繁体中文  
 
版主:黑木崖
 · 九阳全新免清洗型豆浆机 全美最低
 
推进剂爆炸,美国暂停用F15发射卫星/反卫星项目
送交者:  2015年12月01日02:19:28 于 [世界军事论坛] 发送悄悄话

ALASA Launches on Hold Due to Exploding Fuel

2 Comments
Boeing's ALASA launch system features a F-15E aircraft and an innovative booster. (Credit: Boeing)

Boeing’s ALASA launch system features a F-15E aircraft and an innovative booster. (Credit: Boeing)

DARPA’s ALASA program has hit a small snag. It seems that Boeing’s secret sauce for the smallsat launcher is a bit too explosive:

The U.S. Defense Advanced Research Projects Agency has scrapped plans to launch small satellites from a modified F-15 fighter jet after two tests of a new rocket fuel ended in explosions this year.

Instead DARPA will spend the next year studying how to harness the volatile nitrous oxide-acetylene propellant and, in parallel, modifications to existing small rockets that would enable the agency place small satellites on orbit on 24 hours notice at a cost of less than $1 million.

In March 2014, Boeing Defense Space and Security of Huntington Beach, California, won a contract potentially worth $104 million to build and demonstrate the Airborne Launch Assist Space Access (ALASA) system. The program was intended to demonstrate the capability to launch up to 45 kilograms of payload into low Earth orbit on short notice for as little as $1 million.

“The magic” in Boeing’s design, as DARPA officials described it, was the powerful nitrous oxide-acetylene propellant, also known as NA-7. The propellant would be “pre-mixed” to reduce the plumbing needed on the rocket, enabling it to carry more payload.

Boeing led two subsystem tests in Promontory, Utah – one in August and one in April – aimed at learning how the pre-mixed propellant reacted to different temperatures, pressures and atmospheric conditions. In both tests, the propellant exploded.

- See more at: http://www.parabolicarc.com/#sthash.II62CO3E.dpuf
0%(0)
0%(0)
标 题 (必选项):
内 容 (选填项):
实用资讯
北美最大最全的折扣机票网站
美国名厂保健品一级代理,花旗参,维他命,鱼油,卵磷脂,30天退货保证.买百免邮.
一周点击热帖 更多>>
一周回复热帖
历史上的今天:回复热帖
2014: 英媒:拒绝英议员入境香港将带来纠纷与
2014: 日刊:美应攻击一绝佳目标 中国将崩溃只
2013: 土耳其-27℃!!! 中国特种兵泅渡过河
2013: 如果海外的华人不买日本汽车,其震惊效
2012: 事关崛起战略 海外学者呼吁中国应果断停
2012: 全民沮丧!罗老号火箭失败证明韩国好高
2011: 印度外资大规模跑路中
2011: 真正的J16出来了
2010: 美军又一艘航母进西太
2010: 从这份地图上看,朝鲜可以用火炮摧毁汉