re hst servicing mission scheduled for days in article rs hlinn he gap caltech edu palmer cco caltech edu david m palmer writes you may want to put hubble back in the payload bay for a reboost and you don t want to clip off the panels each time the artist renderings that i ve seen of the hst reboost still have the arrays fully extended with a cradle holding hst at a degree angle to the shuttle i think the rendering was conceived before the array replacemnet was approved so i m not sure if the current reboost will occur with the arrays deployed or not however it doesn t appear that an array retraction was necessary for reboost for the gamma ray observatory one of the design requirements was that there be no stored energy mecahnisms springs explosive squibs gas shocks etc used for deployment this was partially so that everything could be reeled back in to put it back in the payload bay and partially for safety considerations i ve heard that the wings on a cruise missile would cut you in half if you were standing in their swath when they opened thanks for the input on gro s s a design constraints that would explain the similar design on uars back when the shuttle would be going up every other day with a cost to orbit of per pound everybody designed things for easy servicing heck the mms project used to design missions with servicing in mind the xte spacecraft was originally designed as an on orbit replacement for the instrument module on euve that way you get two instruments for the price of one spacecraft bus the explorer platform a second on orbit replacement was also considered with the fuse telescope david m palmer palmer alumni caltech edu palmer tgrs gsfc nasa gov david w gsfc
