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In the world of crafts Air cushion vehicles (ACV) are fast catching up. Air cushion vehicle is a craft that travels on a layer of compressed air just above any kind of surface- land, water, ice etc. Their main area of applications are in military vehicles, helicopters and where transportation using wheeled or tracked vehicles are impossible. Air cushion vehicle (ACV) is a craft that travels on a layer of compressed air just above any kind of surface - land, water, ice, sand, mud etc. The compressed air serves as an invisible cushion that eliminates almost all friction between the vehicle and the surface. Air cushion vehicles are also known as Hovercraft. They can carry both passenger and freight. Some air cushion vehicles can travel as fast as 480 km per hour.In this seminars operations of ACV?s are reviewed.
Post: #2
plz sent me de details of dat i can present it in my college as my final year seminars.........plz do help me...........
Post: #3
A hovercraft or air-cushion vehicle (ACV) is a craft designed to travel over any smooth surface supported by a cushion of slow moving, high-pressure air, ejected downwards against the surface below, and contained within a "skirt." Hovercraft are used throughout the world as a method of specialized transport wherever there is the need to travel over multiple types of surfaces. Because they are supported by a cushion of air, hovercraft are unique among all forms of ground transportation in their ability to travel equally well over land, ice, and water. Small hovercraft are often used in physical activity, combustion, or passenger service, while giant hovercraft have been built for civilian and military applications to transport cars, tanks, and large equipment into difficult or hostile environments and terrain.

Today, often considered as the brainchild of Sir Christopher Cockerell, hovercraft are the result of a chain of developments from John Thornycroft's initial discovery in the late 1800s that air trapped beneath a ship's hull would reduce the friction imposed on the ship as it moved through water [1]. In the 1950s Sir Christopher Cockerell, a British engineer, discovered that by creating a wall of high pressure air forced beneath a hull, to create an air cushion, the hull (of the now Hovercraft) could be levitated furth

Post: #4
i want this full seminars
Post: #5

read this also
Post: #6
how much clearance between air cushion vehicle and surface which it move
Post: #7


 Air cushion vehicles are also known as Hovercrafts
 A hovercraft is a vehicle that floats slightly above surface either land or water it is over, on a cushion of air
 A hovercraft relies on air pressure to lift it off the ground, as opposed to aerodynamic lift
 A hovercraft can attain higher speeds than either ships or most land vehicles and use much less power than helicopters of the same weight.

The lift mechanism for a hovercraft must supply enough air to:
1. pressurize the air under the hovercraft enough to lift the vehicle off the surface
2. replace the air that leaks out from under the hovercraft so as to maintain the desired air pressure.
 Propulsion is that which makes the craft move
 The source of this effect is the fan, which is used to move the air for propulsion
 the propulsion of the craft requires a fan but a normal fan is not sufficient
 because a normal fan does not blow air straight
Lifting Fan

It is a centrifugal fan which operate efficiently in an environment when backpressure is high and they will move larger volumes of air for a given rotation speed than a propeller with the same speed and power input
It forces air into the chamber below the craft so creating a specific pressure under the craft.
Thrust Propellers
1. These are four-bladed and nineteen feet in diameter.
2. These are mounted on the pylon.
3. Pylons rotated to change the direction of thrust.
Hovercraft Skirt
1. The skirt is a shaped, flexible strip fitted below the bottom edges of the plenum chamber slot.
2. skirt enables a hovercraft to maintain its normal operating speed
3. The skirt material has to be light flexible
The Engine
1. The engine has a main shaft on which a compressor and a turbine is mounted.
2. A starter motor is connected to one end of the shaft and the other end is connected to the lift fan and propeller gearboxes.
3. When the engine is started, the compressor compresses air from the engine intakes and pushes it into combustion chambers. Fuel is squirted into the combustion chambers and ignited.
4. The compressed air then rapidly expands as it is heated and forces its way out through the turbine to the exhaust
Air box
1. The box-like structure at the rear of the hovercraft is called an air box.
2. The air box takes about 10% of the air being pushed backward by the propeller and forces it downward.
1. Operate over water, land, sandbanks, mudflats ice, rocks and rapids.
2. High Speed: Cruise at fill payload at speeds of 25 –36 knots.
3. A hovercraft over other vehicles is its ability to cross a wide variety of surfaces.
Post: #8
to get information about the topic Air Cushion Vehicles full report ,ppt and related topic refer the link bellow
Post: #9
Read the 700 page book 'On a Cushion of Air', (Amazon, The Book Depository, Kindle), which tells the story of Cockerell's discovery (heavy weights supported by low pressure air) and the development of the hovercraft from the early days to the heyday of the giant 165-ton SRN.4, which crossed the English Channel starting in 1968 carrying 30 cars and 254 passengers at speeds in excess of 75 knots. The service ended on 1st October 2000. Six SR.4s were built. See

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