ben
Thanks for pointing that out. I did not look at his series 2 because he said it had stability issues.
It caused me to compare what he arrived at with the 07 series I used. I have the Javafoil comparison here:
The Javafoil result for his P30210 is not far removed from his Xfoil result. His shape is not far off what I started with and thought would be a good shape primarily aimed at limiting the Cp for good high speed performance. I have spent a few hours fiddling with the pressure distribution to generate a better section than the 07 series and could not better it. The main difference between the ts P-series and the 07 is the larger diameter on the nose/tail of the 07.
You will see there is some instability with the 07 but not as bad as the ts P section. I am not sure how this instability would translate into feel when the required lift is low. It does highlight the merit of rigidly linking the rudders with a reversing linkage so any instability in the moment is balanced out directly through the linkage. On the wind 07 section rudders should have progressive feel similar to the NACA00##.
Rick
On 06/08/2010, at 1:26 AM, bjarthur123 wrote:
> I scanned through them and none are asymmetrical.
this one looks asymmetrical to me:
http://www.basiliscus.com/ProaSecti ons/AppendixC/ p30215.jpg
am i missing something?
ben
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