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1983年2月和8月日本用主力火箭N-Ⅱ从种子岛发射了一组(两颗)同步通信卫星(樱花2号a和b)。N-Ⅱ火箭能发射350公斤重的同步卫星。H-Ⅰ火箭将成为日本1985～1990年的主力火箭,它能发射550公斤重的同步卫星。H-Ⅰ火箭可以说是日本开始独立研制(尽管其中有些部分仍是仿制)大型火箭的里程碑,因为以前的N-Ⅰ和N-Ⅱ火箭的国产率仅50～60%,包括H-Ⅰ在内的第Ⅰ级部是从美国引进的,但日本对H—Ⅰ进行了一些改进,即第Ⅱ
In February and August 1983, Japan launched a group of (two) synchronous communications satellites (Sakura 2 a and b) from Tanegashima with its main rocket N-II. N-II rockets can launch 350 kilograms of geostationary satellites. The H-1 rocket will become the main rocket of Japan from 1985 to 1990 and will launch a 550-kilogram geostationary satellite. The H-1 rocket can be said to be a milestone for Japan in starting to independently develop (though some of it is still generic) large-scale rockets because the domestication rates of previous N-I and N-II rockets were only 50-60%, including H-I Within the first grade department is imported from the United States, but Japan made some improvements to H-Ⅰ, that Ⅱ