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<div class=Section1>
<p class=MsoNormal><span class=EmailStyle19><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>I recommend
the 1.20 AX. It will turn a bigger prop, which offers a more efficient HP –
Thrust conversion. I am flying advanced with a 9+lb airplane powered with the
1.20 AX and a 16-10 APC. I am getting away with the 16-10 but I feel I am
pushing the upper limit. It would probably be more comfortable with a 15-10 or
16-8. It is probably more power than needed in lower classes but throttle
management is one of the things we need to learn and the sooner the better,
besides the extra power will be most welcome in adverse weather conditions.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle19><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>Jim Hiller
<span style="mso-spacerun: yes"> </span><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle19><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----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>Shoval Aviv-BAS036<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 26, 2008
10:24 AM<br>
<b><span style='font-weight:bold'>To:</span></b>
nsrca-discussion@lists.nsrca.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion] OS
91FX or 120 AX for Focus sport</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Hi All,</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>I’m
fairly new to pattern flying. I’m considering to buy the Focus sport and want
to “keep it simple” with the engine. I know the Focus was design for YS 110 but
for cost/ simplicity reasons i am considering the OS 91 FX or the OS 120 AX. In
the OS web site they claim that the 120AX is 20% more power but when I compare
efficiency it looks like the 91FX wins. Its 6% more efficient in power to Wight
and 16% more in power to displacement. Am I missing something? Practical RPM
misleading numbers? What would be your recommendation?</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<table border=0 cellspacing=0 cellpadding=0 width=302 style='width:226.3pt;
margin-left:34.85pt;border-collapse:collapse;mso-padding-alt:0in 0in 0in 0in'>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border:solid windowtext 1.0pt;
border-left:none;padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>120AX</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border:solid windowtext 1.0pt;
border-left:none;padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>91FX</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Displacement (Cu in)</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>1.2</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>0.91</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Weight (gr)</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>650</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>550</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Output (BHP@RPM)</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>3.1@9000</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>2.8@15,000</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Cost</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>250</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>200</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>output/ weight</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>0.004769</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>0.005090909</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=133 nowrap height=17 valign=bottom style='width:100.0pt;border:
solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'>Output/ displacement</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=76 nowrap height=17 valign=bottom style='width:57.1pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>2.583333</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
<td width=92 nowrap height=17 valign=bottom style='width:69.2pt;border-top:
none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
<p class=MsoNormal align=right style='text-align:right'><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>3.076923077</span></font><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
</td>
</tr>
</table>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'> </span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Best
Regards,</span></font><font color=black><span style='color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Aviv</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
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