One major difference between the Extravehicular Mobility Unit and the Orlan space suits is the entry method. EMU uses waist entry while Orlan uses rear entry. The waist entry allows EMU to use a waist bearing between the Hard Upper Torso and the soft Lower Torso Assembly. On the other hand, Orlan has a rear entry hatch that extends around the hip of the astronauts.

Jordan (2006, p. 55) reports that EMU has more joint bearings and lower operating pressure than Orlan-M; as a consequence EMU is more mobile than Orlan-M.

While the rear-entry i-Suit has a waist bearing (Graziosi et al. 2006), its hatch is located much higher than Orlan's.

Therefore, does the design of Orlan's entry hatch preclude the use of waist bearings?

  • 2
    $\begingroup$ Not all readers will know all space jargon (I certainly don't!) This ORLAN could be from space as well! I hope you don't mind that I've added some links. $\endgroup$
    – uhoh
    Aug 8, 2018 at 22:34
  • 1
    $\begingroup$ yes it does.... $\endgroup$
    – user20636
    Aug 10, 2018 at 15:47


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