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Hey Jim,
<BR>I'm with you on this one! You know those Dave Brown CA Applicators,(
the semi- transparent ones). I think if you could get one the same size
with a tube molded into the opposite end so that it now has an inlet and
an outlet tube you could stick it in the line right at the carb you would
be bullet proof. Shouldn't be all that difficult for the mfgr. to draw
some up and market same. I'd call it "The Belch Squelch".
<BR>Georgie
<P>Jim_Woodward@beaerospace.com wrote:
<BLOCKQUOTE TYPE=CITE>
<BR><FONT FACE="sans-serif"><FONT SIZE=-1>I'll take a stab as why the hopper
tanks work. Liquid may be incompressible, but it is "movable".
The hopper tank has a fuel entry and exit point. Exit point being
the clunk line that goes to the engine, entry point being the vent line.
The hopper tank becomes a reservoir of fuel. Although I think you
can argue that the entry and exit point fuel velocity (or suction force)
is the same, this cannot be said for the middle of the tank were the suction
force is diffused over a larger volumetric cross section. The image
in my mind is a wind tunnel's stilling chamber. I think an interesting
question would be this: How small can a hopper tank be to still provide
the ease of fuel draw we are looking for? Can the hopper tank be
reduced to a section of fuel tubing that is "bubbled"? Would the
"bubble" work is there was a separate entry and exit point like the ven
t and clunk lines of the hopper tank? If the bubble was 5 times larger
than the ID of fuel tubing would it work?</FONT></FONT>
<BR><FONT FACE="sans-serif"><FONT SIZE=-1>Thanks,</FONT></FONT>
<BR><FONT FACE="sans-serif"><FONT SIZE=-1>Jim W.</FONT></FONT>
<BR>
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<TD><B><FONT FACE="sans-serif"><FONT SIZE=-2>ronlock@comcast.net</FONT></FONT></B>
<BR><FONT FACE="sans-serif"><FONT SIZE=-2>Sent by: discussion-request@nsrca.org</FONT></FONT>
<P><FONT FACE="sans-serif"><FONT SIZE=-2>08/13/2004 08:34 AM</FONT></FONT>
<BR><FONT FACE="sans-serif"><FONT SIZE=-2>Please respond to discussion</FONT></FONT> </TD>
<TD><FONT FACE="Arial"><FONT SIZE=-2> </FONT></FONT>
<BR><FONT FACE="sans-serif"><FONT SIZE=-2>
To: discussion@nsrca.org, discussion@nsrca.org</FONT></FONT>
<BR><FONT FACE="sans-serif"><FONT SIZE=-2>
cc: Jerry Budd <jbudd@QNET.COM></FONT></FONT>
<BR><FONT FACE="sans-serif"><FONT SIZE=-2>
Subject: Re: hopper theory &
practice</FONT></FONT></TD>
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<P><FONT FACE="Times New Roman"><FONT SIZE=+0>Ive been a hopper tank diss-believer
for years. I also wonder why many continue to report benefits.
What's responsible for the benefit?</FONT></FONT>
<P><FONT FACE="Times New Roman"><FONT SIZE=+0>I'm in agreement with Nat,
and what "I think" Jerry has said regarding the fuel system with a FULL
hopper tank being a column of fluid, and the hopper would have no benefit.</FONT></FONT>
<P><FONT FACE="Times New Roman"><FONT SIZE=+0>Maybe hopper serves to eliminate
foaming and bubbles? Do I understand heli pilots use hoppers for
that reason?</FONT></FONT>
<P><FONT FACE="Times New Roman"><FONT SIZE=+0>In practice do we usually
have some air in the hopper? Or do we usually have a hopper
tank that is flexible? Might we be drawing from the hopper
without replenishing from the main tank during a vertical?
Then the hopper gets replenished during level lines?</FONT></FONT>
<P><FONT FACE="Times New Roman"><FONT SIZE=+0>Still wondering, Ron Lockhart</FONT></FONT>
<P><FONT FACE="Times New Roman"><FONT SIZE=+0>-------------- Original message
--------------</FONT></FONT>
<P><FONT FACE="Times New Roman"><FONT SIZE=+0>> >Matt,</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> >With or without the hopper
tank we still have a solid column of</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> >incompressible fluid
for gravity and G's to play its tricks on. I</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> >contend if it runs ok
with the hopper it will run just as well</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> >without. Nat</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>></FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> Nat,</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>></FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> While not exactly accurate
as stated, your point is well taken. Your</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> hypothesis has some merit
when the tank is full, but it falls short</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> anytime else (which is
most of the flight). Adding just a small</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> amount of air causes the
system to become compressible (just like the</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> brakes on your car).</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>></FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> Jerry</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> --</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> ___________</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> Jerry Budd</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> <A HREF="mailto:jbudd@qnet.com">mailto:jbudd@qnet.com</A></FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> =====================================</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> # To be removed from this
list, go to <A HREF="http://www.nsrca.org/discussionA.htm">http://www.nsrca.org/discussionA.htm</A></FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>> and follow the instructions.</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=+0>></FONT></FONT></BLOCKQUOTE>
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