rotary engine, internal-combustion engine in which the combustion chambers and cylinders rotate with the driven shaft around a fixed control shaft to which pistons are affixed; the gas pressures of combustion are used to rotate the shaft. Some of these engines have pistons that slide in toroidal (doughnut-shaped) cylinders; others have single- and multiple-lobed rotors.
OBJ (OBJ, filesize: 38.3 MB), STP (STEP, filesize: 49.6 MB)