Tuesday, June 7, 2011
Monday, June 6, 2011
Tuesday, May 24, 2011
Ears pop because the airline cabin is artificially pressurised to a level that is different from the atmospheric pressure we’re accustomed to on the ground. Cabin air is maintained at about 75 per cent of normal atmospheric pressure — the equivalent of living in a high-altitude city.
In a typical pressurization system, the cabin, flight compartment, and baggage compartments are incorporated into a sealed unit capable of containing air under a pressure higher than outside atmospheric pressure. On aircraft powered by turbine engines, bleed air from the engine compressor section is used to pressurize the cabin. Superchargers may be used on older model turbine-powered aircraft to pump air into the sealed fuselage. Piston-powered aircraft may use air supplied from each engine turbocharger through a sonic venturi (flow limiter). Air is released from the fuselage by a device called an outflow valve. By regulating the air exit, the outflow valve allows for a constant inflow of air to the pressurized area.
The result of this is that air trapped in our bodies at standard atmospheric pressure, starts to expand. Thus the feeling of discomfort. Swallowing, yawning or holding your nose and gently blowing — normally equalises the pressure and eases any discomfort.
In a typical pressurization system, the cabin, flight compartment, and baggage compartments are incorporated into a sealed unit capable of containing air under a pressure higher than outside atmospheric pressure. On aircraft powered by turbine engines, bleed air from the engine compressor section is used to pressurize the cabin. Superchargers may be used on older model turbine-powered aircraft to pump air into the sealed fuselage. Piston-powered aircraft may use air supplied from each engine turbocharger through a sonic venturi (flow limiter). Air is released from the fuselage by a device called an outflow valve. By regulating the air exit, the outflow valve allows for a constant inflow of air to the pressurized area.
The result of this is that air trapped in our bodies at standard atmospheric pressure, starts to expand. Thus the feeling of discomfort. Swallowing, yawning or holding your nose and gently blowing — normally equalises the pressure and eases any discomfort.
What is the Aluminium Overcast? If one were to Google it, one would find the
name. But before you do that, try to guess. It could be a cool name for a
lot of things, but it's the nickname for a B-17 bomber. Here's a good site
to check it out! http://www.b17.org/
name. But before you do that, try to guess. It could be a cool name for a
lot of things, but it's the nickname for a B-17 bomber. Here's a good site
to check it out! http://www.b17.org/
Subscribe to:
Posts (Atom)