Part of the ground instruction given flying cadets, at Cal-Aero Academy’s air corps training center, Oxnard, Calif., consists of manipulating controls in a cockpit, called a “co-ordinator,” which is reproduced from a training plane. For the first lessons, the stick and foot controls are locked together, thus forcing the student to co-ordinate his hands and feet. Later the connection is removed and the cadet practices co-ordination without mechanical assistance, just as he would in flying an airplane. If he makes a mistake in co-ordination, a bell rings and does npt stop until the error is corrected.