Project Manhigh III (High Altitude Balloon Flight), Etc.: "Aerospace Power for Peace" 1959 US Air Force (Patreon)

more at http://quickfound.net/

USAF Special Film Project SFP-658

Silent (soundtrack lost).

Originally a public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.

The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).

https://en.wikipedia.org/wiki/Project_Manhigh

Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/

Project Manhigh was a pre-Space Age military project that took men in balloons to the middle layers of the stratosphere, funded as an aero-medical research program, though seen by its designers as a stepping stone to space. It was conducted by the United States Air Force between 1955 and 1958...

History

The project started in December 1955 to study the effects of cosmic rays on humans. Three balloon flights to the stratosphere were made during the program:

Manhigh I to 29,500 m (96,784 feet), by Captain Joseph W. Kittinger on June 2, 1957. The balloon was launched from South St. Paul Airport and the flight was cut short due to one of the capsule's valves being installed backwards which vented the oxygen supply outside, but not before reaching a record altitude of 96,784 feet.

Manhigh II to 30,942 m (101,516 feet), by Major David G. Simons on August 19–20, 1957, launched from Portsmouth Mine in Crosby, Minnesota, for a 32-hour flight that included a set of 25 experiments and observations, and earned Simons a Life magazine cover spot. With the pilot and the scientific payload, the Manhigh II gondola had a total mass of 748 kg (1,649 lb). At maximum altitude, the balloon expanded to a diameter of 60 m (200 ft) with a volume of over 85,000 m3 (111,000 cu yd).

Manhigh III to 29,900 m (98,097 feet), by Lieutenant Clifton M. McClure on October 8, 1958

Candidates for the Manhigh project were put through a series of physical and psychological tests that became the standard for qualifying astronauts for the Project Mercury, America's first manned space program.

A similar project in which a man in a gondola reached an altitude of 15,785 m (51,788 ft) was performed in 1931 by the Swiss physicist Auguste Piccard...

Manhigh III at "This Day in Aviation" 

https://www.thisdayinaviation.com/tag/manhigh-iii/

USAF 246 page pdf on Manhigh III: https://apps.dtic.mil/dtic/tr/fulltext/u2/259635.pdf