A pulse jet engine (or pulsejet) is a type of jet engine in which combustion occurs in pulses. pulsejet engines can be made with few or no moving parts, and are capable of running statically. pulsejet engines are characterized by simplicity, low cost of construction but high vibrations and noise levels. pulsejet fuel efficiency is a topic for hot debate, as efficiency is a relative term. while the thrust-to-weight ratio is excellent, thrust specific fuel consumption is generally very poor. our objectives are: -to reduce noise by testing different cross-sections of nozzle. -analyzing vibration.