ROLL CONTROL

If соф — od and £ф — so that the two quadratic terms in (12.9,1) cancel, or if only the initial vehicle roll response is considered, then for cases where ljTs is negligible the roll-to-aileron transfer function reduces to

which corresponds to the single-degree-of-freedom approximation (9.7,7). It has been found that this transfer function affects pilot ratings significantly. When considering this response it is convenient to look at closed-loop and open-loop control situations separately. Closed-loop control tasks involve the continuous monitoring of system error by the pilot and his responses to this stimulus. Examples of this type of control include formation flying, instru­ment flight, and landing. Open-loop control differs in that a previously – learned pattern is utilized to respond to a particular flight situation. No continuous monitoring of system error as such is involved and often the maneuver is of very short duration. Examples of this form of control are obstacle avoidance, rapid turn entry, and recovery from sudden upsets.