Sergey Chaplygin

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Sergey Alexeyevich Chaplygin (Russian: Серге́й Алексе́евич Чаплы́гин; April 5, 1869–October 8, 1942) was a Russian physicist, mathematician, and mechanical engineer. He is known for mathematical formulas such as Chaplygin's equation. He graduated in 1890 in Moscow University, and later became a professor. He taught mechanical engineering at Moscow's Woman College in 1901, and of applied mathematics at Moscow School of Technology, 1903.

Chaplygin's theories were greatly inspired by N. Ye. Zhukovsky, who founded the Central Institute of aerodynamics. His early research consisted of hydromechanics. His "Collected Works" in four volumes were published in 1948.

The lunar crater Chaplygin is named in his honor.