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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Hi Jason,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>The plane I’,
flying is an Extra 330S from PL_Prod (now PLF). I did do front baffling, closed
the cowl hole in front f the carb. So most of the air for the carb is the
cooling air of the engine</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Everybody seems to agree
that the RPM’s are about right. My altitude is about sea level.
Nevertheless, my competition friends “claim”: they are running
5800, this was my reference.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>The headers I’m
using have a length of 310mm, so it seems that I indeed could shorten some and
see if it helps. DA has responded, I’m waiting for the port timing, so I
can rationalize the need for shortening the headers. DA is shipping it’s
standard headers at 305mm.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I have made sure to avoid
a blast in the carb vent hole for sure.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I have always been very
sensitive when turning in the needles, so I don’t think I have damaged
anything.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Still, with the
recommended needle setting I have very poor throttle response in the air, just
far too rich in low to middle, not achieving full power at full. I was thinking
my header length had something to do with it. But now I see, I’m at the standard
length of DA_headers. </span></font><b><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:blue;font-weight:
bold'>So what else could be wrong?</span></font></b></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><b><font size=2 color=blue face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:blue;font-weight:bold'>BTW: </span></font></b></p>
<ul type=disc>
<li class=MsoNormal style='color:blue'><b><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;font-weight:bold'>What
prop are you running, what RPM”s??</span></font></b></li>
<li class=MsoNormal style='color:navy'><b><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:blue;
font-weight:bold'>Total distance to the rear muffler plate? In my
case the MTW TD110k’s add 310 mm to the headers.</span></font></b></li>
</ul>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks!!</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Patrick</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Oorspronkelijk bericht-----<br>
<b><span style='font-weight:bold'>Van:</span></b> JShulman
[mailto:jshulman@cfl.rr.com] <br>
<b><span style='font-weight:bold'>Verzonden:</span></b> maandag 6 februari 2006
23:44<br>
<b><span style='font-weight:bold'>Aan:</span></b> ppandelaers@pandora.be<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> Thoughts about lack of
power of my DA150??</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3 color=blue
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:blue'>Patrick,</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
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<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3 color=blue
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:blue'>What
airplane is this in? What does the cowling look like? Baffles? Carb area? 5600
on a Mej 32x10 sounds about right. One thing you should do is have the low at
no less than 1/2, and the high not less than 2 turns. And when you turn the
needles all the way in, do you make sure they're closed? If so, you can distort
the carb needle seating in the carb making it more difficult to set the needles
correctly. When you close the needles, make sure you do not do it
hard. The only thing with the carb tube I've found is it makes the motor
run leaner. I just make sure not to blast the carb hole in front. I just make a
cover so it can't get direct air through the hole. My headers are 265mm long
and it seems to work well.</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3 color=blue
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:blue'>Hope
this helps.</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3 color=blue
face=Arial><span style='font-size:12.0pt;font-family:Arial;color:blue'>Regards,<br>
Jason<br>
www.jasonshulman.com<br>
www.shulmanaviation.com<br>
www.composite-arf.com</span></font> </p>
</div>
<blockquote style='margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:12.0pt;margin-left:
35.4pt'><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:
Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>PPandelaers<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, February 06, 2006
5:27 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Discussion@Nsrca.Org; Mini IAC
(Mini IAC)<br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion]
Thoughts about lack of power of my DA150??</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Hi guys,</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'>I’m wondering if you have opinions on my below assumptions.
It’s a mail I have sent to DA, but no answer as of yet. </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'>Could I be right, should I rather lengthen or shorten my exhaust
system?</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'>Thanks</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'>Patrick</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'> <font color=navy><span
style='color:navy'>============================================================</span></font></span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>I’m running a DA150
on MTW, short cans TD75K, Mejzlik 28.5x12</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Started running-in the
engine a couple of months ago. >From day 1, I got 5600 RPM.</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Now, 50 liter gas down,
no change at all in RPM </span></font><font size=2 face=Wingdings><span
lang=EN-GB style='font-size:10.0pt;font-family:Wingdings'>L</span></font><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'>
I get exactly the same RPM on a 32x10 2-blade.</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>I’m experiencing
great difficulty in adjusting the engine. I don’t seem to be able to get
full power, particularly not in the air. I get the feeling I don’t even
get the 5600 in the air.</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Tried about anything you
can imagine, with adjusting needles, soldering a little tune on the diaphragm
cap, measuring pressure where it should be done.</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Let’s forget about
air behaviour, I would expect significantly higher RPM, even on the ground.
Motor is not sagging when I keep it running full throttle, I baffled the
engine, cooling is adequate.</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><b><font size=2 color=blue
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:blue;font-weight:bold'>Here’s what I think is going wrong, I would
really like to get your opinion on it.</span></font></b></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=blue
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:blue'>At 5600 RPM, I think I get some refection of the exhaust system
exactly during the intake timing. If this is so, I just can’t get
enough mixture inside the cylinder. </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=blue
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:blue'>At low RPM, it’s always running rich, if I want to improve
that, I have to tweak the “L” as low a 3/8 (instead of the 5/8) .
The high needle is not sensitive at all, it’s like it doesn’t
matter where you put it. With the low, at 3/8, starting a cold engine takes
several restarts.</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 color=blue
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:blue'>The distance of piston to the first wall in exhaust systems is
about 630mm</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:71.4pt;text-indent:-18.0pt'><font size=2
color=blue face=Symbol><span style='font-size:10.0pt;font-family:Symbol;
color:blue'>·<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:blue'>Could I be
right? </span></font></p>
<p class=MsoNormal style='margin-left:71.4pt;text-indent:-18.0pt'><font size=2
color=blue face=Symbol><span style='font-size:10.0pt;font-family:Symbol;
color:blue'>·<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:blue'>How much would
I have to lengthen or shorten the exhaust tubing?</span></font><font
color=blue><span lang=EN-GB style='color:blue'> </span></font></p>
<p class=MsoNormal style='margin-left:71.4pt;text-indent:-18.0pt'><font size=2
color=blue face=Symbol><span style='font-size:10.0pt;font-family:Symbol;
color:blue'>·<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:blue'>Secondary
questions:</span></font><font color=blue><span lang=EN-GB style='color:blue'> </span></font></p>
<p class=MsoNormal style='margin-left:107.4pt;text-indent:-18.0pt'><font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>o<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></font><font
size=2 color=blue face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:blue'>How many degrees is the intake open, </span></font></p>
<p class=MsoNormal style='margin-left:107.4pt;text-indent:-18.0pt'><font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>o<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></font><font
size=2 color=blue face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:blue'>When does the intake open: How many degrees from
exhaust opening (piston moving down) till intake port opens?</span></font><font
color=blue><span lang=EN-GB style='color:blue'> </span></font></p>
<p class=MsoNormal style='margin-left:71.4pt;text-indent:-18.0pt'><font size=2
face=Symbol><span style='font-size:10.0pt;font-family:Symbol'>·<font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 color=blue face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:blue'>What RPM
should I expect on the Mejzlik 28.5x12. </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Your advise would be
highly appreciated!!!</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Patrick</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</blockquote>
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