LOW-SPEED WIND-TUNNEL MEASUEEMENTS OF THE OSCILLATORY LATERAL STABILITY DERIVATIVES FOR A MODEL OF A SLENDER AIRCRAFT (HP 115) INCLUDING THE EFFECTS OF FREQUENCY PARAMETER

摘要

Low-speed tunnel tests on a model of the HP 115 aircraft have provided a complete set of lateral derivatives for a range of frequency parameters, Over a range appropriate to full scale flight, the effects of frequency parameter are small, but for very high values there is a marked reduction in the derivatives np , yp and λv . Some information is included on the derivatives nv•, yv• and λv•, and there is evidence that the virtual inertias are about the same wind-on and wind-off.nThe Paper also describes some recent improvements in technique.