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Old 02-14-2013 | 08:49 AM
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Default RE: The Why of Clark-Y

Reynold's Numbers are the conversion factor for air molecules. You can't scale the air. We talk about it in reverse; the air tunnel guys build small and dream big; we get stuck making big to small. That is where it gets tough. 1/4, 1/3, 1,2 scale planes get large enough where the numbers start becoming more reasonable. Think of it like one of those guru people who sleep on the nail beds. When their body is large they get to distribute their weight over more points. GI Joe size and he has been pungy stuck. The nails dont change size only the person.
Clark Y and its competition USA35B( Cub) were the first step away from the WW1 style undercamber which have a very narrow control range; the stall is ugly and the top speed is limited on how much down trim you can add. The Y could do every thing better. A Cub is about the same size as a N11; which one performs better? The next advancement would be the M-6 which is faster still and does better upside down stuff with a good stall, and then you go symmetrical. When we replicate a scale plane we replicate the problems too; taking the out of scale is just turning it into Twilight Zone physics wise. Dont think the WW1 guys would not have wanted a Pitts Special; they would have been unstoppable against any of the WW1 planes.