



Quote:
e.g. if I want minsink at low Reynolds (thermalling) and maxglide at high Reynolds (to get through sinking air between two thermals). Have you read Martin Simons series of articles on RC soaring here: http://www.rcsoaringdigest.com/pdfs/Simons_UTSS.pdf I suppose you have. Paul 





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Here's how I would handle that problem. You can let me know if I'm being dense. In either of those cases (thermalling or flying between thermals), the lift is going to be known, so you can compute the Cl based on the flight speed and wing planform. Then compute the Reynolds number and Mach number as well for that flight condition. Finally, optimize the airfoil for 'mindrag' at each of these operating points. The reason being that if Cl is specified, all three types of optimization amount to minimizing the drag, even though the objective function may be computed differently. Dan 




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I'll think about it and give it a try tomorrow. Regards, Paul 




Dan, I'll admit I was a bit confused by the choice of "mindrag" or "minsink" and "maxglide".
Since the analysis is being performed on a 2D aerofoil, and not a complete wing, I couldn't see how you could calculate min sink or max glide conditions ? And isn't the mindrag optimisation being performed for each operating point independently, with the penalty functions and weights being used to determine the overall optimal aerofoil ? 
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