Introduction A hovercraft aircushion vehicle ACV is a vehicle that travels over land or water on a cushion of pressurized air This works on the principle of surface effect ID: 595410
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Slide1
HOVERCRAFTSlide2
Introduction
A
hovercraft
(
air-cushion vehicle
,
ACV
)
is a vehicle that travels over land or water on a cushion of pressurized
air
. This works on the principle of
"
surface effect
“. Although
supported by air, a hovercraft is not considered
an aircraft
.Slide3
PrincipleSlide4
The basic principle
The
basic principle of an air cushion is that if you lift an object off the ground using air you reduce the force needed to move the object.
Because
the object is no longer in contact with the ground the friction this causes (surface friction) is reduced, making it easier to move the object.
This also implies that the smoother the surface the less the friction. This is also true. Uneven surfaces with rocks and other obstacles can significantly slow down or even stop and damage an air cushion vehicle if the chamber containing the air cushion (the plenum chamber) was made of rigid materials. Slide5
Applications
Hovercraft are used throughout the world as specialized transports. They can also be used after a natural disaster for emergency purposes. Because they are supported by a cushion of air, hovercraft are unique among all other forms of ground transportation in their ability to travel equally well over land, ice, and water. Small hovercraft are used for sport, or passenger service, while giant hovercraft have civilian and military applicationsSlide6
History
The
first mention in the historical record of the principles behind hovering and hoverboats was by Swedish scientist Emanuel Swedenborg in 1716
.
In 1915 Austrian Dagobert Müller built the world's first air-cushion vehicle.
The first design that would be recognized as a true hovercraft was designed by Finnish aero engineer Toivo J. Kaario in 1931. Kaario's design included the modern features of a lift engine blowing air into a flexible envelop for liftSlide7Slide8Slide9
Modern HovercraftsSlide10Slide11Slide12Slide13Slide14Slide15Slide16
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