For an engine to survive all the rocking and rolling it produces, those forces need to be counterbalanced with equal—or at least nearly equal—forces. Today, most production-car engines with more than ...

A special type of brushless motor is called a limited-angle torquer (LAT). LATs are constrained to produce torque through a rotation angle of less than 180°. But they are widely used to operate ...

CHARLES DRAPER, WHOSE EPONYMOUS LABORATORY developed the guidance systems for Apollo spacecraft, referred to inertial navigation as “astronomy in a closet.” It is based on a celestial reference system ...