--- On Fri, 26 Dec 1997 13:11:25 -0800 RJ@RMATSC.RIEM.COM wrote: > I still don't get it. If a platform sits between a rocket body >and payload then why would the platform ever separate from the >r/b? Am I not getting something? It would seem only a small percentage of the payloads put into orbit need a "platform". The platform, as I understand it, provides a service to the payload until final orbital parameters are reached. The platform can provide orientation, temporary electrical power needs, propulsion supplies, etc. that the "payload" doesn't need once final orbit is attained. The rocket body places the payload/platform into some preliminary orbit and detaches to reduce the total mass for any final maneuvers and propellant expenditures. Once the final orbit is attained, then again, the platform is detached to reduce the final mass and allow full extension of solar arrays, sensors, etc. Jeff Hunt <jeff@satellite.eu.org>