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ULA Betting On Big Birds in Rocket Reuse Equation

机译：ULA押注火箭重用方程式中的大鸟

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For United Launch Alliance (ULA), deciding how much reusability to build into its new line of Vulcan rockets came down to a question of math: Is it better to get 100% of the rocket value back some of the time, or two-thirds of the value all of the time?The answer, says ULA CEO Tory Bruno, depends on how big satellites will be in the future. Heavier spacecraft generally require more performance from their launchers to reach their intended orbits, possibly to the point of draining fuel reserved for the booster's propulsive flight back to Earth."We think there are going to be plenty of big ones," says Bruno. "Our math worked out where it was better to get two-thirds of the [rocket's] value back all of the time."The two-thirds value Bruno refers to is the cost of the Vulcan's first-stage engines, which will be either a pair of Blue Origin BE4s or two Aerojet Rocketdyne ARls.Unlike SpaceX's Falcon rockets or Blue Origin's upcoming New Glenn, which fly back for a vertical touchdown on a landing pad, ULA plans to separate the Vulcan's engine compartment from the first stage for a parachute glide and midair helicopter recovery. The rocket's fuel tanks and other equipment would be discarded."NASA archives have studies on propulsive flyback dating back 30 years, and the conclusion everyone made is that it would be very difficult and challenging technically because of the environments experienced on the return trip," says Bruno.
机译：对于美国联合发射联盟（ULA），决定在其新的Vulcan火箭生产线中构建多少可重复使用性归结为数学问题：在某些时候收回100％的火箭价值更好，还是三分之二？ ULA首席执行官托里·布鲁诺（Tory Bruno）表示，答案取决于未来将有多大卫星。较重的航天器通常需要发射器具有更高的性能才能达到其预定的轨道，甚至可能会耗尽为推进器强制返回地球而留出的燃料。布鲁诺说：“我们认为将会有很多大型航天器。” “我们的数学计算得出，最好始终获取三分之二的火箭价值。” Bruno所指的三分之二价值是沃尔坎第一级发动机的成本，这将是一对Blue Origin BE4或两个Aerojet Rocketdyne ARls，不同于SpaceX的Falcon火箭或Blue Origin即将推出的New Glenn，它们会飞回降落在着陆垫上进行垂直降落，而ULA计划将Vulcan的发动机舱与第一级分开以降落伞滑翔和空中直升机的恢复。火箭的油箱和其他设备将被丢弃。“美国航空航天局档案馆对30年前的反激式推进技术进行了研究，每个人得出的结论是，由于回程中遇到的环境，这在技术上将非常困难且具有挑战性，”布鲁诺说。

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