N-I

Manufacturer: Mitsubishi Heavy Industries · Maiden flight: 9 September 1975 · Wikipedia (opens in new tab)

The N-I or N-1 was a derivative of the American Thor-Delta rocket, produced under licence in Japan. It used a Thor-ELT first stage, a Mitsubishi Heavy Industries-designed LE-3 engine was used as a second stage, and three Castor SRMs. Seven were launched between 1975 and 1982, before it was replaced by the N-II.