Originally Posted by Jabor
Anyway, why do boats have narrow beams and long hulls?
All other things being equal a long, narrow hull is able to move through the water easier than a hull of the same length but with a wider beam. This will result in greater fuel efficiency as it takes less power to push through the water and usually a greater speed than that beamy vessel of the same length each given the same power plant. It is similar to the aerodynamics that go into making automobiles more fuel efficient. A slick deign in the in the wind tunnel will help with MPG in the real world.