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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cant get too much power.&nbsp; Do the 120.&nbsp; Also, consider replacing
the bearing with the OS1.4 efi bearing and the engine will run great forever.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Shoval
Aviv-BAS036<br>
<b>Sent:</b> Thursday, June 26, 2008 12:24 PM<br>
<b>To:</b> nsrca-discussion@lists.nsrca.org<br>
<b>Subject:</b> [NSRCA-discussion] OS 91FX or 120 AX for Focus sport<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi
All,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I&#8217;m
fairly new to pattern flying. I&#8217;m considering to buy the Focus sport and want
to &#8220;keep it simple&#8221; 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?<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=434
 style='width:217.0pt;margin-left:-1.15pt;border-collapse:collapse'>
 <tr style='height:12.75pt'>
  <td width=200 nowrap valign=bottom style='width:100.0pt;border:solid windowtext 1.0pt;
  padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>&nbsp;<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;border:solid windowtext 1.0pt;
  border-left:none;padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>120AX<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;border:solid windowtext 1.0pt;
  border-left:none;padding:0in 5.4pt 0in 5.4pt;height:12.75pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>91FX<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Displacement
  (Cu in)<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>1.2<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.91<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Weight
  (gr)<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>650<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>550<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Output
  (BHP@RPM)<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>3.1@9000<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>2.8@15,000<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Cost<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>250<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>200<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>&nbsp;<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>&nbsp;<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>&nbsp;<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>output/
  weight<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.004769<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>0.005090909<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:12.75pt'>
  <td width=200 nowrap 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><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Output/
  displacement<o:p></o:p></span></p>
  </td>
  <td width=96 nowrap valign=bottom style='width:48.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>2.583333<o:p></o:p></span></p>
  </td>
  <td width=138 nowrap valign=bottom style='width:69.0pt;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'><span
  style='font-size:10.0pt;font-family:"Arial","sans-serif"'>3.076923077<o:p></o:p></span></p>
  </td>
 </tr>
</table>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Best
Regards,</span><o:p></o:p></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Aviv</span><o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

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