Exploit
发表于 2025-3-30 10:18:46
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
无能的人
发表于 2025-3-30 13:41:46
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