Signature of Author C r p m othesis Supervisor Chairmar, Departmental Vommittee on Graduate Students

The author wishes to express his gratitude and appreciation to the following persons and organizations who aided directly or indirectly in the development of this thesis: To Dr. C. S. Draper, who in a large measure is directly responsible for the opportunity for carrying on this investi-gation. To the United States Air Forces for supplying the airplane used in this investigation and for assigning the author to Mass-achusetts Institute of Technology for graduate training. To Professor R. C. Seamans, Jr., for his helpful and con-structive supervision and encouragement. To Dr. J. H. Laning, Jr. and Dr. Elmer Frey for many help-ful and practical suggestions. To the staff of the Tracking Control Project of the Instru-mentation Laboratory for invaluable technical assistance an