Titlebook: Radiation Health Risk Sciences; Proceedings of the F Masahiro Nakashima (Associate Professor),Noboru Ta Conference proceedings 2009 Springe

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Noboru Takamura,Akira Ohtsuru,Hiroki Ozawa,Shunichi Yamashitae one seems to be: a propeller is unsteady when no inertial reference frame exists with respect to which the induced flow is time independent. This however is not appropriate because then nearly all conceivable propulsion systems are unsteady with the only exception probably of the sails of a yacht

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