The resistance, or drag, is a physical term for a force wanting to counteract the motion of a moving object. In planing boats there are four main resistance components

  • Frictional (viscous) resistance from wetted surface area
  • Induced resistance, the cost of lifting the boat out of the water
  • Aerodynamic resistance, air resistance on the hull, deck, superstructure etc
  • Appendage resistance, form and frictional resistance on sterndrives, gearhouses, rudders, etc