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<DIV><SPAN class=568193614-29042003><FONT face=Arial color=#0000ff size=2>I
should add that the thin wall tube I use is also small in diameter (~3.5mm O.D.
from memory) thus more flexible. You have to really fight to get it on the
clunk and the tube in the bung, but it's flexible enough not to crimp when
doubled over in the tank.</FONT></SPAN></DIV>
<DIV><SPAN class=568193614-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=568193614-29042003><FONT face=Arial color=#0000ff size=2>I
suppose there is a risk the clunk could get hooked up around the vent pipe, but
it's never happened to me yet.</FONT></SPAN></DIV>
<DIV><SPAN class=568193614-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=568193614-29042003><FONT face=Arial color=#0000ff
size=2>Alan</FONT></SPAN></DIV>
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <B>On Behalf Of </B>Bob
Kane<BR><B>Sent:</B> 29 April 2003 13:54<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> RE: Fuel tank<BR><BR></FONT></DIV>
<DIV>I replied before seeing this response, so your question remains unanswered.
I can only tell you my experience and what I did about it.
<STRONG><EM></EM></STRONG></DIV>
<DIV><STRONG><EM></EM></STRONG> </DIV>
<DIV><STRONG><EM>Ihncheol Park <PatternFlyer@msn.com></EM></STRONG>
wrote:</DIV>
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<DIV><SPAN class=834002110-29042003><FONT face=Arial color=#0000ff
size=2>Alan,</FONT></SPAN></DIV>
<DIV><SPAN class=834002110-29042003><FONT face=Arial color=#0000ff size=2>My
reason for the thin-walled tubing is not just for our pattern
flying.</FONT></SPAN></DIV>
<DIV><SPAN class=834002110-29042003><FONT face=Arial color=#0000ff
size=2>Several members of my local clubs gets their plane as high as possible
and start vertical dive with lots of rolls, snaps, spin and whatever they
call. I've seen a few dead sticks with hard straight clunk tubes.
I prefer my engine to keep running unless there is not fuel left in my fuel
tank.</FONT></SPAN></DIV>
<DIV><SPAN class=834002110-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=834002110-29042003><FONT face=Arial color=#0000ff
size=2>Ihncheol Park</FONT></SPAN></DIV>
<DIV><SPAN class=834002110-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]<B>On
Behalf Of </B>Alan Simmonds<BR><B>Sent:</B> Tuesday, April 29, 2003 2:12
AM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> RE: Fuel
tank<BR><BR></FONT></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2>Good Thread! But which is right? </FONT></SPAN></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2>Stop the clunk falling to the front of the tank and potentially
crimping the fuel line</FONT></SPAN></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2>or</FONT></SPAN></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2>Use a thin walled line that will always fall to the front of the
tank.</FONT></SPAN></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2>Does it make any difference with the engine ticking
over?</FONT></SPAN></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff size=2>I
use the thin walled tube myself but would be interested to know which camp
is the majority.</FONT></SPAN></DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652520409-29042003><FONT face=Arial color=#0000ff
size=2>Alan Simmonds</FONT></SPAN></DIV>
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <B>On
Behalf Of </B>Bob Kane<BR><B>Sent:</B> 29 April 2003 04:56<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> Re: Fuel tank<BR><BR></FONT></DIV>
<DIV>Does it quit on the way up, or on the way down? What kind of
engine are you using? </DIV>
<DIV> </DIV>
<DIV>There are at least two possible problems. Your idle setup could be off,
causing the changing fuel flow during this manuever to kill the
engine. The engine should run for a long time at idle with the fuel
remaining in the line even when the clunk is "high and dry" so to speak,
certainly long enough to finish the downline and level off, restoring fuel
flow. The other problem could be a pinched fuel line inside the tank. I
had similar problem, flameouts after a stall turn. I discovered the
clunk would pull the feeder line into the fuel on a downline but the clunk
would stay in the front of the tank, folding the feeder line and starving
the engine of fuel. I now assemble my tanks with an aluminum tube in the
pickup line so the clunk can't fold back on itself.</DIV>
<DIV> </DIV>
<DIV>I would make sure the idle setup on your engine is reliable. It should
idle for a very long time with no change in rpm. Run the engine on the
ground at full throttle, then pull back to idle. If it runs at steady rpm,
all is fine. If it slowly slows down and dies, it is rich. If is speeds up
then dies, it is lean.<BR><BR><B><I>Jerry Wilson
<jerrywil@swbell.net></I></B> wrote:</DIV>
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<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003>I have just found a problem that I'm sure many
people on the list have solved before. Often while doing a
stall turn, my engine would stop and a dead stick landing would
follow. After discussing this with a friend at the field it was
suggested that it could be a fuel tank problem. So I took the tank
out tonight to have a look. With fuel inside I could see that
when the tank was inverted as in a stall turn manouver as you go over the
top, the clunk would often rest against the side of the tank.
So when the nose is pointed down, the clunk could hang at the
aft end of the tank but the fuel is at the nose. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003>I've changed the length of the tubing (shorter
and longer) and even added a wheel collar to the line at the clunk,
but so far I can't tell much difference.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003>Any suggestions would be
appreciated,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003>thanks,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=150564502-29042003>Jerry</SPAN></FONT></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
size=4></FONT> </DIV></BLOCKQUOTE></BLOCKQUOTE><BR><BR>Bob
Kane<BR>getterflash@yahoo.com
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