the Harrier Jump Jet
The Harrier Jump Jet is
the worlds only vertical take off and landing jet fighter. It was
developed by the British in an era of financial cutbacks which saw the
end of the large Royal Navy Aircraft Carriers. It can use airfields on
land or fly from smaller aircraft carriers at sea and is flown by the
best US and British pilots. It combines the best aspects of a
helicopter with those of a fighter jet. For example, the world speed
record for a helicopter is 249 mph (Linx helicopter) whilst the
Harrier can fly at 730 mph.
The Harriers most famous feature is
its vertical take off and landing capability. Although the Harrier has
one jet engine (The Pegasus) it has four nozzles that direct the jet
engine thrust downwards for vertical lift. (Diagram 1)
Once airborne the nozzles are slowly
revolved so that the plane moves forward. (Diagram 2)
Vertical take off and landing uses
an enormous amount of skill on the part of the pilot and also a large
amount of fuel. The Harrier can only hover for 90 seconds, in this
time it uses 150 gallons of water to keep the engine cool.
To save fuel a simple ramp allows
the plane to take off on a very short runway. This is used by the
Royal Navy Carriers. The planes appear to hop into the air.
Vents at the ends of
each wing can be used to direct some of the thrust and this allows the
pilot to move the plane left, right, forwards and backwards - whilst
hovering
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