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For all i know, there is no such thing as a flat-bottomed clark-y profile. a flat-bottomed clark-y is the result of a lazy model aircraft builder. the original profile is undercambered (as it should be, for aerodynamic efficiency)
- Have a look at [1] for example. The Clark-Y is flat on the bottom within a 2 decimal place degree of accuracy. At model scales this represents such a minute dimension that nobody could feasibly build it that accurately. The popularity of the Clark-Y is partly due to this flatness - it can be built on a flat board. Aerodynamically the difference in performance between the "true" curve and a flat approximation is negligible, and swamped by other factors. Graham 05:11, 26 April 2006 (UTC)
