麦道宇航公司和空军已决定,继续研制德尔它Ⅱ中型运载火箭第二种改型,这种改型将比原来计划的功率更大。它的特点是使用加长的固体火箭发动机,能把大于4000磅的有效载荷送上地球同步轨道。麦道宇航公司原计划制造德尔它Ⅱ的两种改型运载火箭。第一种是一种过渡性改型,将用来发射空军的全球定位系统卫星。6925型将有一个加长的第一级、一个较宽的整流罩,并且将使用一种功率 McDonnell Douglas and the Air Force have decided to continue developing the second variant of the Delta II medium-powered launch vehicle, which will have more power than originally planned. It features an extended solid rocket motor capable of delivering payloads greater than 4000 pounds to geosynchronous orbit. McDonnell Douglas planned to make two modified launch vehicles for the Del II. The first is a transitional variant that will be used to launch Air Force’s GPS satellites. The Model 6925 will have a longer first stage, a wider fairing, and will use one power