What's stopping a docking port passageway from being larger than around 0.8 meters? I heard that it was because docking ports were less rigid than berthing ports (so larger diameters would be harder to keep airtight), but I need more reasons why we can't have a passage that's 1 or even 1.3 meters in diameter.
Can the NDS act as the space side of an air lock?It may need a door.
Quote from: A_M_Swallow on 07/16/2014 06:11 pmCan the NDS act as the space side of an air lock?It may need a door.What's the inner diameter? AIUI, astros prefer a big door with little chance of entangling.
Do CBMs aboard the ISS use some sort of sub-aperture square-with-rounded-corners internal gateway (not pressure-tight) so that people passing through don't snag the utility lines? If so, what are its dimensions?
Quote from: Burninate on 07/18/2014 05:41 amDo CBMs aboard the ISS use some sort of sub-aperture square-with-rounded-corners internal gateway (not pressure-tight) so that people passing through don't snag the utility lines? If so, what are its dimensions?There are no utility lines that pass through the CBM hatchway. Utilities are connected on the peripheral of the hatch and pass through the pressure vessel. There is a vestibule that is accessible from the interior where jumpers are installed.
Quote from: baldusi on 07/17/2014 05:46 pmQuote from: A_M_Swallow on 07/16/2014 06:11 pmCan the NDS act as the space side of an air lock?It may need a door.What's the inner diameter? AIUI, astros prefer a big door with little chance of entangling.NDS - The NASA Docking System has a passage for crew and cargo with a diameter of 685 millimetres (27.0 in), which can be increased to 813 millimetres (32.0 in) by removing the petals of the capture mechanism after mating. IMHO An outer door will probably have the petals present.https://en.wikipedia.org/wiki/NASA_Docking_System
That's outdated info. The passthrough diameter is now 800 mm (31.5 in), the petals are no longer removable.
Seems to me there is little likelyhood that astros would want to go through a 31 inch diameter opening suited up... way too much snagability... I could be wrong but...
Quote from: Lar on 07/20/2014 01:52 pmSeems to me there is little likelyhood that astros would want to go through a 31 inch diameter opening suited up... way too much snagability... I could be wrong but...Then the astronauts will have to play a game of hunt the bigger hatch on Orion, Dragonrider, CST-100, DreamChaser and BA-330.
Quote from: A_M_Swallow on 07/18/2014 04:56 amQuote from: baldusi on 07/17/2014 05:46 pmQuote from: A_M_Swallow on 07/16/2014 06:11 pmCan the NDS act as the space side of an air lock?It may need a door.What's the inner diameter? AIUI, astros prefer a big door with little chance of entangling.NDS - The NASA Docking System has a passage for crew and cargo with a diameter of 685 millimetres (27.0 in), which can be increased to 813 millimetres (32.0 in) by removing the petals of the capture mechanism after mating. IMHO An outer door will probably have the petals present.https://en.wikipedia.org/wiki/NASA_Docking_SystemThat's outdated info. The passthrough diameter is now 800 mm (31.5 in), the petals are no longer removable.
Quote from: Pipcard on 07/22/2013 09:37 pmWhat's stopping a docking port passageway from being larger than around 0.8 meters? I heard that it was because docking ports were less rigid than berthing ports (so larger diameters would be harder to keep airtight), but I need more reasons why we can't have a passage that's 1 or even 1.3 meters in diameter.The Russian hybrid docking system has a passage that is 1100 mm in diameter.