David replied to me: > > With no hydrodynamics, the drag is 6,879 and the speed is > > 26.6 * 2 (planing) * 1.1 (streamlining) = 58.5 mph. > > With mediocre lines, the drag is 1376 and the speed is > > 45.5 * 2 (planing) * 1.1 (streamlining) = 100 mph. > > With average lines, the drag is 688 and the speed is > > 57.3 * 2 (planing) * 1.1 (streamlining) = 126 mph. > > With fine lines, the drag is 457 and the speed is > > 67.7 * 1.1 (streamlining) = 72.3 mph. > > With very fine lines, the drag is 344 and the speed is > > 72.2 * 1.1 (streamlining) = 79.4 mph. > > Any ship that goes much faster than its hull speed (which is about 1.3 > times the square root of the length in feet at water line, answer in > knots) is going to be planing, even it's not a hull that's well suited > for it. In a non-planing hull, it's a lot more expensive to go a bit > faster than in a planning hull, and it can be terrifyingly dangerous.
Fine or very fine lines are -2 to wMR, and average lines are -1. Not exactly terrifying danger, but a step in the right direction ... basically I can choose between -1 to aMR or 25 mph less. Either way, there will be roughly 10 times the payload of my ducted fan flyer moving at 1/5th the speed for the same sticker price, so there is room in an universe for both. An ekratoplan might have twice the payload of the ducted fan flyer at 2/3th the speed, but it might be slightly more expensive. Onno _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
