Pulse propulsion machine for repeatedly generating explosions and for converting chemical energy into kinetic energy from outflowing exhaust gases of the explosions, in particular for generating thrust for propulsion of an aircraft, comprising • a combustion chamber, • at least one supply line for supplying a flowable explosive material or components, which form an explosive material when mixed, to the combustion chamber; • a discharge device for the directed discharge of a gas pressure generated by ignition of the explosive material in the combustion chamber, • a movable nozzle control element for partially or completely closing the discharge device, • an adjusting element which is configured to continue to open the discharge device after the discharge device has been opened and during an outflow of explosion gases through the discharge device and thereby to set at least approximately the optimum, ideal area ratio between the nozzle outlet area and the nozzle inlet area, characterized in that the combustion chamber has a variable volume and in that the discharge device has a plurality of partial nozzles for releasing the gas pressure, and a position of the partial nozzles is adjustable by the adjusting element, and with the sum of the partial nozzles, a nozzle is realized which ensures that the optimum, ideal area ratio between the nozzle outlet area and the nozzle inlet area is always at least approximately adjusted during an entire discharge time, wherein each of the partial nozzles has a partial valve seat and a partial valve body, and a partial nozzle inlet area is determined by the position of the partial valve body with respect to the partial valve seat, wherein the nozzle control element determines the positions of the partial valve bodies with respect to the partial valve seats, and thus the nozzle control element is arranged to vary a total nozzle entry area, which is the sum of the partial nozzle entry areas, wherein the adjusting element is configured to control a movement of the nozzle control element to adjust the total nozzle entry area at least approximately in accordance with said ideal area ratio. • a combustion chamber, • at least one supply line for supplying a flowable explosive material or components, which form an explosive material when mixed, to the combustion chamber; • a discharge device for the directed discharge of a gas pressure generated by ignition of the explosive material in the combustion chamber, • a movable nozzle control element for partially or completely closing the discharge device, • an adjusting element which is configured to continue to open the discharge device after the discharge device has been opened and during an outflow of explosion gases through the discharge device and thereby to set at least approximately the optimum, ideal area ratio between the nozzle outlet area and the nozzle inlet area, characterized in that the combustion chamber has a variable volume and in that the discharge device has a plurality of partial nozzles for releasing the gas pressure, and a position of the partial nozzles is adjustable by the adjusting element, and with the sum of the partial nozzles, a nozzle is realized which ensures that the optimum, ideal area ratio between the nozzle outlet area and the nozzle inlet area is always at least approximately adjusted during an entire discharge time, wherein each of the partial nozzles has a partial valve seat and a partial valve body, and a partial nozzle inlet area is determined by the position of the partial valve body with respect to the partial valve seat, wherein the nozzle control element determines the positions of the partial valve bodies with respect to the partial valve seats, and thus the nozzle control element is arranged to vary a total nozzle entry area, which is the sum of the partial nozzle entry areas, wherein the adjusting element is configured to control a movement of the nozzle control element to adjust the total nozzle entry area at least approximately in accordance with said ideal area ratio.