Hovercraft 5

8/3/2019 Hovercraft 5

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SEMINAR ONHOVERCRAFT


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IntroductionIntroduction

A Hovercraft is a vehicle that

Flies like a plane but

Float like a boat

Drive like a car

It can hover over or move across land or water surfaces while

being held off from the surfaces by a cushion of air.


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A Hovercraft can travel over all types of

surfaces including grass, mud, muskeg, sand,

quicksand, water and ice .Hovercraft prefer

gentle terrain although they are capable of

climbing slopes up to 20%, depending upon

surface characteristics.


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HistoryHistory The first design by Swedish designer Emmanuel

Swedenborg in 1716.

The project was short-lived because it was neverbuilt, for soon Swedenborg soon realized that tooperate such a machine required a source ofenergy far greater than that could be suppliedby single human equipment.

Until the early 20th century Hovercraft was not

practically possible, because only the internalcombustion engine had the very high power toweight ratio suitable for Hover flight.


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SOME PICS OF HOVERCRAFT


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THE FIRSTHOVERCRAFT

Christopher Cockerel thought of using aload of stuff you might find about thehouse to make a hovercraft.

Cockerel took a set of scales and a longrod and arranged them so the rod was

vertical. He then affixed a vacuum cleaner to the

rod so it pointed down. Next he made a hole in a can and affixed

a can that was smaller than the first insuch a way it allowed air in-between the

two cans.C

ockerel made the vacuumcleaner blow instead of suck, blowing airthrough the gap in the two cans, and itworked.

The scale went down as far as it could!.


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BASIC STRUCTURE OF HOVERCRAFT

Parts Of Hovercrafto Propeller :- It pushes the

hovercraft ahead by pushingair behind.

o Fan :- Primary purpose is toinflate the cushion containedwithin the skirt beneath thecraft as well as to providethrust with which to propelthe craft forward.

o

Skirt :-Part that allows thehovercraft to clear

obstacles. Generallyspeaking, the higher theskirt, the larger the obstaclethat the craft will clear.


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PRINCIPLE OF WORKING

To lift the craft by a cushion of air to propel itusing propellers.

The air sucked in through a port by large lifting

fans which are fitted to the primary structure

of the craft.

They are powered by gas turbine or dieselengine.


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Fan is used to inflate the skirt and rest is

ducted down under the craft to fill area

enclosed by the skirt.

At the point when the pressure equals the

weight of the craft, the craft lifts up and air is

escaped around the edges of the skirt.

So a constant feed of air is needed to lift the

craft and compensate for the losses.


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Hovercraft are very fuel efficient (CO friendly)

as Hovercraft do not have to plough through the

water but "fly" above the surface. At maximumspeed fuel consumption of a Hovercraft is approx.

70% less than of a fast patrol boat with similar

payload capacity.

No turbulence or impact in water as no propeller

churns up the water so sea life remains untouched


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FUTURE OF HOVERCRAFTThe future of

hovercraft seemsuncertain, but there is agood chance there willbe huge hover ports allover the world, like the

one in the picture.Thinner hovercraftmight be built socivilians can drive safelyon roads. It also seemslikely that the larger

hover vehicles willbecome larger thanever! Hovercraft arelikely to be capable ofhigh flight.


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CONCLUSIONHovercrafts are generally simple mechanisms

in theory. Yet the process from theory tomanifestation is not as easy as it may seem. Aplethora of problems exist and must be faced in

order to attain a well functioning hovercraft.The plans and designs must be flawless. Onemust take under consideration the weight andthe shape of each component in order to avoidproblems such as instability and dysfunction. Onething is certain; when building a hovercraft, be

well aware of the demands of construction. Beprepared and willing to embrace failure for it isthe only way to success. Only after failedattempts will you be able to finally design aneffective hovercraft.


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THANKSTHANKS

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Hovercraft 5