The helical-type superconducting electromagnetic ship thruster is composed of a solenoid-type superconducting magnet, coaxial electrodes, a flow-guide, a flow-rectifier, and a helical insulation wall. Calculations of characteristics of the large scale helical-type performance are carried out on the basis of a simple model; It is supposed that (1) seawater (27°C) is incompressible, (2) voltage drop at the surface of electrodes and electrolysis products are negligible, (3) magnetic field and electric current are constant inside the thruster, and (4) the thruster is similar figures to the test thruster examined. As a couple of results of calculations, it is found that the thruster efficiency quickly increases with the length of electrode up to about 5 m and then goes up to about 0.9. The thruster efficiency also peaks at a certain point (～ 0.6 m) and then falls as length of pitch of the helical insulation wall increases.
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