Two-stroke-cycle engines with unsymmetrical control diagram : supercharged engines
A 1939 NASA technical report, compiled from a series of German engineering papers, on supercharged two-stroke engines with unsymmetrical valve timing, written for engine designers and aeronautical engineers. The pictures are dense technical charts: piston-path and port-timing diagrams, pressure curves plotted against crank angle, and scavenge-air and boost graphs with labelled curves, which a designer might use as a reference for graphing and diagram layout.
