The rotorwash characteristics of eleven different types of tiltrotor and tiltwing aircraft in hovering flight are presented for comparison purposes. Rotorwash characteristics that were quantified include the mean and peak outwash velocity profiles off the left wing position (azimuth = 270 degrees) and nose position (azimuth = 0 degrees). Maximum values from each of the peak velocity and peak dynamic pressure profiles are also presented as a function of distance from the rotorcraft along both the 0 and 270 degree azimuths. Calculated personnel overturning forces are presented along both azimuths for a six foot tall person. All documented results were calculated with the ROTWASH analysis program. Flight test data, as correlated with the analysis program, are presented for the XV-15 tiltrotor and the CL-84 tiltwing. These hover characteristics do not represent the worst cast scenario characteristics which would be expected at a vertiport. Scenarios involving ambient winds and maneuvering flight near hover generate higher rotorwash velocities. Unfortunately, the identification and prediction of worst case scenario results for comparison purposes is not presently possible.
Evaluation of Rotorwash Characteristics for Tiltrotor and Tiltwing Aircraft in Hovering Flight
1990
278 pages
Report
No indication
English
Aerodynamics , Applications programs (Computers) , Downwash , Flight characteristics , Hovering , Rotorcraft aircraft , Tilt rotor aircraft , Tilt wing aircraft , V/stol aircraft , Aircraft maneuvers , Cl-84 aircraft , Computational fluid dynamics , Correlation , Flight tests , Flow distribution , Velocity distribution , Xv-15 aircraft