How can a motor boat run on surface tension???

Answer 1

Next best thing would be a ground-effect or air cushion aircraft... the Soviets built some very interesting prototypes years ago. The principle was to fly very close to the ocean and let the build-up of turbulence under the wings support a greater load more efficiently then flying higher up.
http://en.wikipedia.org/wiki/Ground_effect_in_aircraft
http://en.wikipedia.org/wiki/Ekranoplan
http://www.flightglobal.com/articles/2002/09/24/155296/ground-effect-aircraft-detailed.html

Answer 2

A motor boat doesn't it work on surface tension it floats on buoyancy or Archimedes' principle. That principle states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. The principle applies to both floating and submerged bodies and to all fluids, i.e., liquids and gases. So the boat experiences an upward force equal to the weight of water it displaces. The boat continues to displace water until equilibrium is reached and it floats. If that equilibrium point is not reached it sinks.