subject: [FlyRotary] Fuel System Design - Jet Pump


    Ed,=20

    Thanks for that excellent article on fuel system design.  In reading =
through it, on page 5, I came to the description of the jet pump and had =
a thought (that alone is a scary thing).  I was thinking that this could =
be used to eliminate the need for the facet pump in a design such as =
Tracy's which would simplify things even more than Tracy's system =
already does.  Of course, as in Tracy's design, this would eliminate the =
need for the fuel selector valve too.  As it was designed to do, the Jet =
Pump would be powered by excess fuel from the main fuel pump located in =
the left tank.  Fuel from the other (right) wing tank would be drawn =
into the main (left) tank by the Jet Pump.  To prevent overfilling the =
main tank, transfer could be controlled by a small solenoid valve.  =
Since you would be drawing fuel from the right tank pretty much all the =
time, it may be possible to route the return fuel to the right tank.  I =
guess this idea could also be used with a sump tank.  Time for a sanity =
check. =20

    =20

    Mark S.   =20

    =20


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