Aussie_Space_Nut: Starship-bay hab wheel (2019)

Design summary

Habs sized to fit the Starship bay; protected aluminium cans rated for 1 g; LEO Aussie_Space_Nut, 2019-03-29.
Gravity. 5 rpm gives 1 g on the outer floor and 0.67 g on the inner floor Aussie_Space_Nut, 2019-03-29.
Build. 11 launches. Stability was checked at each build stage: stable from launch 5 onward, with the docking port on the axis at launches 6, 7, 9 and 11 Aussie_Space_Nut, 2019-03-30.
Variants. Twin counter-rotating wheels (13 launches) raise a precession issue; a triple wheel Aussie_Space_Nut, 2019-03-30; Aussie_Space_Nut, 2019-03-30.
"Spin Gravity Mothership": a stable version with Starships docked and its own engines; spin up during a gentle Mars boost Aussie_Space_Nut, 2019-04-06; Aussie_Space_Nut, 2019-04-06.

Coastal Ron: don't spin until complete, and never stop. Counter-rotating wheels on a shared shaft precess, so put the counter-rotating part in the middle; only the dock should counter-rotate, with no air seal Coastal Ron, 2019-03-30; Coastal Ron, 2019-03-30; Coastal Ron, 2019-03-30.
A tube with airlocks between the wheels, and slip rings A_M_Swallow, 2019-03-30. Rim magnetic bearings (Babylon 4) rakaydos, 2019-03-30.

How do twin counter-rotating wheels handle precession torques on their shared structure?

Aussie_Space_Nut, 2019-03-29 (reply #1422, 4 likes): Starship-hab station (4 likes). Post. Attachments: 0001-BFR-Station Details.jpg, 0001-BFR-Station Launches.jpg.
Aussie_Space_Nut, 2019-03-30 (reply #1426): Stability by build stage. Post. Attachments: 0001-BFR-Station Launches Numbered.jpg.
Coastal Ron, 2019-03-30 (reply #1430): Don't spin until complete. Post.
Coastal Ron, 2019-03-30 (reply #1432, 1 like): Counter-rotation precesses. Post.
Aussie_Space_Nut, 2019-03-30 (reply #1433): Twin/triple wheels. Post. Attachments: 0001-BFR-Station Twin.jpg, 0001-BFR-Station-Twin.wmv.
Aussie_Space_Nut, 2019-03-30 (reply #1437, 1 like): Variants. Post. Attachments: 0001-BFR-Station-Tripple.wmv, 0001-BFR-Station Tripple2.jpg.
Coastal Ron, 2019-03-30 (reply #1439, 1 like): Only dock counter-rotates. Post.
A_M_Swallow, 2019-03-30 (reply #1440): Tube between wheels. Post.
rakaydos, 2019-03-30 (reply #1444, 1 like): Rim magnetic bearings. Post.
Aussie_Space_Nut, 2019-04-06 (reply #1480): Mothership. Post. Attachments: 0002-Spin-Gravity-Mothership.jpg.
Aussie_Space_Nut, 2019-04-06 (reply #1482): Spin up during boost. Post. Attachments: 0002-Spin-Gravity-Mothership-Stable.jpg.