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  • I like your mixture of metric and imperial units ;-) Commented Nov 7, 2012 at 12:59
  • @BenediktBauer -- Necessary, since Watts are metric and pounds/feet are imperial. Besides, it's easier to find the formulae expressed in metric. Commented Nov 7, 2012 at 14:04
  • @BenediktBauer -- Oops!! -- Just realized what you were trying to say. Commented Nov 7, 2012 at 16:58