Lou,

Excellent information. I like your examples also.
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<hr> looked up the xfoil site and find it interesting. However the design of an actual wing involves a lot of tradeoffs and compromises in addition to airfoil section.<hr></blockquote>
Mark Drela himself has several papers on that site that deal specifically with the tradeoffs of design. A single point airflow (xfoil) is really only an indicator. A wind tunnel may be somewhat better but we seldom find air flowing in such a laminar pattern when we fly. Another situation arises when we build. How close can the average builder come to the actual airfoil plots, consistantly, over the span of the wing.

But...understanding theory that comes from this data allows us to utilize the TLAR method successfully. Your TLAR involves a lot of backgraound and experience. I contend that in order to be successful in TLAR one should really understand the basics otherwise it becomes a hit or miss experiment.

I applaud Rockazella for asking the question and you for supplying an accurate and concise response.

konstantkrash