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36 votes
Accepted

Was the ship decompression scene in the movie Aliens realistic?

I did a quick extrapolation from Organic Marble's data (1.5" diameter hole = lose 1500 lbs of air per hour from 14.7 psi; flowrate proportional to the square root of the pressure differential) and my ...
Russell Borogove's user avatar
24 votes

Was the ship decompression scene in the movie Aliens realistic?

As much as I love this movie, it's not very realistic. Here are some cabin leak numbers for the shuttle Orbiter. At an initial 14.7 psi cabin atmosphere, a 1.5 inch diameter round hole was projected ...
Organic Marble's user avatar
19 votes
Accepted

How many kg of air escape from the Quest airlock during one EVA?

I haven't found a reference giving the number, but we can make a back of the envelope approximation. Page 49 of The International Space Station - Operating an Outpost in the New Frontier reminds us ...
Organic Marble's user avatar
10 votes
Accepted

Door to vacuum on the ISS

Sure (although you might have to open other hatches to get to them) The hatches in the PMAs connected to Node 2 if no visiting vehicle there, and the unused CBM hatch on Node 2. The unused CBM ...
Organic Marble's user avatar
8 votes

How would you eject an object from an airlock for maximum velocity?

You can't open an airlock hatch to vacuum until the pressure inside is essentially zero. The hatch opens inward and is held closed by tons of force if there is any appreciable delta pressure. ...
Organic Marble's user avatar
7 votes

Was the ship decompression scene in the movie Aliens realistic?

The outer door of the airlock should open inwards against the air pressure. But opening the door against the huge force of the pressure to the large area of the door is impossible. If the door is ...
Uwe's user avatar
  • 49k
7 votes

How Is The Quest Joint Airlock Operated?

The airlock opening procedure is on the Crewlock Depress/Repress Cue Card, found in the EVA checklist on the JSC FDF page. Here is a brief decoding of the steps. 1&2 - ensure the suit ...
Organic Marble's user avatar
5 votes

What is the fastest time for donning a space suit?

The “entry-exit” time in the Orlan-M spacesuit is 2 ... 3 minutes (without outside help). But this does not make practical sense if the spacesuit and the crew of the station are not prepared for work. ...
A. Rumlin's user avatar
  • 7,863
5 votes
Accepted

ISS: Airlocks between pressurized modules?

This applies to the US side of the ISS. They don't exactly have "airlocks" in the sense that an airlock = a compartment that can be decompressed and someone in the compartment can leave the vehicle. ...
Organic Marble's user avatar
4 votes
Accepted

What would happen if you jumped out of a moving spacecraft?

If your vehicle is in space (not in an atmosphere or supported by ground), the only forces acting on the vehicle (and you as an occupant) come from thrust applied by the vehicle's engine(s). If no ...
Anthony X's user avatar
  • 17.5k
4 votes
Accepted

Bishop airlock: explanation of the name?

I emailed Nanoracks with this question and I got an email back from the CEO Jeffrey Manber, who kindly gave me permission to quote him. Which is pretty impressive I must say. So though I am not really ...
Organic Marble's user avatar
4 votes

Energy needed to open/close entry points in a rocket

The only energy needed to open or close an airlock door is that needed to overcome the mechanical friction in the hinges / overcome the inertia of the hatch. This is because the differential pressure ...
Organic Marble's user avatar
4 votes

What is the fastest time for donning a space suit?

Astronauts universally don their spacesuits during prebreathing procedures, so they cannot accelerate the process by donning the suit faster. There is also no reason to don particularly quickly, ...
Schlusstein's user avatar
  • 2,157
3 votes
Accepted

Is the inner airlock hatch kept open in-between spacewalks on the ISS?

The configuration between EVAs is - Inner hatch open, Outer Hatch closed, Inner hatch equalization valves closed. Reference: ISS EVA Checklist Look at the POST EVA steps. The first few actions ...
Organic Marble's user avatar
2 votes

What happens if the inner door of a depressurised airlock fails?

When some of the crew are outside performing spacewalks, the outer door is open and the inner door is closed. A structural failure of the inner door at this point would result in an explosive ...
Organic Marble's user avatar
2 votes

What happens if the inner door of a depressurised airlock fails?

Both doors of the airlock should resist the full pressure difference between vacuum outside and spaceship air pressure inside. During normal use of the airlock both doors are exposed to both the full ...
Uwe's user avatar
  • 49k
2 votes

Is it possible to create an overridable inflatable airlock seal?

There's a fabulous overview of inflatable airlocks past, present, and future in this presentation DEVELOPMENT OF AN INFLATABLE AIRLOCK FOR DEEP SPACE EXPLORATION From Voskhod's Volga to all the ...
Organic Marble's user avatar
1 vote

What do the astronauts do whilst the air-lock cycles?

The current EVA procedure involves the astronauts camping out for several hours in the equipment lock while pressure the air transitions from the standard for the station to what they will be ...
Schlusstein's user avatar
  • 2,157

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