低调做事的英国人正在加紧研制自己的空天飞机——“云霄塔”。虽然面世的时间被几度推迟,但他们的决心和干劲没有受到丝毫影响。今年7月17日物理学家组织网报道,英国航天局正在开发一种独特的火箭引擎“佩刀”(SABRE,亦译为“佩剑”)。其在低层大气飞行时可根据需要从空气中抽取氧气作为氧化剂,15分钟内能将飞行器送入平流层飞行,有效载荷可达15吨,而成本仅约为传统运载火箭的2%。飞行器既可在高层大气中飞行,又 Low-key work of the British are stepping up their own space flight - “Skylight ”. Although the available time has been postponed several times, but their determination and motivation has not been the slightest impact. July 17 this year, the Physicists Network reported that the British Space Agency is developing a unique rocket engine “Saber” (also translated as “Saber”). When in the lower atmosphere, oxygen can be extracted from the air as an oxidant when needed in the lower atmosphere. It can fly the aircraft into the stratosphere within 15 minutes with a payload of up to 15 tons at a cost of only about 2% of that of a traditional launch vehicle. The aircraft can fly in the upper atmosphere, again