Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Balloon Development and University of Chicago Nuclear Emulsion Flight Programs

Corporate Author: Winzen Research Inc
Corporate Report Number: Rept. no. 1269-R
Date of Publication: 1962-08-31
Pages: 128
Contract: Nonr-146011
AD Number: AD0284869
Original AD Number: AD-284 869

Abstract:
The development is described of a balloon capable of carrying a 1500 pound scientific payload to an altitude of 120,000 feet for a minimum duration of 24 hours. Flights utilizing the balloon for carrying the University of Chicago's nuclear emulsion payload are summarized. The resultant balloon design was a natural shaped balloon with a volume of ten million cubic feet featuring a cap, essentially double wall construction, extending down from the apex for a distance of 200 feet. The balloon shell and cap were initially constructed from 1 mil and 1.5 mil polyethylene, respectively, and reinforced with 500 pound fortican load bands. The design was later modified by reducing the cap material to 1 mil and the length of the cap to 120 feet. The test program consisted of conducting a static ground inflation test to establish the maximum permissible inflation and one test flight with a simulated scientific payload. Balloon performance appeared to be satisfactory.

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