During 1944 an unknown number of 45 cm naval rockets were transported to Luzon via the Battleship Ise along with Imperial Japanese Navy Commander Hanamizu, who was in charge of Japanese Navy rocket development.

It was a spin-stabilized rocket that was filled with 39 sticks of solid propellant weighing 59 kg (130 lb) and the exhaust gasses were forced through six venturis that were angled at 18° to impart spin.

[1] The body of the motor, warhead and nose cone were all made from 19 mm (.75 in) rolled steel and were welded together.

[1] The launcher was a two-wheeled wooden cart with a metal baseplate that held the base of the rocket.

Four more rockets were later tested at Aberdeen Maryland proving grounds and they were able to reach 5 km (3.1 mi).