Stefan Drzewiecki (b. July 26, 1844 in Kunka , Podole - April 23, 1938 in Paris) was a Polish scientist, journalist, engineer, constructor and inventor.
Drzewiecki mainly in aviation and ship building - he developed theory of gliding flight, developed a method for manufacture of ship and plane propellers (1892), presented a general theory for screw-propeller thurst (1920).
His work "Theorie generale de l'helice" (1920), was honored by the French Academy of Science as a fundamental work in the development of modern propellers.
