The restraining tubing boat belongs to the technical field of jet propelled boat, which should use a high speed centrifugal pump or other high speed jething facillity. The restraining tubes are placed below draft mark on the head of the jet propelled boat to restrain the water on the head of the boat, and the water in the restraining tubings are jetted to the rear or flanked to rear by a centrifagal pump or other means, and a pushing effort to be formed at the same time. The sailing range of the jet boat may be extended greatly to overcome the wave forming resistance in the restriction of raising the sailing speed of the jet boat. The sailing speed is determined by the rate of inlet the water into the restraining tubings, the width and height of the boat may be increased greatly, and it costs less to build this kinds of boat. It may be based on the basic principles of this restraining tubing boat to rebuilt the existing jet propelled boat to increase the sailing speed. |