Accession Number : ADA017552

Title :   Criteria for Controlling Vertical Motion of Stratospheric Balloons.

Descriptive Note : Final rept. 2 Aug 74-31 Aug 75,


Personal Author(s) : Nelson,Jean R.

Report Date : 06 NOV 1975

Pagination or Media Count : 82

Abstract : A successful scientific balloon flight mission is dependent upon accurate control of vertical motion. The scientist wants a rapid ascent to his altitude of interest, but this desire must be tempered by avoiding aerodynamic stress damage to the balloon. Reasonable limits on altitude variation caused by temperature fluctuation are desired, so effective management of ballast is required on zero pressure balloons. There are also special situations with multiple altitude requirements that require efficient management of ballasting and valving for vertical motion control. Empirical equations were developed by the University of Minnesota (under contract to ONR and jointly sponsored by the U.S. Army, Navy and Air Force) before 1960. The night ascent technique frequently used now also poses a new environment regime so it was considered necessary to re-evaluate the vertical motion response using current computer capabilities.

Descriptors :   *Balloons, *Ascent trajectories, Turbulent flow, Laminar flow, Aerodynamic drag, Diurnal variations, Computer programs, Meteorological data

Subject Categories : Lighter-than-air Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE