Rotating Space Stations Wiki

A structured knowledge base distilled from the NASASpaceflight.com forum thread "Realistic, near-term, rotating Space Station" (topic 34036; 5161 posts, 16 Feb 2014 to 20 Sep 2026).

Pages summarize the thread's results: numbers, design rules, trade-offs and unresolved questions. They do not retell the discussion. Every claim links to the forum post it came from, and each page ends with Open questions and Sources (forum posts with author, date, reply number and likes; plus external references).

Headline results

  • Comfort: ~2 rpm is conservative (SpinCalc); most people adapt to ~4–6 rpm, and up to 10 rpm stepwise. There are no long-duration human data below 1 g, and the first-priority unknown is the partial-g dose–response (human factors).
  • Stability: spin only about the maximum-inertia axis, with margin. Barbells need in-plane mass (3 arms, or arrays at 90°); long cylinders tumble (stability).
  • Sun-pointing costs 2π·L of angular momentum per year. It is trivial for small stations and prohibitive for kilometre-scale ones, which should fly edge-on or at L ≈ 0 (orientation).
  • Radiation drives mass. Equatorial LEO at 400–600 km needs little shielding; deep space needs ~1–10 t/m². Active shielding needs too much power at station scale (radiation).
  • Geometry: shielding and pressure scale with area, so compact barbells and spheres beat tori at small scale, and tori are easier to mass-produce (comparison).
  • Docking to a spinning station is unsolved in practice. The options are: the vehicle matches spin, counter-rotating gantries, short-term rotating ports, or a zero-g companion station with shuttles (docking).
  • Food: ship bulk food and grow 5–10% fresh produce; a greenhouse pays off only for occupancies of decades (agriculture).
  • Business case: the engineering is known and the motivation is missing. Candidate customers are tourism, crew health for zero-g workers, and partial-g research (business models).

Contents

01. Foundations

02. Human factors

03. Rotation physics

04. Architectures

05. Structures and materials

06. Hub, docking and transfer

07. Station systems

08. Construction and logistics

09. Economics, marketing and VR

10. Concepts catalog

Forum Concepts

Historical

Industry Concepts

11. Reference

How to read citations

Inline citations show as "author, date" and each one points to the exact forum post. Some post IDs in the working notes were corrected against the forum database; a few citations point to related threads (marked "external post").

Source

Forum thread: https://forum.nasaspaceflight.com/index.php?topic=34036.0 . Extracted from a local SQLite archive (forum.db).