An empirical method has been developed to predict the propulsive-induced forces on a V/STOL aircraft hovering in proximity of the ground. This method is applicable to configurations employing two, three, or four rectangular exhausts. Planform contour, nozzle pressure ratio, and lift improvement devices are considered. Accuracies on the order of one percent of propulsive thrust are demonstrated. (Author)
An Empirical Method For Estimating the Effect of Ground Proximity on the Jet-Induced Lift of V/STOL Aircraft Employing Rectangular Jets
1981
154 pages
Report
No indication
English
Aircraft , Aerodynamics , Vertical takeoff aircraft , Short takeoff aircraft , Ground effect , Mathematical models , Mathematical prediction , Hovering , Jet engines , Turbofan engines , Lift , Configurations , Planform , Flow fields , Air flow , Exhaust gases , Rectangular , Jet fountain lift , Suckdown