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Hovercraft-MIdhun Vijay

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Hovercraft-MIdhun Vijay

  1. 1. Contents  Preface  Introduction  History  Invention  Basic Structure  Principle Of Working
  2. 2.  Hovercraft Preview  Advantages  Disadvantages  Applications  Future
  3. 3. 1) Drive like a car but 2) Flies like a plane. 3) It can hover over or move across land or water surfaces while being held off from the surfaces by a cushion of air. 4) Float like a boat.
  4. 4. 4) 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.
  5. 5. #) A hovercraft, also known as an air-cushion vehicle or ACV, is a craft #) Hovercraft are hybrid capable of travelling over vessels operated by a pilot land, water, mud or ice as an aircraft rather than a and other surfaces both at captain as a marine vessel. speed and when stationary.
  6. 6. #) They operate by creating #) They typically hover at a cushion of high-pressure heights between 200mm air between the hull of the and 600mm above any vessel and the surface surface and operate above below. Typically this cushion 20 knots and can clear is contained within a gradients up to 20 degrees. flexible "skirt".
  7. 7. #) Very large versions have been used to #) They are now used transport hundreds of throughout the world people and vehicles #) The first practical as specialized across the English design for hovercraft transports in disaster Channel whilst others derived from a British relief, coastguard, have military invention in the 1950s military and survey applications used to to 1960s. applications as well as transport tanks, for sport or passenger soldiers and large service. equipment in hostile environments and terrain.
  8. 8. 1) The first design by Swedish designer Emmanuel Swedenborg in 1716.The project was short-lived because it was never built. 2) In 1915 Austrian Dagobert Müller built the world's first "water effect" vehicle. 3) In 1931 Finnish aero engineer Toivo J. Kaario began designing a developed version of a vessel using an air cushion and built a prototype. 4) During World War II an engineer in the United States of America, Charles Fletcher, invented a walled air cushion vehicle. Because the project was classified by the U.S. government, Fletcher could not file a patent.
  9. 9. INVENTION 1) The idea of the modern hovercraft is most often associated with Sir Christopher Cockerell. 2) Cockerell built several models of his hovercraft design in the early 1950s.
  10. 10. The First Hovercraft
  11. 11. Basic Structure Of Hovercraft Parts Of Hovercraft o Propeller :- It pushes the hovercraft ahead by pushing air behind. o Fan :- Primary purpose is to inflate the cushion contained within the skirt beneath the craft as well as to provide thrust with which to propel the craft forward. o Skirt :- Part that allows the hovercraft to clear obstacles. Generally speaking, the higher the skirt, the larger the obstacle that the craft will clear.
  12. 12. Detailed Construction Of Hovercraft Construction of hovercraft varies according to it’s Applications.
  13. 13.  Radar: apparatus that detects objects through the use of microwaves.  Pylon: supporting post.  Dynamic propeller: two-bladed apparatus that provides motion.  Fin: steering device.  Rudder: apparatus that prevents drift.  Lift-fan air intake: opening to allow air to enter.  Main level drive gear box: compartment that contains and protects the gear mechanism.  Skirt finger: part of the flexible skirt.  Passenger entrance: opening on the side wall that provides access to the passenger cabin.  Flexible skirt: lower flexible part.  Bow door ramp: opening at the front.  Control deck: cubicle from which a hovercraft is operated.
  14. 14. Principle Of Working #) To lift the craft by a cushion of air to propel it using 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 diesel engine.
  15. 15. #) 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.
  16. 16. 1) Travel over any surface. 2) Shortcutting routes. 3) Travel rivers up as fast as down, irrespective of the current. 4) Travel in dry water-beds 5) No collision with debris, logs etc. 6) Access to 75% of coastal area instead of only 5% with conventional vessels
  17. 17. #) Hovercraft are very fuel efficient (CO² friendly) as Hovercraft do not have to plough through the water but "fly" above the surface. At maximum speed 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.
  18. 18. 1) They move a lot of air and can be relatively loud. 2) Steep grades can be issue. 3) Potential of skirt damage/puncture. 4) Not exactly agile (eg: cornering).
  19. 19. Applications of Hovercraft • Border/coastal/inland patrol, anti terrorism, drug smuggling patrol. • High speed marine sub surface & ground scanning survey & detection. • Rescue work from flooded areas, mud, sand, tidal areas. Rescuers can reach floods, mud, sand & ice victims without exposing rescuers to life threatening danger. • Distribution of famine or flood aid support craft. Relief work (United Nations). • Civil emergency & infrastructure support • Oil industry survey, exploration & pipeline patrol. • Electrical Power-line patrol & safety. • Remote mining access support vehicle.
  20. 20. • River, lake & port geological surveys. • Mud & riverbed sampling. • Environmental projects & clean-up operations. • Coastal civil engineering & bridge construction & repair/maintenance. • Transport, service & safety craft for river & low tide coastal work where 24-hour access is vital for staff safety. • Fish farm & low tide access. • Leisure & family fun. Rental Operations, Corporate entertainment. Education, schools. Summer fetes & shows. • Access to Riverside, lakeside & island properties. Hovercraft travel over mud, sand & ice. Hovercraft are not restricted by tide, or fast running water. Or shallow water, or submerged rocks, coral, or marine life. • Filming & TV work. Store sales & advertising (Harrods).
  21. 21. The future of hovercraft seems uncertain, but there is a good chance there will be huge hover ports all over the world, like the one in the picture. Thinner hovercraft might be built so civilians can drive safely on roads..
  22. 22. • Hovercrafts have been a must have for coast guard veterans, disaster relief agencies, and personnel,. Publicly and commercially, rescue services to those in need. • personal fishing excursions, • accommodate previously hard to reach locations, providing transportation, goods and delivery services more effectively than before, while law enforcement, military, and government patrol and rescue outfits can find their mark quickly and effortlessly, no matter the terrain’s composition. • With unique ingenuity comes exceptional design, style and reliability. Hovercrafts are safe, exciting to use and drive, and are easier to own than ever!

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