@astrumi123: Huge water rocket was successfully launched at Tama river bed, Japan. Japanese students tested 12.3m long rocket to fly for new Guiness world record. It flew over 50m. They have Guiness world record of 7.7m in length of water rocket, flew over five metes high. #waterrocket #waterrocketchallange #hugerocket #超巨大 #ペットボトルロケット