A lot of devices, which people use for fun, as energy source use electricity or fossil fuel. The goal of our thesis is to devise the system,which use kinetic energy for catapult power. We devise construction for this system and calculate all the important parameters. The theoretical part includes descriptive hydraulic components. We made device prototype and did all the measurments of our device in the laboratory. The system includes hydraulic accumulator. Two pedal pumps charging he hydraulic accumulator. We remade pumps in pedal, because they have got more power at inflation. As first part of our mesurements, we know: the system can fill hydraulic accumulator-volume of one liter to working pressure 15MPa in 30 seconds. As second part of our work, we measured volume of extracted oil in the dependence of precharge pressure and working pressure. Now we know: suitable choice of precharge pressure is imporatnt for quantity of extract oil from accumulator.