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A hovercraft (air-cushion vehicle, ACV) is acraft capable of traveling over surfaces while

supported.By a cushion of slow moving, high-pressure air

which is ejected against the surface below andcontained within a "skirt." Although supported byair, a hovercraft is not considered an aircraft.

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1 . Propellers

2. Air3. Fan4. Flexible skirt

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The air beneath the hull would lubricatethe surface and reduce the water dragThe air sucked in through a port by

large lifting fansThey are powered by gas turbine or

diesel engine.The air is pushed to the under side of

the craftAir from the lift fan is used to inflate the

skirtWhen the pressure equals the weight ofthe craft, the craft lifts upAir escaped around the edges of the

skirt. So a constant feed of air is neededpropulsion is done by the propeller

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Stability of the Hovercraft on its cushion of airremained a realplenum chamber with a momentum curtain was

developed by Sir Christopher Cockrell.high -pressure air was blown into the annulararea between two concentric tin cans producedan annular ring of airflowThis pressure provides lift to craftSo only small amount of air flow needed to the

craft

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The e i e ha s a ai sha ft hich is te a c ress r and t r ine.

starter t r is c nn ected t ne end and the therend is c nn ected t the lift fan .

hen the eng ine is st arte d the c ress r c ressesair fr t he eng ine intakes and shes int thec sti n chamb ersF el is s irte d int the c mbu sti n chamb er and is

ign ited.ex and s as it is heated and f rces its ay ut thr ugh

the turbine t t he exhau sts the gas ress ure r aises t he turbine s ee ds up ,

The eng ine speed increases un til it re aches eng inesnorma l op erating speed

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U sed to travel people and equipmentU sed military as war shipsU

sed in sportsPreservationSpherical canister type vacuum cleaner

(domestic hover craft)

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Move over both water and land with someheight

move with heavy loads over difficult terrain

It need one quarter of power required by ahelicopter

It is very e citing to fly and feeling effortless

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http://www.quicktechhobby.com

http://www.hovertechnics.com

http://www.rescuehovercraft.com

www.wikipedia.org

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PRESENTED BYSHIJINDAS

MS5NO:41