Archive for November, 2008

Defining the Dynamic Maximum

  A ride over rough water in a fast motorboat can be an unpleasant event.  The violent motion of a planing hull crashing over waves is likely more rough than any other mode of transportation a person will experience.  Often speed must be reduced to prevent slamming, prolonging the uncomfortable journey and consuming extra fuel, as planing hulls are less efficient at speeds below planing.  

   To address this problem, a vessel must be seaworthy and capable of high speed, be efficient at all speeds and must prosess a more comfortable motion in rough water.

In designing a vessel that satisfies these requirements, our approach has been to define what we call “the dynamic maximum”.  The dynamic maximum is a theoretical point of optimum balance of design criteria, where combined performance in all aspects is greatest.  It can only be arrived at through experimentation, in our case with models in a tank testing scenario.  The equilibrium is reached when a planing hull has a minimum of wetted surface area and wind resistance yet sufficient planing properties to exceed hull speed.

  Our “Dymax” hull represents a major innovation in pleasure craft.  It’s unique design gives it  extraordinary hydrodynamic properties.  The narrow entry parts the water with minimum resistance and the rounded midship sections displace smoothly and evenly. 

A pronounced step draws air under the clean aft sections, further reducing drag.  The result is an extremely smooth ride at all speeds.  Acceleration from displacement to planing mode is quick with none of the bow-high pitch experienced in ordinary planing hulls.  The boats cruise comfortably and efficiently at high speed with no tendancy to porpoise or oscillate. 

The easy, rounded sections act as shock absorbers, eliminating pounding.  At rest, the narrow hull is stabilized like a trimaran by the inflated tubes aft.

  The ride of a dymax hull is the dynamic maximum of comfortable performance, an elegant expression of the craft of yachting.


Read Full Post »