Longitudinal Handling Qualities for Hovering
Author: E. Seckel
Publisher:
Published: 1961
Total Pages: 74
ISBN-13:
DOWNLOAD EBOOKFlight tests with a variable stability helicopter were conducted to determine the effect of certain stability parameters on precision hovering in atmospheric turbulence. A course was devised to emphasize the precision control required to pick up sling loads, deliver litter patients, dunk Sonar buoys, Etc., under gusty conditions. The effect of velocity stability was determined to be of particular importance. The most important effect is that the pitching disturbances felt by the pilot due to turbulence are essentially proportional to this parameter. Secondary effects are the control gradient for trim at low speed, and the dynamic stability. The range of velocity stability variation was from practically zero, which was considered very favorable, to values that were unacceptable or even disastrous. Certain pilot ratings did not correspond to previously published handling qualities criteria. Investigation disclosed that higher angular damping and greater control effectiveness are desired by pilots for precision hovering than had been determined. (Author).