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Reasons of efficiency.
not the least of which is that the pressure generated in the combustion chamber has to fight less "back pressure" (think of it as pressure resistance) at high altitude because the air-pressure is less.
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Why do planes fly high?
Planes fly high to get above the weather, and to avoid air traffic. For jet planes, certain altitudes, all quite high, afford more efficient flight conditions.
Why rocket fly in space instead of air?
I think I know what you're getting at... Rockets burn loads of fuel really quickly so we use jet engines in the atmosphere... The thing is that jet engines need oxygen to mix with fuel to burn it. Rocket engines contain their own oxygen which means that they are the most practical way for us to get into space.
What are the winds high in the atmosphere'?
The jet stream.
Why would it not be possible to use a jet engine on a spacecraft to take a man to the moon?
Have you SEEN the price of gasoline lately....Just kidding-- Rockets fuels are rated by Specific Impulse, a measure of how fast the explosion travels when it shoots out the back. Gasoline is good as a fuel, but not as good as many others. The space shuttle uses hydrogen and oxygen.
What can you infer about the height jet airplanes fly based on the fact that their contrails form cirrus clouds?
Cirrus clouds only form at high levels, so jet plaanes fly at super high levels.
Why jet engines are used at high altitudes?
For thrust. Engines are used to overcome the drag of the airplane.
Why do jet airplanes fly at high altitudes?
Jet airplanes fly at high altitudes because it is more fuel efficient. Flying at higher altitudes uses less fuel than flying at lower altitudes.
Why were jet engines better than propeller driven engines?
Jet powered aircraft have a number of advantages over conventional internal combustion propeller driven aircraft. To start with, jet engines can operate in a much wider range of conditions. Propellers lose their effectiveness at high altitudes and at high speeds while jet engines are capable of operating at much higher altitudes and a much much higher speeds with little or no loss of power. Jet engines have fewer moving parts than internal combustion engines which makes them easier and simpler to design, build, maintain and repair. Jet engines run on fuel that is very similar to diesel fuel, and is much safer to handle and store than gasoline. Jet engines can produce much more thrust power for their weight than conventional reciprocating engines do.
What are high-altitudes high velocity rivers of air are called?
Jet streams
What blows at very high speeds at altitudes above 12km?
jet stream
What is it called when giant rivers of air that develop at high altitudes?
Jet stream
What is injected into high pressure air in a jet plane?
Jet fuel is injected into high pressure air in jet engines.
What does a large temperature gradient at high altitudes of the atmosphere cause?
Polar jet streams
What does large temperature gradient at high altitudes of the atmosphere cause?
Polar jet streams
Where are the j58 engines?
On the standard version the Blackbird has its j58 engines on its wingtips and if you are referring to an older model the j58's are of lower quality but still located in the same place.on the other side of the jet engines there is the outer wing. that means that the j58's have extra stability while at high altitudes.
What type of wind blows at high speed at altitudes above 12 km?
Jet-streams
What is narrow belts of strong winds at high altitudes which flows from west to east?
jet streams
