- Manhigh I to 29,500 m (96,784 feet), by Captain Joseph W. Kittinger on June 2, 1957
- Manhigh II to 30,900 m (101,516 feet), by Major David G. Simons on August 19–20, 1957 for a 32-hour flight
- Manhigh III to 29,900 m (98,097 feet), by Lieutenant Clifton M. McClure on October 8, 1958
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).
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.
- Project Excelsior, follow-on flights in 1959 and 1960
- Kane, item 1541, p. 47
- Clifton McClure; Rode Balloon to Edge of Space
- Kane, Joseph Nathan (1997), Famous First Facts: A Record of First Happenings, Discoveries, and Inventions in American History (Fifth Edition), The H.W. Wilson Company, ISBN 0-8242-0930-3
- Kennedy, Gregory P. (2007). Touching Space: The Story of Project Manhigh. Atglen, Pennsylvania: Schiffer Books. ISBN 978-0-7643-2788-9.
- Ryan, Craig (1995). The Pre-Astronauts: Manned Ballooning on the Threshold of Space. Naval Institute Press. ISBN 1-55750-732-5.
- Simons, David G.; Schanche, Don A. (1960). Manhigh. Avon Books.