Vaughn College of Aeronautics and Technology

About: Vaughn College of Aeronautics and Technology is a education organization based out in New York, New York, United States. It is known for research contribution in the topics: Gravitational microlensing & Planetary system. The organization has 727 authors who have published 708 publications receiving 14082 citations. The organization is also known as: College of Aeronautics.

Generation of axi-symmetric body shapes in subsonic flow by means of polynomial distributions of sources and doublets along the axis of symmetry

Abstract: A method is presented for determining the potential flow around bodies of revolution, at incidence, in uniform, incompressible, flow. This method utilises polynomial distributions of both sources and doublets, in the manner of Fuhrmann, and gives considerable advantage over existing techniques. In particular, when compared with the method of Nielsen, in a typical case, the computer storage requirement is reduced by a factor of eleven. Compared with panel methods the saving is very much greater. Unlike the method of Landweber, both body surface and flow field conditions are obtainable and it would appear that the new method is ideally suited to the ‘store trajectory’ application in place of the existing discrete source method.

The Part Played by Wind Tunnels in Modern Aeronautics

Abstract: The wind tunnel has been the main instrument for experimental research in aeronautics since the turn of the century and its history is as brief as powered flight itself. It has always played a leading rdle in aeronautics right from the time of the Wright Brothers to the present day. The early form of wind tunnels as developed at the National Physical Laboratory and other research establishments have been replaced over the years by larger and more elaborate facilities, each having a particular speed range and specific role in aeronautical research and development. Modern wind tunnels having continuous operation of the type installed at the Royal Aircraft Establishment involve powers of up to 100 000 h.p. and cost in the neighbourhood of £10 000 000. In spite of this cost it is a sobering thought that, if anything, the overall cost of each data point is less today than it was in the early days of aeronautics. Such tunnels are highly complex instruments for research and development and although they play a role similar in many respects to that of a computer, they have the advantage of always dealing with a real fluid. Indeed no known computer could cope with the range of problems that can be solved in a wind tunnel, ranging from such complex problems as the structure of turbulent flow to the pressures in separated flow regimes, to quote just two examples. This fact must always be kept in perspective when arguments are presented for more and more work on digital computers to solve basic fluid motion problems. Of course we cannot overlook the problems of interpretation of wind tunnel data and the difficulties encountered in extrapolating these data to flight conditions. The development of theories for such problems together with answers is of ever increasing importance, especially as the problems in aeronautics are becoming more and more complex. These solutions have the important function not only of high-lighting certain aspects of the flow, but of pin-pointing the important parameters in a problem together with providing better than order of magnitude results. However, theories must be based on physical facts and these can only be determined in the final analysis from experiments. The wind tunnel has three highly significant roles in modern aeronautics: (i) Experimental research as a forerunner to future theoretical research. (ii) Experimental research as a confirmation and extension of theory. (iii) Current research and development work on a given aircraft. The current trend in bringing strong theoretical and experimental groups together, plus the employment of rapid measurement techniques in wind tunnels, promises the greatest possible productive utilisation of these highly important and expensive facilities. In most cases today they are playing a strong, if not the leading, role in aeronautical development.

Lateral—Directional Dynamics

Abstract: This chapter explores the lateral-directional dynamics. It discusses some major aspects of lateral-directional dynamics, and their interpretation, differ significantly from the longitudinal dynamics. It also explores the procedures for interpreting the differences. As in the longitudinal solution, implicit in the response are the dynamic properties determined by the lateral-directional stability characteristics of the aeroplane. The most obvious difference between the solution of the longitudinal equations of motion and the lateral-directional equations of motion is that there is more algebra to deal with. These are the roll subsidence mode, the spiral mode, and the Dutch roll model. The chapter incorporates various examples throughout the text for better illustration of the subject being discussed. It also briefly explains the role of lateral-directional dynamics in flying and handling qualities of an aeroplane. As with longitudinal stability the lateral-directional stability characteristics of the aeroplane are critically important in the determination of its flying and handling qualities and there is no doubt that they must be correct.

Choice of Fin Area and Dihedral

Abstract: THE choice of nv and — lv for a new aircraft is not simply a matter of chance; nor can it be decided entirely by considerations of stability. Below are given certain working rules, which should act as a useful guide.