X-Yard Pro: Boat Building

Planing Hulls - These are hulls with a shape that allows the boat to rise higher and higher out of the water as the speed increases. They are sometmes flat-bottomed, sometimes V-bottomed and sometimes round-bilged. The most common form is to have at least one chine to allow for stability when cornering and for a supportive surface on which to ride while planing. Planing hulls allow higher speeds to be achieved, and are not limited by the waterline length the way displacement hulls are. They do require more energy to achieve these speeds

Conventional planing hulls reach a steady planing condition after they have passed an extended range of speed, in which the craft is operated with a significant stern trim. This is caused by the increased bow wave, as well as by the accelerated flow at the stern due to the working propeller. The usually V-shaped bottom of a conventional planing craft works like a “flat plate”, not only creating lift, but also, due to its inclination (stern trim), a lot of additional resistance is induced. Therefore the main engines of conventional crafts are selected, not only in accordance to the power consumption of the craft at maximum speed, but also to the required engine power in the speed range of semi-planing.




	Building Materials

	A wide variety of materials are used in boat building: Plywood - A wood product in which thin sheets of wood are glued together, grains of adjacent sheets being at right angles to each other in the principal plane. Because of this cross-grained orientation, mechanical properties are less directional than those of natural lumber and more dimensionally stable. Plywood may be laminated into a round hull or used in single sheets. A type of the plywood panel boat building method is known as the stitch-and-glue method, where pre-shaped panels of plywood are edge glued and reinforced with fibreglass without the use of a frame. Marine Plywood - Is a specially treated plywood that is designed to resist rotting in a high moisture environment. Marine plywood is frequently used in the construction of docks and boats. BCX Plywood - "BC" is plugged or has the knots still in on the downward side. "X" is for exterior glued. Fiberglass - is material made from extremely fine fibers of glass. It is used as a reinforcing agent for many polymer products; the resulting composite material, properly known as fiber-reinforced polymer (FRP), are used in boat building because of it's molding ability and strength, resin and fiberglass cloth are combine to provide much additional strength to the plywood panels.




	Hull Type

	Planing Hulls - These are hulls with a shape that allows the boat to rise higher and higher out of the water as the speed increases. They are sometmes flat-bottomed, sometimes V-bottomed and sometimes round-bilged. The most common form is to have at least one chine to allow for stability when cornering and for a supportive surface on which to ride while planing. Planing hulls allow higher speeds to be achieved, and are not limited by the waterline length the way displacement hulls are. They do require more energy to achieve these speeds Conventional planing hulls reach a steady planing condition after they have passed an extended range of speed, in which the craft is operated with a significant stern trim. This is caused by the increased bow wave, as well as by the accelerated flow at the stern due to the working propeller. The usually V-shaped bottom of a conventional planing craft works like a “flat plate”, not only creating lift, but also, due to its inclination (stern trim), a lot of additional resistance is induced. Therefore the main engines of conventional crafts are selected, not only in accordance to the power consumption of the craft at maximum speed, but also to the required engine power in the speed range of semi-planing.