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A preliminary analysis of the response characteristics of spherical balloon wind sensors is presented. It is shown that smooth superpressure spheres do not provide accurate detailed wind profiles and that the response characteristics can be improved by the addition of roughness elements. Experimental data show that surface roughness elements on a spherical balloon stabilize the drag force vector and reduce the lift force. Spurious aerodynamically induced motions are significantly reduced, and the balloon more accurately senses the true wind.

Ae ro-As trodyna mic s Laboratory Distribution of this report is provided in the interest of information exchange. Responsibility for the contents resides in the author or organization that prepared it. NASA -,GEORGE C. MARSHALL SPACE FLIGHT CENTER FOREWORD This report presents further results of a study conducted by Meteorology Research, Inc., Altadena, California a s part of NASA Contract.NAS8-5294 with the

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This paper discusses the role of applied meteorology in the solution of large space vehicle development problems. A general outline of the role of the applied meteorologist is given, followed by a discussion of the data requirements for vehicle design and test evaluation, analytical procedures for data presentation, and areas of influence on space vehicle development. Examples of the influence of atmospheric conditions in the design are presented illustrating the utility of applied meteorology.