读者朋友一定见过喷气式飞机,但可能没见过火箭式飞机。其实,喷气式飞机和火箭式飞机算得上是一对“双胞胎”。它们都是牛顿第三定律和动量守恒原理的具体应用。只不过一个只携带燃料,另一个要携带燃料和氧化剂;一个只能在空气中飞行,另一个可在太空中飞行;一个大获成功,另一个却半途夭折而已。在二战期间,日本军方曾秘密研制过“秋水”火箭式飞机,并一度试飞升空。 Readers must have seen jet aircraft, but may have not seen a rocket plane. In fact, jet and rocket aircraft can be regarded as a pair of “twin”. They are all Newton’s third law and the principle of conservation of momentum. Only one carries fuel, the other carries fuel and oxidants; one can only fly in air and one can fly in space; one succeeds and the other dies halfway. During World War II, the Japanese military had secretly developed “Autumn Water” rocket aircraft, and once took the test flight.