Scratch built from plan at 1:100 scale. Length is 8'9" and sailing weight 70kg. Two triple props and a central 4 blade prop all about 50mm. Battery is 48 AHr. Sails like the real ship and needs as much space. Stopping distance is about 30' from full speed. Need to fit the sound unit to warn other sailors! Using Action Noisy Thing with a Technobots 20W amp and large 80W speaker from my sons old car. Think I will get the switcher unit from Action to work the Fog Horn and other sounds. (Motor: MMI 555 (mk2)) (ESC: Mtronik Viper 15) (10/10)