Buy Flights Tickets, and tell Captain not to fly faster than sound, I want to listen the Movie September 3, 2008
Posted by dodo in : Air Tickets, Airlines, Destination, Flight Schedule, Round The World , trackbackThis beautifully streamlined, state-of-the-art aircraft was actually first produced over thirty years ago. The 100-seater Concorde was, and still remains, the world’s only supersonic passenger aircraft. It is capable of flying at Mach 2.2, more than twice the speed of sound and at altitudes of up to 18 kilometres. At this speed and height the Concorde seems to hang motionless in the sky, the only sensation of movement being the shifting, curved horizon. Its dream-like performance is the closest thing to space travel the travelling public can experience.
Its stylish yet totally functional design remains unmatched among commercial aircraft. The wings are delta-shaped and swept back to form a triangle. Its characteristic needle-point nose is designed to droop for takeoff and landing for better pilot visibility but is raised into a streamlined position for the rest of the flight. Almost since its inaugural flight Concorde has been affectionately known as “DroopSnoot”.
“Droop-Snoot” is powered by four Rolls-Royce/SNECMA Olympus turbojets fitted at the rear of the wing. With full tanks, there are 119 500 litres of fuel on board. The wing span is 25,56 metres and the fuselage is 62,1 metres long. The maximum takeoff weight is 185 065 kg. At a height of 55 000 feet above sea level and a speed of 1320 mph (2 112 kph) each of the four engines delivers 10 000 lbs of thrust. Consider for a moment that the aircraft is then travelling at 220 miles (352 km) every ten minutes. Concorde has made everything else seem rather pedestrian.
Sadly, the Concorde is very expensive to build and operate and there are no known supersonic passenger aircraft on the drawing boards at present. So until further advances are made in space flight, the average passenger will have to be satisfied with a snail pace of around 80% of the speed of sound.
Mach Number and the Speed f Sound
An Austrian physicist, Ernst Mach, observed that the flow of air obeys different laws as it approaches the speed of sound. In recognition of his work, the term Mach number was named after him. The Mach number of a moving body is the ratio of its speed to that of the speed of sound.
When an aircraft is travelling at the speed of sound, it is said to have a Mach number of one — Mach 1. The speed of sound is faster in hot air and slower in cold air. Using the international standard atmosphere of 15° Celsius (59° F) which is an average at sea level, the speed of sound is about 760 mph (1 216 kph or 660 knots). At an altitude o between 50 000 and 60 000 feet above sea level, where the temperature averages minus 57° C (-71° F) the speed of sound is about 660 mph (1 056 kph or 573 knots).
To understand the sound barrier and how it works, imagine that you are on a small boat moving through water. The ripples that form the “V” shape in front of the moving boat look similar to the sound waves as they form and move ahead of the Concorde as it accelerates. As the speed of the aircraft approaches the speed of sound, the “ripples” creep ever closer to the nose.
At breaking point (Mach 1), the ripples receive no “warning” of the advancing aircraft and the pressure waves build up in front of its many leading edges and also behind the aircraft. At the point of penetration these pressure waves cause the “sonic boom” that is heard on the ground. These pressure waves create some problems for aircraft not designed or intended for supersonic flight. In the early days of breaking through the sound barrier, the aeroplanes would start shaking or buffeting near the speed of sound and sometimes tended to nose over, almost as if in a stall.
An enormous amount of engine thrust is required to achieve flight faster than the speed of sound. The Concorde is designed specifically for supersonic flight and unless the Captain alerts the passengers at the exact moment of penetration most passengers would be unaware that they had gone through the sound barrier.
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