抄録
Consideration on the relation between the military technology and the non-military technology is performed by comparison between two flying boats. One is the flying boat type 2 of the Japanese Navy, which was used for fighting in the World War II. The other is the type US-1 of the Maritime Self-Defense Force of Japan, which has been used to rescue the people who meet with a disaster on sea. First, the flying boat type 2 is explained. By agreement of the disarmament conference in 1922, the former Japanese Navy determined to produce big flying boats to compensate the lack of the marine power. Kawanishi Aircraft Co. (next ShinMaywa Industries Ltd.) received the request from the navy and developed the flying boat type 2, which succeeded in the first flight in 1942. It had the maximum high performance as that time. Next, the rescue flying boat US-1 is explained. Although it was a new type of flying boat of which ShinMeiwa Industries Ltd. received an order from the Maritime Self-Defense Force, the base was the antisubmarine patrol flying boat PS-1, whose developers were the same as the developers of the type 2. Therefore, as for the origin of design technique, it is the type 2 and the appearance also resembles it. After describing that the rescue activity of the rescue flying boat is usually done with the (antisubmarine) patrol aircraft (PS-1, P2-J, P3-C, etc.), the meaning of classifying the technology into military one and non-military one is discussed. Finally, it is concluded that evaluation of the technology is "relative" and is done by not the engineer but the society and the citizens.
