(US5298818-A)      A thrust generator includes a superconducting solenoid magnet (1), a thrust duct (2) and a power supply device (3). The spiral portion of the thrust duct is inserted in the hollow interior of the superconducting solenoid magnet. An anode (8) and cathode (9) are fixed at both inner walls of the thrust duct. Electric power is supplied to an electromagnetic fluid (10) in the duct to produce a magnetic field and a Lorentz's force (f).    The electromagnetic fluid flows into the thrust duct through an opening (6a) at the inlet end portion (6) where it is urged continuously by the Lorentz's force and jetted outside from an opening (7a) at the outlet end portion (7). The reaction of the jet force becomes a thrust. A Lorentz's force, generated by the superconducting solenoid magnet and by the current (J) flowing through each current feed element, rotates and drives the thrust duct.    (JP3045754-B2)      The thrust generator has a helical thrust duct (2) rotatably supported inside a hollow portion of a superconductive magnet (1) of a solenoid coil type. Positive and negative electrodes (8 and 9) are bonded to the inner surface of the thrust duct (2) to permit the flow of an electromagnetic field such as sea water. Electronic current is supplied from a current feeder to the electromagnetic fluid inside the thrust duct (2) so as to generate a Lorentz force F with a magnetic field. The electromagnetic fluid flows into the thrust duct (2) through an opening (6a) at the inlet end portion (6), receives continuously the Lorentz force F inside the thrust duct (2), is accelrated by this force F, and is jetted outside from an opening (7a) at the outlet end portion (7). The reaction of the jet force becomes a thrust.    The Lorentz force F is also generated in each element of the current feeder by the magnetic field B generated by the superconductive magent (1) and the electrode current (J) flowing through each element, and rotates and drives the thrust duct (2). A fluid friction loss between the inner surface of the thrust duct (2) and the electromagnetic fluid is reduced due to the rotation of the thrust duct (2).