Re: ISS slow rotation

J. Lee Blanton (
Tue, 5 Jan 1999 11:07:56 -0700

P.A. (Tony) Crossley wrote:

>If the rotation axis is the body's major axis, I'd term that truly a
>roll (intrinsically stable in itself for a cylindrical body), rather
>than a tumble (which I think would be intrinsically unstable).

An end-over-end tumble is stable; a roll is not.  A rolling cylinder will
tend to precess until the motion turns into a tumble.

I think Zarya has some large solar panels which might change its stability
characteristics from those of a pure cylinder.


J. Lee Blanton                          email:     
Temecula, California                    Tel/Voicemail/FAX:   (909) 699-6903
33.519N 117.102W 413m