Author: Scott C. AsburyPublisher:
ISBN:
Category :
Languages : en
Pages : 174
Book Description
Multi-axis Thrust-vectoring Characteristics of a Model Representative of the F-18 High-Alpha Research Vehicle at Angles of Attack from 10 Degrees to 70 Degrees
Author: Scott C. AsburyMultiaxis Thrust-Vectoring Characteristics of a Model Representative of the F-18 High-Alpha Research Vehicle at Angles of Attack from 0 Deg to 70 Deg
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781723218767
Category :
Languages : en
Pages : 180
Book Description
An investigation was conducted in the Langley 16-Foot Transonic Tunnel to determine the multiaxis thrust-vectoring characteristics of the F-18 High-Alpha Research Vehicle (HARV). A wingtip supported, partially metric, 0.10-scale jet-effects model of an F-18 prototype aircraft was modified with hardware to simulate the thrust-vectoring control system of the HARV. Testing was conducted at free-stream Mach numbers ranging from 0.30 to 0.70, at angles of attack from O' to 70', and at nozzle pressure ratios from 1.0 to approximately 5.0. Results indicate that the thrust-vectoring control system of the HARV can successfully generate multiaxis thrust-vectoring forces and moments. During vectoring, resultant thrust vector angles were always less than the corresponding geometric vane deflection angle and were accompanied by large thrust losses. Significant external flow effects that were dependent on Mach number and angle of attack were noted during vectoring operation. Comparisons of the aerodynamic and propulsive control capabilities of the HARV configuration indicate that substantial gains in controllability are provided by the multiaxis thrust-vectoring control system. Asbury, Scott C. and Capone, Francis J. Langley Research Center F-18 AIRCRAFT; THRUST VECTOR CONTROL; RESEARCH VEHICLES; NOZZLES; ANGLE OF ATTACK; CONTROLLABILITY; FREE FLOW; MACH NUMBER; PRESSURE RATIO; TRANSONIC WIND TUNNELS; WING TIPS...
MULTIAXIS THRUST-VECTORING CHARACTERISTICS OF A MODEL REPRESENTATIVE OF THE F-18 HIGH-ALPHA RESEARCH VEHICLE AT ANGLES... NASA-TP-3531... M.
Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle (HARV), and Comparisons to the Basic F-18 and Predicted Derivatives
Author: Kenneth W. IliffPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 92
Book Description
The F-18 High Alpha Research Vehicle (HARV) Parameter Identification Flight Test Maneuvers for Optimal Input Design Validation and Lateral Control
Author: Eugene A. MorelliPublisher:
ISBN:
Category :
Languages : en
Pages : 54
Book Description
Flight tests maneuvers are specified for the F-18 Alpha Research Vehicle (HARV). The maneuvers were designed for open loop parameter identification purposes, specifically for optimal input design validation at 5 degrees angle of attack, identification of individual strake effectiveness at 40 and 50 degrees angle of attack, and study of lateral dynamics and lateral control effectiveness at 40 and 50 degrees angle of attack. Each maneuver is to be realized by applying square wave inputs to specific control effectors using the On-Board Excitation System (OBES). Maneuver descriptions and complete specifications of the time/amplitude points defining each input are included, along with plots of the input time histories.
Parameter Identification Flight Test Maneuvers for Closed Loop Modeling of the F-18 High Alpha Research Vehicle (HARV)
Author: Thrust Vectoring for Lateral-directional Stability
Author: Validation of the F-18 High Alpha Research Vehicle Flight Control and Avionics Systems Modifications
Author: Spin-Tunnel Investigation of a 1/28-Scale Model of the NASA F-18 High Alpha Research Vehicle (HARV) with and Without Vertical Tails
Author: F-18 High Alpha Research Vehicle (Harv) Parameter Identification Flight Test Maneuvers for Optimal Input Design Validation and Lateral Control Effectiveness
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722226800
Category :
Languages : en
Pages : 48
Book Description
Flight test maneuvers are specified for the F-18 High Alpha Research Vehicle (HARV). The maneuvers were designed for open loop parameter identification purposes, specifically for optimal input design validation at 5 degrees angle of attack, identification of individual strake effectiveness at 40 and 50 degrees angle of attack, and study of lateral dynamics and lateral control effectiveness at 40 and 50 degrees angle of attack. Each maneuver is to be realized by applying square wave inputs to specific control effectors using the On-Board Excitation System (OBES). Maneuver descriptions and complete specifications of the time/amplitude points define each input are included, along with plots of the input time histories. Morelli, Eugene A. Unspecified Center NAS1-19000; RTOP 505-64-52-01...