TW2013, these boats don't plane. They are pure displacement hulls. However, since they have so little surface area at the waterline to make wave, it really doesn't take a lot to power them. Your typical limits on hull speed and length at the waterline simply don't apply to these designs. These boats will idle along at bikini spotting speed with very little power. The more power, the faster you go, just like any other displacement hull, but without the limitations of a huge bow wave to climb over. They work more like submarines, which will go a lot faster under water than at the surface due to not making wave.