>> Kind of makes me wonder how many waterskiers could go >> behind, say, an Enterprise-class nuclear aircraft carrier That's easy. IF the "boat" can handle 1 skier at speed then 10% extra should be OK. Bad assumption set: - A skier consumes engine power at the same rate per mass as the ship does now. - Add 10% mass and you can still ski. - Average skier with gear is 120 kg - Ship masses 40,000 tons/tonnes Skiers = Ship_Mass a 10% / skier_mass = 40000 * 0.1 / .12 =~~~~~~ 33,000. Probably correct within factors of 2 to 0.1 :-) Adjust bad assumption set to your own assumption set. Another data point is that the Klondike express didn't have enough power to tow 120 skiers. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist