JPS6416495A - Steering gear for small jet propeller boat - Google Patents

Abstract

PURPOSE:To make a turning action possible to be brought into full play at time of low speed by installing a propeller in a stern part, also installing a handle in the upper part of a stem part, while installing a rudder being operated by this handle projectingly in a stem bottom, and making this rudder so as to be situated in the more upper part than a water surface in a high-speed sailing state. CONSTITUTION:An engine is driven, water is sucked out of a ship's bottom, and water is jetted in the stern rearward toward the specified direction from a nozzle 6 whereby sailing takes place. At this time, since a rudder 5 is situated in the more lower part than the draft line in a low-speed sailing state, steering force is brought into full play even by the rudder 5 being operated together with the nozzle 6, and that since the rudder 5 and the nozzle 6 come to the opposite direction to each other, turning force is large enough, even if the engine is stopped, water out of the nozzle 6 is no longer jetted and the steering force is brought to nothing by the nozzle 6, the steering force can be showed by the rudder 5. Moreover, since the rudder 5 is situated in the more upper part than the draft line 11 in a high-speed sailing state, such a possibility that propulsion resistance is produced by the rudder 5 is prevented from occurring. At time of high speed, steerability is so good so that it is good enough with a turning action only by means of the nozzle 6.