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<DIV><FONT face=Arial color=#0000ff><SPAN class=070433513-03122002>Troy
</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff><SPAN
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<DIV><FONT face=Arial color=#0000ff><SPAN class=070433513-03122002>Great and
very informative write up - thanks from rest of us. </SPAN></FONT><FONT
face=Arial color=#0000ff><SPAN class=070433513-03122002>Yes, you are completely
correct with limiting of the engine RPMs - the cam has a completely
different shape it is pointy at the peak giving a quick response thus the feel
of a tractor (high torque) pull, but because of that you cannot run it at high
RMPs (but then you really do not need to be at the max RPM too
often <G>). </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff><SPAN
class=070433513-03122002></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff><SPAN
class=070433513-03122002>Wojtek</SPAN></FONT></DIV></FONT></DIV>
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<DIV><FONT face="Geneva, Arial, Sans-serif" size=1>The engine seems to have a
timing that like torque and big props....On the ground many of the props in
the proper load range run close to the same RPM but in the air they really are
different and to motor responds different. The best props we have found are
the 16.5-12W APC this is superb for high elevations and windy
conditions..... the 17-12 APC is a great prop also but up here where I fly at
6000ft it is just a little too much load...and during high winds I liked the
16.5-12W better....These props are both able to run in the noise limits for
messing around the 16-12 APC works like a missile but is too much speed and
noise. DON't run the motor up in the 9000's it is not timing wise setup for
these higher Rpms....Keep it above 8000 and below about 8800 these two props
above do just that. The 16-12 will push to top of the 88700-8800 the 16.5-12W
is a good one in the 8400-8600 and the 17-12 reaches the 8100-8200
range....depends on your style of flying the plane.....Planes really dictate
the prop selection not the motor.. A heavier plane will like the smaller
diameter with its quicker acceleration the lighter planes will like the bigger
diameter as they can accelerate the light planes quicker....</FONT></DIV>
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<DIV><FONT face="Geneva, Arial, Sans-serif" size=1>I hope this helps
understand what's going on in the motor...This knowledge lets you know why the
heli fuel is used and why the motor doesn't like rich mixture.</FONT></DIV>
<DIV><FONT face="Geneva, Arial, Sans-serif" size=1></FONT> </DIV>
<DIV><FONT face="Geneva, Arial, Sans-serif" size=1>Troy
Newman</FONT></DIV></SPAN></FONT></FONT></STRONG></DIV><BR clear=all><BR>
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