Pulsejet differs from the ramjet in that combustion him in the chamber passes pulses. A special device - a distribution mechanism - periodically isolates the combustion chamber from the diffuser. This occurs in the constant or semiclosed screen.

All of the jet engine, read here.

When a certain amount of combustion air and the fuel pressure p and the temperature t in the combustion chamber are increased. Then the next cycle of preparation and combustion portion of the fuel. Pulsating engine, unlike the ramjet can operate stably and at low speeds. Specific weight of the engine was 0,15-0,3 kg / kg of thrust.

Pulsejet firsts in Germany. That's where good results were obtained, will allow an effective weapon - cruise missile V-1. The characteristic crackling sound of the rocket motor horrifies residents of London during the Second World War. To destroy a cruise missile in the air was very difficult: it is, as a rule, or fell into the intended target or hit the random object.

A small amount of work related to the problems of pulsating air-jet engines was also carried out in the Soviet Union. Unlawfully repressed, B. S. Stechkin, while in detention (aircraft factory-16, Kazan), tried to create an air-jet pulsating air-jet engine. This engine was supposed to be used as an auxiliary to the main piston, it had to work only at take-off of an airplane, to play the role of an engine. Work on this engine, which was given the designation of the US (Stechkin accelerator), was discontinued in 1943 (then the famous scientist was amnestied). Specialists joked: "He was released early, and for this reason they were left without an accelerator."