そして改良を重ね、１７８５年８月２１日
京橋から飛び立った幸吉はついに飛行することができた。
Then Koukichi began to design the new fied-wings for his next challenge.
He selected the test place where was the bridge named Kyobashi
over the Asahigawa River.
In Aug.21, 1785, Koukichi succeeded to fly about 30 meters,
he was 28 years old.
