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<DIV><FONT size=2>let us know the results. Good luck.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=hmetzger@alternex.com.br href="mailto:hmetzger@alternex.com.br">Hugo
Henriques</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, April 05, 2003 6:43
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: YS 91 AC Adjustment
Problems.</DIV>
<DIV><BR></DIV>
<DIV>
<DIV><FONT face=Arial size=2>Hi Terry,</FONT></DIV>
<DIV><FONT face=Arial size=2>Seems like I was setting the slow speed wrong. I
was considering that turning the slow speed needle in would make the engine
leaner, and just find out that it is just the opposite. As you recommended,
I'll try from the start and change the nitro content.</FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks for the big help,</FONT></DIV>
<DIV><FONT face=Arial size=2>Fausto</FONT></DIV></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tbrox@cox.net href="mailto:tbrox@cox.net">Terry Brox</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, April 05, 2003 3:30
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: YS 91 AC Adjustment
Problems.</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>I have had better experience running at least 25% nitro,
and prop the engine to run around 9000 rpm. Also remember, to lean the low
spead needle, you turn the screw out. It is an airbleed adjustment. Good
luck, Terry</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=hmetzger@alternex.com.br
href="mailto:hmetzger@alternex.com.br">Hugo Henriques</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, April 04, 2003 10:47
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> YS 91 AC Adjustment
Problems.</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hi,</FONT></DIV>
<DIV><FONT face=Arial size=2>I've just installed a brand new YS 91AC in a
Midwest Little Cap and started facing some problems. The engine was
properly broke in and really performed well in the test stand. As it was
installed in the model for flight (the fuel tank was tested before and
after this experience) I noticed that the mid range was "very rich" as the
engine would take a lot of time to reach full speed. I turned in the low
speed needle valve but didn't feel any performance increase, so I decided
to turn in the pump screw in. I turned the pump screw in almost two turns,
as the engine showed an imediate response from low speed to high speed.
Anyway, the low speed still needed some fine tuning but again I didn't
feel any difference turning the low speed neddle valve in or out, unless
it was fully closed. Afterwards, I decided the engine was running well for
a test flight. I set the high speed needle valve to a slight rich setting
and took off. The engine acelerated weel on the take off, but after a few
turns on the sky and a cuban eigth with reduced throtle on the dives the
engine wouldn't accelerate imediately and sounded lean. In these
ocasions I backed the throtle and acelerated again with no problems, but
now the engine took more time to reach full speed and sounded richer than
the set up made on the ground. My experience with YS engines
refers to a 120 AC that ran beautifully rigth out of the box, with
adjustments made only on the high speed needle valve as these engine
doesn't have a low speed needle valve. I'm using an OS F glow plug and
Wildcat fuel with 10% nitro/ 18% oil. If anyone can help me with
commentes, specially for the slow speed neddle valve that doesn't seems to
affect the way the engine works, or even a personal setting for
the engine I'll be more than glad. I almost forgot to mention that I
recently installed the same engine in a GP U Can Do 3D with another fuel
tank, fuel lines and YS Check Valve. The problem persists.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks in advance,</FONT></DIV>
<DIV><FONT face=Arial size=2>Fausto -
Brazil</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>