The invention discloses a multi-purpose
solid propeller with adjustable propelling force. The multi-purpose
solid propeller comprises electric-control
solid propellant units, an outer
electrode, innerelectrodes, an insulating layer, a heat-insulating layer, a
combustion room and a spray tube, wherein the outer
electrode is arranged in the
combustion room; the outer
electrode is uniformly distributed with a plurality of circular-hole spaces on the basis of one integral
metal cylinder for separately placing the plurality of circular tube shaped electric-control solid
propellant units; each inner electrode consists of a plurality of
metal cylinders which are separately embedded into the corresponding circular tube shaped electric-control solid
propellant units; and each electric-control solid propellant unit is in tight contact with the outer electrode and the corresponding inner electrode. According to the multi-purpose solid
propeller disclosed by the invention, each inner electrode isconnected with the outer electrode to form a
control circuit, and each circuit is controlled to open and close, so that ignition,
combustion and
flameout of each electric-control solid propellant unit are controlled. Voltages at the two ends of each inner electrode and the outer electrode are controlled, so that a combustion rate of each propellant unit is controlled, and therefore, in each working pulse, propelling force of the propeller is adjustable.