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Presentation onHOVERCRAFTS
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Contents
Introduction History Design Working Parts Piloting a Hovercraft Conclusion
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Introduction
An amphibious military or civilian vehicle Travels on any kind of surface (flat) Supported by a cushion of pressurized air It is closely related to aircrafts then
automobiles or boats Also called Air Cushion Vehicle (ACV)
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History
1716 Emmanual Swedenborg recorded a design, but was short lived
1870 Sir John Thornycroft filled patents involving air lubricated hulls
Christopher Cockrell began experimenting He built a 2-ft prototype 1959 one person hovercraft was built
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One Person Hovercraft
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SRN 4 Hovercraft
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Design
Can be powered by one or more engines Small crafts have a single engine with the
drive split through a gearbox Usually one engine drives the fan
responsible for lifting the vehicle The other forces air from the back and
pushes the craft forward
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Working
Two main principles:– Lift– Propulsion
A skirt is required to quarantine airflow No contact with ground, hence friction is
eliminated The shape of the body affects stability All parts are essential for proper working
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Parts
Lifting fanLifting fan: Usually used is a centrifugal fan
When rotated air is sucked into the center hole
It is coupled via a gearbox and connected to the engine
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Parts (Contd.)
Thrust propellersThrust propellers: An aircraft type with variable type pitch blades
Diameter ranges from nine feet to nineteen feet
In bigger crafts, the propellers are rotated
In smaller ones, rudders are used
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Parts (Contd.)
SkirtSkirt: Flexible strip fitted below bottom edges of the plenum chamber
Most sensitive design, it protects the craft and helps to lift it even higher
EngineEngine: Earlier engines were piston type, now gas turbines are used
Consists of a compressor, to compress air
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Parts (Contd.)
Air boxAir box: Placed right above the fan Prevents air from escaping the fan PowerPower: 15 ft long and 7 ft wide weighs
about 2000 lbs, power taken would be 19 lbs/sq.ft
Requires 4 Hp/sq.ft = 176 Hp to lift the craft 1ft above the ground
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Piloting a Hovercraft
The friction with the ground is minimum People say best way to ride is by leaning
back and forth like a jet ski It is possible to do a 360 degree turn
without stopping even once
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Conclusion
In theory hovercrafts are simple machines But a plethora of problems exist to make a
functioning hovercraft The plans and designs must be flawless To build a hovercraft one must be well
aware of the demands of construction Only then can one design a hovercraft
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References
Wikipedia – The free encyclopedia www.quicktechhobby.com Google search
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