I've studied the new airfoil pages and Mark Langford’s great turfing pictures. Unless I missed it, I couldn't locate and information on the extent of laminar flow on top and bottom of the airfoil. I'm sure wind tunnel time is precious, so extra testing beyond the primary stuff is hard to justify:
I'm primarily interested in the transition points along the chord at high speed straight and level. Based on similar airfoils data, I'd guess around 60% chord should be about the limit for true laminar flow on top, and similar on bottom at 200mph. Marks tufting photos showed impressively clean flow on the yarns placed around 85% chord, clearly showing less that chaotic flow action. I’d assume the transition points and percentage of laminar flow was calculated during the design process. Does anyone know if that info is available? George
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