REFLECTOR:Low fuel light
KeithHallsten
reflector@tvbf.org
Sat, 26 Jul 2003 16:17:27 -0700
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Bob,
Thanks for the data point! Your analysis seems logical to me, except =
that reduced indicated airspeed is LOWER pressure in the vent line =
(provided that the vent opening faces forward, somewhat like a pitot =
tube). If the vent line doesn't face forward, maybe the slight nose-up =
attitude at higher elevations is enough to increase the (relative) =
pressure on the bottom of the fuselage, where the vent inlet is located. =
Either way, if we applied some positive pressure to the strake tanks =
that we did NOT apply to the sump tank, it would help to keep the sump =
tank full!
Keith
=20
----- Original Message -----=20
From: SlvEgl99@aol.com=20
To: reflector@tvbf.org=20
Sent: Saturday, July 26, 2003 3:22 PM
Subject: Re: REFLECTOR:Low fuel light
On my XL, the only time I ever see any low fuel flashing light is at =
10,500 feet or so. That has happened twice, once over Southern =
California going over the mountains, and once here in Florida seeking a =
way past a thunderstorm. In both cases I was at cruise, but obviously =
had an increased angle of attack due to thin air at altitude (or so I =
thought). The warning light would flash on for a second then be off for =
5-10 seconds then flash again. As soon as I started a descent the light =
remained off.
I attrubuted this to "mushing along" a bit at high altitude and =
reduced air speed causing high pressure on the vent line. Maybe just a =
stupid thought, but it gave me confidence to remain at that altitude and =
complete the flight that I wanted to.=20
Bob Wood
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<DIV><FONT face=3DArial size=3D2>Bob,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks for the data point! Your =
analysis=20
seems logical to me, except that reduced indicated airspeed is LOWER =
pressure in=20
the vent line (provided that the vent opening faces forward, =
somewhat like=20
a pitot tube). If the vent line doesn't face forward, maybe the =
slight=20
nose-up attitude at higher elevations is enough to increase the =
(relative)=20
pressure on the bottom of the fuselage, where the vent inlet is =
located. =20
Either way, if we applied some positive pressure to the strake tanks =
that we did=20
NOT apply to the sump tank, it would help to keep the sump tank=20
full!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Keith</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3DSlvEgl99@aol.com =
href=3D"mailto:SlvEgl99@aol.com">SlvEgl99@aol.com</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, July 26, 2003 =
3:22=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: REFLECTOR:Low fuel =
light</DIV>
<DIV><BR></DIV><FONT face=3Darial,helvetica><FONT lang=3D0 =
face=3DArial size=3D2=20
FAMILY=3D"SANSSERIF">On my XL, the only time I ever see any low fuel =
flashing=20
light is at 10,500 feet or so. That has happened twice, once over =
Southern=20
California going over the mountains, and once here in Florida seeking =
a way=20
past a thunderstorm. In both cases I was at cruise, but obviously had =
an=20
increased angle of attack due to thin air at altitude (or so I =
thought). The=20
warning light would flash on for a second then be off for 5-10 seconds =
then=20
flash again. As soon as I started a descent the light remained =
off.<BR><BR>I=20
attrubuted this to "mushing along" a bit at high altitude and reduced =
air=20
speed causing high pressure on the vent line. Maybe just a =
stupid=20
thought, but it gave me confidence to remain at that altitude and =
complete the=20
flight that I wanted to. <BR><BR>Bob Wood</FONT>=20
</FONT></BLOCKQUOTE></BODY></HTML>
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