Accession Number : AD0888983

Title :   An Investigation of Direct Sideforce Control for Improving Maneuver Capability of Attack Aircraft.

Descriptive Note : Final rept. 15 Jan-31 Jul 71,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA RESEARCH AND ENGINEERING DIV

Personal Author(s) : Kriechbaum, Gerhard K. L. ; Garrett, John L. ; Larson, Robert R. ; Vincent, James H.

Report Date : OCT 1971

Pagination or Media Count : 185

Abstract : The feasibility of employing direct sideforce control devices (DSFC) to enhance the maneuverability and weapon delivery accuracy of high-speed attack aircraft was investigated. Linear analysis, piloted simulation, and an implementation study were performed. Pilot-in-the-loop analyses show that connecting the direct sideforce controller to the pilot's aileron and rudder controls, combined with heading rate and side acceleration feedback, is the best method for integrating the DSFC into the control system. By decoupling the airplane's lateral and directional motions and using DSFC, rapid heading changes can be made with the rudder pedals alone, without rolling and sideslipping the airplane. The flight simulation clearly demonstrates the airplane's improved close-in maneuvering and target tracking capability with the DSFC. Very substantial circular error probable (CEP) improvements over the basic airplane without sideforce control were achieved. The implementation study shows that deflecting a dedicated aerodynamic control surface ahead of the center of gravity, in conjunction with the rudder, to balance the yawling moment, produces the desired sideforce most efficiently. (Author)

Descriptors :   *ATTACK BOMBERS), (*FLIGHT CONTROL SYSTEMS, (*DIVE BOMBING, FLIGHT CONTROL SYSTEMS), SIDESLIP, MANEUVERABILITY, ACCURACY, AERODYNAMIC CONTROL SURFACES, FORCE(MECHANICS), SIMULATION, TRACKING.

Subject Categories : Bombers
      Attack and Fighter Aircraft
      Fire Control and Bombing Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE