سعید جامعی

Power efficiency of a system is one of the impo rtant criterio ns to achieve a green society as an efficient system lessens harmful emissions considerably, thus to find ways to reduce power is very significant. A noteworthy fraction of harmful emission is done by various transp rt systems, WIG craft is relatively new concept of transpo rtation, can have a fruitful future as it is more efficient than equivalent airc raft and quicker than equivalent marine vessels, like any other modes of transpo rtation, power efficiency of a WIG is very impo tant, especially today when achieving a greener so ciety is not an option but the only way for a sustainable human civilizatio n. The aero dynamic fo rce of a specific WIG depends on a certain minimum take o ff speed which is directly related with thrust power , so to reduce the amount of requir d energy, it is necessary to reduce the drag resistance during take off , In this paper the effect of steps bellow hull on resistance of a 2 seated WIG is discussed and analyzed by changing po sition and dimension of steps later it is compared with resistance hull without steps .finally how it can reduce the amount of harmful emission thro ugh reducing power is investigated.