hovercraft.pptx stimulation pof a hovercraft
- 1. Hovercraft
- 4. 1952 Sir Christopher Cockerel.I (British Engineering) He invented the hovercraft and patented in 1955. With diligent work he was able to bring his idea to reality with the first commercial hovercraft in 1959. British hovercraft corporation developed the first commercial hovercraft for passenger. From there on the idea took with numerous developments with the vehicle.
- 5. Elements of a Typical Hovercraft propeller;- It pushes the hovercraft ahead by pushing air behind. Fan:- Primary purpose is to inflate the cushion containing within the skirt beneath the craft as weUas to provide thrust with which to propel the craft Forward.
- 6. ELEMENTS OF ATYPICAL HOVERCRAFT Hull This is where the driver operates the hovercraft and passengers or cargo are located. It is the main body of the hovercraft which acts as the base forattachingof the other parts.
- 7. ELEMENTS OFATYPICALHOVERCRAFT Lifting System This consist of a centrifugal fan attached to a motor or an engine, which provides air for the cavity underneath the craft (called the plenum chamber) and also for filling the skirts.
- 8. ELEMENTS OF ATYPICAL HOVERCRAFT Thrust System This consists of propeller that moves air from in front of the craft and accelerates it out the back. This accelerated mass of air then generates thrust which pushes the craft forwards.
- 9. ELEMENTS OF ATYPICAL HOVERCRAFT Skirt This is the flexible wall that is attached all around the bottotn of the cTaft. The skirts prevents the pressmized air from escaping from the plenum chamber.
- 10. ELEMENTS OF ATYPICAL HOVERCRAFT Engine A typical hovercraft uses one engine but larger sizes can use more sometimes up to six engines. They usually utilized the typical maTine engines since they are quieter and fuel efficient.
- 11. ELEMENTS OF ATYPICAL HOVERCRAFT Control System This consists of a set of rudders that steer the craft by directing the air from the thrust system toward either left or right which consequently steers the craft.
- 12. WORKING OF THE HOVERCRAFT ., r- :.-The lift fan pushes a large volume of air under 1he hovercraft which is prevented from escaping by 1heskirt. :.-As the fan continues to force air into this cushion, the pressure under the hovercraft increases. ►When the pressure under t h e hovercraft exceeds t h e weight of t h e hovercraft. the hovercraft begins to rise off the ground this can be around 6" t o 105'' depending on the size of the craft. ►Eventually t h e hovercraft raises high enough to lift the skirt off theground. Air begins lo escape through t he gap between t h e ground and the skirt (called the hovergap). At some point the hovercraft reaches equilibrium point at which the amount of air being forced itoo thecushion cannot exceed the amount of air escaping throughthehovergap. At this point the hovercraftis hovering at its maximum hover height. ►Fans mounted on top creates this air which is used to propel the hovercraft forward and moving through the air, the rudder control direction of the hovercraft..
- 13. OPERATION OF THE HOVERCRAFT Brakes & Steering Steering Steering is accomplished by use of the rudders. The rudders are placed at the back of the craft in the direction of the thrust air flow. As the direction of the rudders are changed so is the direction of the craft. Brakes Hovercraft have no braking system. Simply reduce power until the craft no longer hovers. Thrust reversers can be used.
- 14. OPERATION OF THE HOVERCRAFT Fuel Consumption This will depend on the speed and other conditions which the craft is driven under. But it uses less fuel as compared to cars and boats under the same condition.
- 15. Advantages • Travel over any surface. • Shortcutting routes. • Travel in dry water beds. • No collision with debris, logs etc. • Access to 75°/o of coastal area instead of only 5% with conventional vessels. • Hovercraft are very fuel efficient 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 petrol boat with similar payload capacity • •
- 16. Disadvantages • They move a lot of air and can be relatively loud(Noise Pollution). • Steep grade can be issue. • Potential of skirt damage. • Not exactly agile(e.g.: cornering). • The hovercraft is bulky and its high speed make it difficult to control while on land. •
- 20. Thank You!