A project of Space station Freedom had a long evolution and eventually ended as US segment of International Space Station.

For ISS we know specialisation of pressurized modules.

What were purposes of Freedom station's pressurized modules?

enter image description here

I found this NASA video:

But this video is not detailed enough to deduce the purposes of pressurized modules.

Interesting moments from the video:

1) Cupola-like observation cabin looks in zenith, not in nadir like on ISS.

2) Interiors of pressurized modules have many similarities with ISS. But there is much more messy in ISS modules, with lots of wires and equipment at walls.

3) Glovebox at Freedom station

4) There is nothing like Quest airlock. What EVA airlock was planned for Freedom station?

Because the desing of Freedom station was changed many times, an answer about at least one configuration would be good enough.


Edit: I found a much better picture from MSFC dated 1991. (Better than the ones I used earlier) It's basically your picture with labels.

enter image description here


  • $\begingroup$ unfortunately I can't open the link :( And the picture is unreadable. About the airlock - it's very likely, thanks. Are there any other sources available? $\endgroup$ – Heopps Jul 1 '18 at 7:26
  • 1
    $\begingroup$ New picture - yes, that is! Thanks! At least two interesting details: 1) docking modules look different from ISS. I suppose they are for shuttle without Shuttle Docking System add-on, to save payload. 2) propulion modules on truss, not on rear end of a pressurised module $\endgroup$ – Heopps Jul 16 '18 at 8:14

I found a picture with better resolution here:


page 207

enter image description here

It confirms that Organic Marble posted.

Japanese module is identical to actual Kibo module on ISS. Crew Return Vehicle (CRV) looks some odd, I wonder what is the structure on its top... But there were several alternative concepts of CRV. Logistics module is that pointed to nadir I suppose, as MPLMs at ISS.

Beyond the scope - I was also wondering about propulsion of Freedom station. From this article I can deduce that gaseous hydrogen/gaseous oxygen engine was considered. The components were planned to be obtained by electrolysis of water dumped from Space Shuttle fuel cells.


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