When it comes to boats of smaller length out performing others of longer length WOUTER there is such a thing as "efficiency" that comes into the equation, it should be obvious that of two craft of differing size, a craft designed smaller BUT more efficient WILL out perform a craft that is moderately larger but incorporating a greater amount of inbuilt inefficiencies (all other variables being equal). You use a lot of formulations gleaned from various places, but you seem unable to combine them into an accurate, logical result for other than that which suits your purpose at the time, this is not a criticism, but purely a personal observation.
Have you not noticed that an ice yacht far outperforms sailing craft (on liquid water) of ANY size and power, by many times? All the principles of aerodynamics and hydrodynamics apply equally to both. The ice yacht is sailing on water in its solid form but it is still sailing IN water in its liquid state due to the pressure of the blades on the surface of the ice at point of contact. You could be a little less reserved when intimating that “smaller should in some way be slower”, Smaller IS slower when ALL other relative factors are equal, but only when they are equal, and that could perhaps explain why there exist the differences between a “Tiger” for example and an “A” class, their differences far outweigh their similarities. To even try to compare different class’s of cats “theoretically” is fraught with “pitfalls” due to the HUGE amount of different related variables between them. To take only a small “few” of these differences and try to say “this is why”, no matter how many established principles and “theories” you try to apply is invariably going to lead to incorrect or at best, subjective conclusions.
As to Marjac or Bethwaite, I have to confess that having been personally familiar with Bethwaite for over 40 years, and having applied Marjac’s “theories” with success to my own commercial designs, I have to say that when it comes to “originality” and accuracy of experimentation. I have to give Marjac top marks and Bethwaite rates somewhat considerably lower.
