Author: United States. National Aeronautics and Space Administration
Publisher:
Published: 1959
Total Pages: 788
ISBN-13:
DOWNLOAD EBOOK →Author: United States. National Aeronautics and Space Administration
Publisher:
Published: 1962
Total Pages: 1012
ISBN-13:
DOWNLOAD EBOOK →Author: R. L. Stapleford
Publisher:
Published: 1965
Total Pages: 174
ISBN-13:
DOWNLOAD EBOOK →The hover analysis considers pilot attitude and position control tasks in the presence of horizontal gusts. The effects of each of the stability derivatives on the difficulty of the control tasks and on the closed-loop gust responses are determined. It is clearly shown that the handling qualities studies of control sensitivity and angular damping must consider the influences of M sub u (or L sub v) and should include gust inputs. These conclusions are substantiated by previous variable-stability-helicopter experiments. The effects of vehicle size and geometry are investigated by several approaches. The key result of increasing size is found to be a reduction in M sub u and L sub v which can, in turn, lower the requirements for control power and damping. The handling qualities during transition of two vehicles, a tilt duct and a tilt wing, which were previously tested on a simulator are analyzed. It is shown that both trim control and perturbations about the trim conditions must be considered. In fact, part of the increased difficulty in landing transitions, in comparison with takeoff transitions, is due to more difficult trim control; the much more stringent position control requirements in landing are also a contributing factor.
Author: Kenneth W. Goodson
Publisher:
Published: 1962
Total Pages: 52
ISBN-13:
DOWNLOAD EBOOK →"An investigation of the aerodynamic characteristics of a powered semispan tilting-shrouded-propeller configuration has been conducted in the 17-foot test section of the Langley 300-MPH 7- by 10-foot tunnel. The wing had an aspect ratio of 2.67 (based on wing span of 60 inches), a taper ratio of 0.67, and an NACA 2418 airfoil section with a 15-inch-diameter shrouded propeller mounted on the tip. The test results show that large nose-up pitching moments are obtained at transitional speeds of about 40 knots and duct angle of about 70°. Decelerating flight procedures further increases in the nose-up moment. Ground proximity reduces the nose-up pitching moments. The large nose-up moments can be trimmed by use of duct-exit control vanes. The results show that unloading the duct (shroud) by flying at a wing angle of attack of 15° reduces the power required by about 30 percent at 50 knots. Duct-lip stall produces large increases in power required. The results in general show that full-scale aerodynamic simulation can be made with small-scale wind-tunnel models if duct-lip separation at low Reynolds numbers is avoided."--Summary.
Author: United States. National Aeronautics and Space Administration
Publisher:
Published: 1962
Total Pages: 718
ISBN-13:
DOWNLOAD EBOOK →Author: North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development
Publisher:
Published: 1963
Total Pages: 130
ISBN-13:
DOWNLOAD EBOOK →Author: United States. Superintendent of Documents
Publisher:
Published: 1961
Total Pages: 1284
ISBN-13:
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