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A wave-piercing boat
A wave-piercing boat hull
Hull may refer to:
Structures
* The hull of an armored fighting vehicle, housing the chassis
* Fuselage, of an aircraft
* Hull (botany), the outer covering of seeds
* Hull (watercraft), the body or frame of a sea-going craft
* Submarine hull
Ma ...
has a very fine bow, with reduced buoyancy
Buoyancy (), or upthrust, is the force exerted by a fluid opposing the weight of a partially or fully immersed object (which may be also be a parcel of fluid). In a column of fluid, pressure increases with depth as a result of the weight of t ...
in the forward portions. When a wave is encountered, the lack of buoyancy means the hull pierces through the water rather than riding over the top, resulting in a smoother ride than traditional designs, and in diminished mechanical stress
In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such as a stretched elastic band, is subject to ''tensile'' stress and may undergo elongatio ...
on the vessel. It also reduces a boat's wave-making resistance
Wave-making resistance or wave resistance is a form of Drag (physics), drag that affects any object moving on a surface of a fluid, such as boats and ships moving on the surface of water, and reflects the energy required to push the water out of ...
.
Design theory
Design theory is a subfield of design research concerned with various theoretical approaches towards understanding and delineating design principles, design knowledge, and design practice.
History
Design theory has been approached and inte ...
calls for very long thin hulls, so in practice most are multi-hulls such as catamaran
A catamaran () (informally, a "cat") is a watercraft with two parallel hull (watercraft), hulls of equal size. The wide distance between a catamaran's hulls imparts stability through resistance to rolling and overturning; no ballast is requi ...
s and trimaran
A trimaran (or double-outrigger) is a multihull boat that comprises a main hull and two smaller outrigger hulls (or "floats") which are attached to the main hull with lateral beams. Most modern trimarans are sailing yachts designed for recrea ...
s.
The main current usage areas are passenger ferries
A ferry is a boat or ship that transports passengers, and occasionally vehicles and cargo, across a body of water. A small passenger ferry with multiple stops, like those in Venice, Italy, is sometimes referred to as a water taxi or water bus.
...
and naval ship
A naval ship (or naval vessel) is a military ship (or sometimes boat, depending on classification) that is used by a navy. Naval ships are differentiated from civilian ships by construction and purpose. Generally, naval ships are damage resili ...
s.
See also
* * * , later renamed MY ''Ady Gil'' * * * , a pioneer of the design * * Norwegian Cruise Line -Class Cruise Ships * hull form * * * : an racing multihull * : high-speed trimaran warship * *References
Naval architecture Water waves {{shipbuilding-stub