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rexjan(at)bigpond.com
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 Posted: Mon Jan 22, 2007 3:55 pm Post subject: Fuel Pump needed |
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That tank would probaly work great. It would fit on the right seat. Just
need a small transfer pump? JIm
What about a little Facet Pump No 40171 This one has valves both ways so you get no flow in or out when no power to pump.
Rex.
[quote][b]
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Bob
Joined: 24 Oct 2006
Posts: 89
Location: Damascus, Maryland, USA
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| Posted: Tue Jan 30, 2007 7:43 am Post subject: Re: Fuel Pump needed (Facet pump info) |
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I was just looking into the differences between the Facet pumps and came across a great article on research for the Glastar airplanes. The following is copied from http://archives.glastar.org/9909/msg00697.html and I hope that Don doesn't mind my taking up the space to copy it here in case the link someday dies.
Bob
Hey Builders!
I have some information about the Facet fuel pumps used to transfer fuel
in our airplanes. To support the Pillar Point Avionics "Smart Switch"
Fuel Pump Controller, we have tested threee different models of Facet
pump: the 40171, the 40105, and the 40106. The differences fall into
two distinct categories that relate to pump-off forward and reverse
leakage flows.
Physically, the 40105 and 40
The Facet 40171 pump is the type sold by Stoddard-Hamilton Aircraft ,
Inc. (360-495-8533) to serve as a transfer pump for transferring fuel
from the auxiliary tanks to the main tanks. The 40171 costs about $54
each. The Facet 40105 and 40106 are sold by numerous suppliers,
including Aircraft Spruce and Specialties (800-824-1930 (west);
800-831-2949 (east)), Chief Aircraft (800-447-3408), Wicks
(800-221-9425) and others and typically used in the Zenith and other
aircraft for transferring fuel from an aux tank to a header tank. The
40105/6 pumps cost about $28 to $32 each.
Physically, the 40105 and 40106 are identical. Both Chief Aircraft and
Aircraft Spruce picture these pumps in their catalogs. The 40171 looks
slightly different than the 40105 / 40106 models in that the inlet and
outlet ends of the pump are about 1/4 inch longer than the 40105 / 40106
to accommodate the check and foot valves. (I haven't found any pictures
of the 40171.) Functionally, there is a world of difference between the
40171 and the 40105 / 40106.
All three model pumps have a "lift" capability and can draw fuel from
at least 3-feet. All three move the fuel at about 0.5 gal/min, or about
30 gal/h when they are operating.
In the "OFF" state, however, the differences between the pumps become
more obvious. At a 30-inch head pressure, the 40105 and 40106 pumps
have a forward "leak" rate or drain rate of about 15 gal/h. These pumps
thus flow freely in the forward direction at about one-hald the pumping
rate.... In the reverse direction, the 40105 and 40106 drain backwards
at between 0.05 ga/h to about 0.25 gal/hr, with a mean value over a
dozen tests with four different pumps of about 0.1 gal/h. (As a point
of reference, 0.1 gal/h is about one drop per second). Compare these
numbers to the 40171 pump, which showed no detectable leakage in the
"OFF" state in either the forward or reverse directions over several
hours.
The utilization implications are pretty clear: If your "from" tank is
higher that the "to" tank, you need the 40171 pump to prevent your
"from" fuel from draining into your "to" tank. If your "from" and "to"
tanks are at about the same level, you should still use the 40171 pump
to prevent an exchange of fuel. If your "from" tank is lower than your
"to" tank, you can use any of the pumps described, but if you use the
40105 or 40106, you should use a check valve on the outlet side of the
pump to present your "to" tank from draining back into your "from"
tank. Wicks lists a check valve at about $24, so cost-wise the 40171
may represent a better bargin because it has the checks built into
them....
Pillar Point Avionics offers fuel pump controllers for all of these
pumps. For the 40171 pump, PPAv provides the XFR-12-2-5F model
controller; for the 40105 and 40106 pumps, PPAv provides the
XFR-12-2-5G model controller. We developed the "G" model when we found
that the operating characteristics of the 40105 and 40106 were just
different enough from the 40171 to make control of those pumps with the
"F"-model Smart Switch less reliable than we wanted.
If you have a PPAv controller and are building a GlaStar or another
airplane that uses the 40171 pump(s), the original production "F" model
will be just fine. If you have the 40105 or 40106 pumps, you will need
the "G" model controller. If you need the "G" model controller and have
NOT been contacted by PPAv, then please contact me by email at
mailto:ddouglas(at)ppavionics.com or by fax (650-726-9567) or by telephone
(650-740-1516).
You can identify the model by looking at the mounting tab on the pump.
One side of the mounting slot will be stamped "40" and the other side
will be stamped "105", 106" or "171". If you have a different model
pump and want to use the PPAv Smart Switch Fuel Pump Controller to
reduce your aux fuel management workload, please contact us. You can
read about the PPAv Controller at
http://www.ppavionics.com
Dennis Douglas
Pillar Point Avionics, Inc.
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