You can while away quite a few hours playing on John Holtrop's interactive database. You'll find the Challenger listed as 'Alden 38'. I can't run it for you since my machine doesn't like the embedded macros in the spreadsheet. http://www.johnsboatstuff.com/Articles/fuzzy.htm
Anyway, your LWL is supposed to be 27.14, ant the usual rule of thumb is the square root of the LWL times 1.4. Gives 7.29344911, or so.
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