U.S. Centennial of Flight Commission home page
Cutaway view of a piston engine built by Germany's Gottlieb Daimler. Though dating to the 19th century, the main features of this motor appear in modern engines.

Cutaway view of a piston engine built by Germany's Gottlieb Daimler. Though dating to the 19th century, the main features of this motor appear in modern engines.

Credits - NASA