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Jeff Roy
New member
Username: Jeffr

Post Number: 65
Registered: 03-2001

Rating: N/A
Votes: 0

Posted on Monday, November 25, 2002 - 03:03 pm:   
Russ or Loren,

How were those numbers derived?

I have a copy of the US Sailing Performance Package for a "stock" 9.1 and the polars in it are quite different.

This is what they list as "optimum"

<table>
<tr>
<td>
<div>
Upwind</div>
</td>
</tr>
<tr>
<td>True Wind Speed</td>
<td>Boat Speed</td>
<td>True Wind Angle</td>
<td>Appnt Wind Speed</td>
<td>Appnt Wind Angle</td>
<td>Heel</td>
<td>VMG</td>
</tr>
<tr>
<td>6</td>
<td>4.411</td>
<td>44.7</td>
<td>9.36</td>
<td>25.4</td>
<td>4.3</td>
<td>3.135</td>
</tr>
<tr>
<td>8</td>
<td>5.174</td>
<td>44.3</td>
<td>11.85</td>
<td>26.5</td>
<td>10.0</td>
<td>3.706</td>
</tr>
<tr>
<td>10</td>
<td>5.531</td>
<td>42.7</td>
<td>14.03</td>
<td>27.2</td>
<td>13.7</td>
<td>4.063</td>
</tr>
<tr>
<td>12</td>
<td>5.712</td>
<td>41.4</td>
<td>16.07</td>
<td>27.8</td>
<td>16.0</td>
<td>4.284</td>
</tr>
<tr>
<td>14</td>
<td>5.821</td>
<td>40.5</td>
<td>18.03</td>
<td>28.4</td>
<td>17.5</td>
<td>4.423</td>
</tr>
<tr>
<td>16</td>
<td>5.887</td>
<td>40.1</td>
<td>19.94</td>
<td>29.1</td>
<td>18.7</td>
<td>4.505</td>
</tr>
<tr>
<td>20</td>
<td>5.936</td>
<td>40.2</td>
<td>23.66</td>
<td>30.9</td>
<td>20.5</td>
<td>4.535</td>
</tr>
</table>
<p></p>
<table>
<tr>
<td>
<div>
Downwind</div>
</td>
</tr>
<tr>
<td>True Wind Speed</td>
<td>Boat Speed</td>
<td>True Wind Angle</td>
<td>Appnt Wind Speed</td>
<td>Appnt Wind Angle</td>
<td>Heel</td>
<td>VMG</td>
</tr>
<tr>
<td>6</td>
<td>4.141</td>
<td>143.1</td>
<td>3.55</td>
<td>98.6</td>
<td>0.9</td>
<td>3.311</td>
</tr>
<tr>
<td>8</td>
<td>4.939</td>
<td>147.3</td>
<td>4.52</td>
<td>111.0</td>
<td>1.1</td>
<td>4.154</td>
</tr>
<tr>
<td>10</td>
<td>5.294</td>
<td>158.0</td>
<td>5.17</td>
<td>137.3</td>
<td>0.8</td>
<td>4.939</td>
</tr>
<tr>
<td>12</td>
<td>5.841</td>
<td>165.4</td>
<td>6.21</td>
<td>151.8</td>
<td>0.7</td>
<td>5.654</td>
</tr>
<tr>
<td>14</td>
<td>6.294</td>
<td>170.3</td>
<td>7.51</td>
<td>162.2</td>
<td>0.6</td>
<td>6.205</td>
</tr>
<tr>
<td>16</td>
<td>6.689</td>
<td>172.9</td>
<td>8.99</td>
<td>167.6</td>
<td>0.7</td>
<td>6.638</td>
</tr>
<tr>
<td>20</td>
<td>7.385</td>
<td>174.1</td>
<td>12.16</td>
<td>170.5</td>
<td>0.9</td>
<td>7.346</td>
</tr>
</table>


(man that was a lot of typing!)

It appears these polars recommend narrower angles at lower speeds than Loren's

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