美国已经研制和使用过大力神、宇宙神、雷神、侦察兵等系列运载火箭。下面简要介绍一下它们的成功率和库存量。大力神系列至今共发射136枚,仅6枚发射失败,成功率达94％。其中大力神34D至今已发射9次,去年8月28日和今年4月18日发射各失败1次,成功率为78％。1985年8月28日大力神34D发射失败是跟芯级中一台航空喷气公司发动机涡轮泵 The United States has developed and used series of launch vehicles such as Hercules God, Cosmic God, Raytheon and Scout. Here’s a brief overview of their success rates and stock levels. Hercules series so far launched a total of 136, only six failed launch, the success rate of 94%. Hercules 34D has been launched nine times so far. On August 28 last year and April 18 this year, the launch failed each time with a success rate of 78%. August 28, 1985 Hercules 34D launch failed with the core level in an Air Jet engine turbo pump