On Sat, Feb 24, 2018 at 10:50 AM, shadow at shadowgard.com (via tml list) <xxxxxx@simplelists.com> wrote:

(big snip)

Usually set up so that the low end is stationary (only momentarily)
at some height above the ground.

(little snip)

Requires steady nerves or good automation to dock on either end. :-)

If the first is true, then I don't see why the second has to be true.

A [relatively] slow moving low end could be rigged to snatch up a cargo - https://en.wikipedia.org/wiki/Fulton_surface-to-air_recovery_system - either from a standing start (if it can stand the sudden jerk) or from a moving platform such as a bullet train.

Richard Aiken

"Never insult anyone by accident." Robert A. Heinlein

"I studied the Koran a great deal. I came away from that study with the conviction there have been few religions in the world as deadly to men as Muhammed." Alexis de Tocqueville

"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester (fictional monster hunter portrayed by Jensen Ackles)

"It has been my experience that a gun doesn't care who pulls its trigger." Newton Knight (as portrayed by Matthew McConaughey), to a scoffing Confederate tax collector facing the weapons held by Knight's young children and wife.