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Cake day: June 18th, 2023

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  • With the exception of the recent Starliner fiasco, there are never more people on board the station than there are seats on the visiting spacecraft. In the event of a catastrophe, the Soyuz and Dragons function as lifeboats. To leave the station, you need to be able to close the station hatch from the spacecraft side. If you didn’t, the entire station would depressurize in your face when you undocked, which could cause a navigational hazard for the escaping ship.

    Therefore, it must be possible to crank the station hatch shut from the visiting vehicle side, and, it stands to reason, the reverse is true.

    This is a photo of the space-facing side of Shuttle / Dragon docking port on the station. The middle is a target to assist pilots in manually flying into the port straight and level. It was needed for the shuttle, newer spacecraft have automatic guidance. At 12 o’clock is a handle to help pull the hatch shut. (To open, you push the hatch in.) At 6 o’clock I believe is a socket you can put a crank into to seal or unseal the hatch. At 10:30 is a pressure equalization valve.












  • Still eight engines, though, huh? I guess they couldn’t just the additional work needed to move to four. It’d be more fuel efficient to move to four big engines instead of eight smaller ones, but it’d require strengthening the wing and doing something to increase the steering forces. If you loose an engine when you only have four engines, you loose twice as much thrust as you would have in an eight engine layout, so the remaining three need to work harder, and you have more unbalanced thrust then you would have with 7/8, especially if you loose one of the outboard engines.