Archived posting to the Leica Users Group, 2003/03/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On 3/3/03 Seth Rosner wrote: > >Having served for almost two years as a young watch officer on U.S.S. >Intrepid, I know first-hand what it takes to drive a large vessel through >the water at above 30 knots. Above 40 knots is quite phenomenal. >Incidentally, one knot (as most know, it is a measure of speed, not >distance) equals about 1.13 miles per hour; 40 knots translates into a bit >above 45 mph. For displacement hull vessels power goes up as speed CUBED so to double speed from, say 20 to 40 knots means raising power by a factor of 8. For vessels that run submerged it goes up as speed squared so the amount of power required for the same speed increase for a submerged submarine is only a factor of 4. I've taken photos of both surface ships and submarines with my Leica - just to keep this on topic. Oh - and I didn't feel guilty since the cost of the camera was vastly less than any of the vessels I photographed. Pound for pound the America's Cup yachts were the most expensive. The submarines are by far the hardest being essentially flat black. At sea, of course, they are almost impossible. :) Adam - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html