日本的宇宙开发事业团和宇宙航空科学研究所,就利用现有的固体火箭技术研制一种小型运载火箭取得共识,他们一致认为这不仅很容易实现,而且将是非常有益的。基于这一认识,宇宙开发事业团在宇宙航空科学研究所的协助下,开始了J—1小型运载火箭的研制。 J—1火箭的基本方案是将H—2火箭的固体助推器与M—3S2火箭的第二级和第三级及有效载荷舱组合起来,构成一枚最大直径1.8m、全长33.1m、不含有效载荷的起飞重量88.5t的火箭。第一级的推力向量控制采用摆动喷管,第二级采用 Japan’s Space Development Agency and the Institute of Aeronautics and Astronautics agreed to develop a small launch vehicle using existing solid rocket technology and agreed that this would not only be easy but also very beneficial. Based on this understanding, NASDA started the development of J-1 small launch vehicle with the assistance of the Institute of Aeronautics and Astronautics. The basic plan of the J-1 rocket is to combine the solid propellant of the H-2 rocket with the second and third stages of the M-3S2 rocket and the payload bay to form a maximum diameter of 1.8 m and a total length of 33.1 m , Excluding the effective payload 88.5t rocket weight. The first level of thrust vector control using swing nozzle, the second level