Design and Construction of an Unmanned Craft with Capability of Installing Two Operation Mechanism in the Propulsion

Increasing speed, decreasing weight and having sufficient resistance are the most important parameters in design and construction of unmanned crafts. Current model of this fast craft has been constructed in the scale 1/15 of similar craft, which is a single-body racer craft. The craft design is preformed in various software such as Maxsurf marine software. The material of the craft is aluminum and has propeller propulsion system. Two types of steering operation mechanisms for the propulsion system are designed and tested, which are: steering by rudder and steering by propulsion system of moving shaft, in which provides capability of steering movement for the craft. At the first mechanism, craft maneuver is via deviation of positive flow of the propeller on the blade of rudder. But maneuver in the second mechanism is possible by positive propeller thrust (propeller movement laterally), which leads to increase of maneuver efficiency. In this craft, 2 motor with 1300 watt power are used. This craft considering the body shape and propulsion system can achieve up to 14 Knots speed. In rodent to examine propulsion system operation, speed and maneuver test have been done to the craft. Also the test of proper length position of center of mass in order to reduce porpoizing has been done, which finally, the result is 30 cm from the toe (considering length of craft is 95 cm). This craft has the capability of remote control and smart control in spiral and circular path. In this paper, the design, construction and testing stages of the craft has been done.