Special Features regarding
the design of the boat-hull
and it’s performance on the water
The configuration of this design of a boat-hull consists of a single sharp nose (bow) centre pontoon which fades away into a tunnel about one third to halfway of the boat length, and with 2 pontoons like in a normal 2 pontoon catamaran configuration, to start or emerge in the hull about one quarter from the front of the boat -hull to continue up to the rear end.
This results in the boat -hull being a single hull at the bow section and then changing into a tri-maran configuration for a small portion of the boat approximately one quarter to about halfway from the nose in front, with two channels or tunnels then between the 2 side pontoons and the centre pontoon.
These two channels or tunnels allows for water flow as the water is displaced by the sharp nose centre pontoon.
They unite or converge into the single tunnel between the then only 2 pontoons typical catamaran configuration, and this assists to air rate the water flowing through thus enhancing lift.
The back portion of the boat-hull, as mentioned, about from halfway of the hull length, consists of a typical 2 pontoon catamaran configuration with a tunnel in between. As, with normal catamarans, this results in more stability and counteracts the typical excessive rolling motion of mono-hull boats on lively waters.
“The sharp point single nose in the front portion of the hull, the bow as in conventional mono-hull boats, cuts into surf or swells, displacing water and spray to both sides left and right, minimizing water and spray on deck.
When going through surf, of appropriate size, the sharp single centre pontoon nose or bow will cut through it; where as instead in comparison the normal 2 pontoon catamaran boats have a rather flat surface area at the front between the pontoons, which, in smaller boats, sometimes results in boats thrown over backwards.
This is due to the force of the surf with the ample area to catch on to or to exert force upon. Alternatively then greater speed is needed with normal 2 pontoon catamarans when hitting (big) surf with resultant heavier impact, more strain on the boat-hull construction and even (more) danger to the crew due to this hard impact. This is greatly reduced with the boat -hull design under discussion.
The nose, as mentioned in pt. 3, as a centre pontoon in the front of the boat, lends buoyancy and lift to the boat-hull; where as instead in comparison the normal 2 pontoon catamarans tend to dip into the water (when in motion or even sometimes stationary) due to the cutting action or capability of the sharper front portions of such pontoons. With such a dipping motion, our boat -hull design will counteract it due to the lift and buoyancy as mentioned. This results in a softer ride in comparison to normal catamarans.
The two concave halves at the bottom of or the underside of all the pontoons, allow for progressive lift and lesser contact or drag due to diminished wet area of the hull when moving with increased or increasing speed. This results in better fuel consumption of the driving motors, also when the boat is planning.
When planing, the boat effectively runs on the 2 side pontoons, and only occasionally “bumps” the centre pontoon of the nose section or bow on the water. These 2 side pontoons are only three quarters or up to about two thirds the length of the total boat -hull, thus resulting in a smaller contact wet-area of the hull (with medium and faster speeds) and reducing drag and friction through the water. This also improves fuel consumption when compared to normal 2 pontoon catamarans with their longer or full length pontoons for the same boat length. In the latter instance, as mentioned, normal 2 pontoon catamaran boat hulls tend to dip with their sharp cutting front portions, resulting in greater wet -area on the hull with more drag and friction. This dipping action, also results in normal catamarans to collect water (especially when trawling slowly in rough waters) over the nose portion with then more water and spray on deck. This is almost if not totally cancelled out by our boat -hull design under discussion.
Due to the single centre pontoon sharp nose portion, the tri-maran portion and the back portion with only 2 pontoons, the design of this type of boat-hull greatly reduces or absolutely minimizes any porpoising, rolling or broaching of the boat in following seas or going over or (partly) through swells and surf.
With this boat-hull design, the best qualities of both mono hull and catamarans came together eliminating the negative aspects usually encountered in both.