Talk:Cabin pressurization

From Wikipedia, the free encyclopedia

	This article is within the scope of the Aviation WikiProject. If you would like to participate, please visit the project page, where you can join the project and see lists of open tasks and task forces. To use this banner, please see the full instructions.	Aviation Portal
Start	This article has been rated as Start-Class on the quality scale.
Additional information and associated projects or task forces: This article has been checked against the following criteria for B-Class status: Referencing and citation: not checked Coverage and accuracy: not checked Structure: not checked Grammar: not checked Supporting materials: not checked To fill out this checklist, please add the following to the template call: <!-- B-Class-1. It is suitably referenced, and all major points have appropriate inline citations. --> |B-Class-1=yes/no <!-- B-Class-2. It reasonably covers the topic, and does not contain obvious omissions or inaccuracies. --> |B-Class-2=yes/no <!-- B-Class-3. It has a defined structure, including a lead section and one or more sections of content. --> |B-Class-3=yes/no <!-- B-Class-4. It is free from major grammatical errors. --> |B-Class-4=yes/no <!-- B-Class-5. It contains appropriate supporting materials, such as an infobox, images, or diagrams. --> |B-Class-5=yes/no This article is not currently associated with a task force. To tag it for one or more task forces, please add the task force codes from the template instructions to the template call.

Changes:

• "Whenever a rapid decompression is faster than the inherent capability of the lungs to decompress"

This just doesn't happen on commercial jets, although maybe it's a problem for astronauts. When the pressure drops, you will exhale no matter how hard you try to keep it in. Sentence deleted.

• "When temperatures drop because of a decompression, injuries such as frostbite and hypothermia will begin to appear. "

If the reduced pressure after a decompression for hypothermia to set in, you're already dead. Sentence deleted.

• "Cabin pressurization has additional benefits - for instance, the air-tight environment partially protects passengers from the tremendous noise of the engines and cold temperatures in high altitudes."

Not really true: Pressurized aircraft are definitely not airtight, noise protection comes from the walls, and pressure does not protect from cold. Sentence deleted.

—Preceding unsigned comment added by 200.170.108.84 (talk) 22:10, 6 February 2008 (UTC)

Contents 1 two deletions above 2 Mythbusters 3 First aircraft 4 Difference between cabin and cargo 5 Pressure and speed of escape at a pinhole

[edit] two deletions above

What is the problem that led to the deletion (described above) of hypothermia and frostbite? Those airliners do have drop-down oxygen masks. The pressure problem is hardly any more than Everest (29,000 feet), so as long as they are breathing O-2 they are likely victims for hypothermia and frstbite unless the airline falls to a lower altitude. On another point (also above), as any SCUBA diver knows, a decrease in ambient pressure does not force you to exhale -- if you hold your breath you can be a victime of alveolar rupture and air embolism. I think both of these delitions should be reversed. The other one is correct.

[edit] Mythbusters

Mythbusters tested this myth in their usual semi-scientific ways. Their findings are in no way proof.

"Semi-scientific" is too polite a term. "Mythbusters" uses methodologies and criteria for the public that are often outright contradictory to science (I can't watch it). Rapid decompression is a dependent on the size of the hole as well as the volume and pressure of the cabin - and the delta pressure (altitude). It can be calculated, but one can't make an absolute statement because pressure,cabin volumes, delta pressure (and window areas) are not uniform.

[edit] First aircraft

Some people think that the Lockheed XC-35 was the first, and not the Boeing 307; However the first did not enter production.

[1] Dagoflores --189.166.14.226 (talk) 08:20, 12 January 2008 (UTC)

[edit] Difference between cabin and cargo

Does anyone know what the difference between the pressure in the cabin relative to the cargo area is? How much pressure is your luggage subjected to (if the pressure in the cabin is 0.7 bar? When does spray bottles break?

Thanks —The preceding unsigned comment was added by 63.240.133.93 (talk) 02:07, 16 March 2007 (UTC).

My uncle (a retired airline pilot) said that the cargo area is pressurized exactly the same as the cabin since they often carry pets down there. In newer planes it is even heated and uses the same ventilation system as the regular cabin.-- Nick. 08:49, 21 September 2007 EST. —Preceding unsigned comment added by 65.112.23.131 (talk)

[edit] Pressure and speed of escape at a pinhole

"An otherwise-harmless pinhole under these pressure differences will generate a high-pitched squeal as the air leaks out at supersonic speeds[citation needed]." --This does not seem right, because even assuming a complete vaccum (due to aerodynamic effects, if any) just outside the skin of the aircraft, the pressure differential is less than 10 PSI, and a pinhole in a car tire (30 psi) does not generate such a loud noise. —Preceding unsigned comment added by 200.170.108.84 (talk) 21:42, 6 February 2008 (UTC)