On Wed, 5 Jul 2006, Joe Strout wrote:

Suppose you have a large space station (OK, let's say a colony) with a
rotating portion and a stationary portion, both pressurized, and with
constant traffic back and forth between them. Obviously you need a
large mechanical seal between them, and I have some questions about that
which I hope someone can answer:

Lets say the stationary protion is in the center of a wheel. Instead of
this dubious mechincal arrangement, it would be easier for cargo arriving
at the center to match angular rotation prior to landing.