09-10-2014, 02:40 PM
Abstracts: In designing a hovercraft, there are many factor should be considered, such as skirt design or plenum. We have to consider also the materials, structure, thrust, drag, dynamic effect, and stability. Due the hovercraft using rudder mechanism to steer, the fan must produce the sufficient air speed for the rudder to be effective as a control surface. As a result, a hovercraft cannot generate a pure torque and is thus unable to turn in place. The rudder is also mechanically limited and cannot produce force directed along the lateral direction of the hovercraft. For these reasons, a hovercraft with is an under actuated system. In this project, control system for steering a hovercraft and provide lift for the hovercraft will be studied. Engineering software, AUTOCAD will be used in designing the control system. This project is the first step to design and build a hovercraft control system.There are two types of fans are used in hovercraft. First one is propulsion fan and second is power lift fan. Propulsion fan is mounted on backside.it is used to get a forward motion.The shroud is mounted over the propulsion fan.it should contain large volume of air.so ,we get a required thrust and effective steering.Power lift fan is generally mounted on front side.When this fan is rotating, it sucked the air from the surrounding and trapped it into a plenum chamber and when pressure below the craft will be greater then the itself weight ,the craft will rise-up as soon as the fan is rotating the craft will rise up. It should provide maximum air in skirt.