- Who
- NPO Showa Gakuen
- What
- 7.72 m x 72.5 cm dimension(s)
- Where
- Japan (Taiki town, Hiroo)
- When
The largest water rocket measures 7.72 m (25 ft 3.9 in) tall and 72.5 cm (2 ft 4.5 in) in diameter, and was created and launched by NPO Showa Gakuen (Japan) in Taiki Town, Hokkaido, Japan, on 2 August 2022.
The students were successful on their 3rd try on the attempt day.