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Active In SP

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Joined: Mar 2010
19-03-2010, 11:29 PM

I am doing my final year seminor on hovercraft pls send the details about it
seminar flower
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Posts: 10,120
Joined: Apr 2012
17-07-2012, 04:18 PM


.ppt   Hovercraft G1 p6.ppt (Size: 679 KB / Downloads: 85)
How a Hovercraft works

A hover craft is a machine that rides on air under pressure that is continuously supplied by the lift system. A flexible curtain called a skirt is attached to the base. The hovercraft is propelled by a thrust propeller. The steering is applied by using a rudder on the back of the propeller.stopping is achieved with the reduction of power engines or turning 180 degrees and applying full thrust.

History of the Hovercraft

The formative years of today’s practical hovercraft began as an idea to reduce the drag placed on boats and ships as they plough through water at high speeds. The term “hovercraft” was actually a commercial name patented in 1955, then subsequently released to public domain. The hovercraft concept, however, can be traced back to the early 1700’s.The principle behind today’s hovercraft was originally demonstrated by Sir Christopher Cockerell in 1955, using a contraption constructed with a cat food can, a coffee can and a set of kitchen scales.During recent decades, this early demonstration has metamorphosed into a vehicle that now performs a multitude of vital services: saving lives in rescue operations; transporting military troops; ferrying passenger; and providing a vast array of recreational opportunities to people throughout the world.

General safety procedures

Always walk- do not run
Never talk to or interrupt anyone who is working on a machine
Remove power plug or turn off power supply to a machine when changing cutters or blades
Never leave tools or pieces of stock lying on the table surface of a machine being used
When finished with a machine, turn off the power and wait until the blade or cutter has come to a complete stop before leaving
Always carefully check stock for knots, splits, metal objects, and other defects before machining.
Do not use a machine until you understand it thoroughly. Any tool can cause serious injury if mishandled.

Table Saw Safety procedures

Table saw kickback can be caused by the workpiece getting pinched between the blade and the fence. It can also be due to the saw kerf closing up behind the blade. In each case, the workpiece can be hurled towards the operator at great speed. To avoid the danger, take the following precautions:
Make sure the fence is exactly parallel to the blade.
Never tilt the sawblade towards the fence
Feed stock straight through the blade; crooked cuts are dangerous
Never stand directly behind the blade. If stock is kicked back, this is the path it will take.
When the width of the board is six inches or more use ripping cuts
Crosscutting is used for short boards under six inches

Drill safety procedures

Disconnect the power plug before installing or removing drill bits
Make certain the drill bit is clamped securely in the chuck
Be sure the chuck key has been removed
Do not force the drill. Use an even steady pressure
Never use a bit with a square, tapered tang in an electric drill. The drill’s chuck will not hold this kind of bit securely
When laying the drill down, always have the point away from you, even when it is coasting to a stop
Never drill through cloth
Always clamp small pieces; do not hold them with your fingers when drilling.

seminar tips
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12-12-2012, 11:50 AM

to get information about the topic "hovercraft " full report ppt and related topic refer the link bellow





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