Why does the ISS not have a stanford tourus-like module, where they would be able to have (partial) gravity? Were there ever any plans to add such a module in the past?

Question

Why does the ISS not have a stanford tourus-like module, where they would be able to have (partial) gravity? Were there ever any plans to add such a module in the past?

In: 2

Answer 1

1 – zero g is kinda the point, otherwise just do the experiments on Earth.

2 – you need a fairly large radius to make the constant 9.81m/s acceleration comfortable. Smaller modules would have to rotate very quickly and have notably higher effective force at the feet than at the head.

3 – you’ll need to constantly expend fuel to not counter-rotate the rest of the ISS.