When the choice comes down to those two boats. Please take them as contructive critizism.



Lower drag of the hulls ?



Unlikely. In fact a good case can be made that the wave making drag has been significantly inceased. Reason; by diving up a full length hullin two shorter hulls you have lost displacement. Ergo you need to make the little hulls fatter to get back at the required displacement again. The fattening of the hulls will make the prismatic ratio of the liitle hulls to be considerably greater than that of a full length hull which can be made narrower. Your wave system which is greatly influences drag at higher speeds may well be significantly greater that that of a conventional.



Furthermore; by adding two more bows and stern section your ratio of volume to wetted surface area may also be greater than that of a conventional hull. Wetted surface is very important in determining drag at lower speeds.



The fact that your hulls more closely resemble a "more efficient" NACA shape is something alot of people will take to but NACA never optimized these sections to function best on a transition plane from water to air = the watersurface. The researchers develloped the optimal shapes for an object completely and sufficiently surrounded by a substance in one state = 100 % gas (NACA aerofoil section ?) or een 100 % liquid (at lower speeds where compression of air is not a factor).



In short the NACA were never developped with a wave system in mind and this system is cause to a large portion of the overall drag of a sailing craft.



Not needing a Keel ?



Any sailboat needs a item the limits sideways moved or else the sails can not propel the boat forward on other course than downwind. Now a rounded hull gives some resistance to sideways motion but not alot; hence the requirement of either a daggerboard or a keel/skeg. These parts are adsolutely required for sailing, it is the core of the sailing design. Yes other methodes are possible but I don't see any the proposed design.



Crossing beam on a 3 mtr. platform.



With the righting moment you can develop you are looking at something like 1000 kg's of maststep pressure. Your design features two beams of about 5 mtr. length. When each beam takes 500 kg load in bending your dolphin strikerless beam will look like 0,15 mtr. diameter beam with 2 mm wallthichness at the minimum. And these beams will deflect about 50 to 70 mm in the middle (2 to three inches). Your proposed joints like to weak and the whole platform will be very flexible instead of stiff. The weight of 2 such beam will combined will be 22 to 23 kg's. Compare this to 7,5 kg's for two beams on a conventional 16 footer. That leave only 50 kg's for all the rest the mat will be 10 kg's at least and the sail will be some 4 to 5 kilograms at least. that means that you are left with 35 kg's for four hulls and the remainder of the beams on the side. Personally I don't think you can build 4 hulls and three meore beams (totalling 11 mtr. for 35 kg'.



But than ofcourse I'm only a human and I would love to see a novel design like yours work it is what brings new technology into cats sailing. Very important. Just make sure you wear a helmet when you sail it the first time, okay ?



Wouter



(Naval and Mechanical engineer)