Details of the balloon and launch operations
Launch site: Holloman Air Force Base, Alamogordo, New Mexico, US
Launch team: Holloman
Balloon: Open balloon (zero pressure) General Mills - 2.000.000 cuft (2.0 Mils. Tailored Tapeless)
Serial number: -
Flight identification number: -
Payload weight: -
Gondola weight: -
Overall weight: 2625 lbs
Description of the payload or experiment
EXCELSIOR II (Kittinger)
Responsable institution: U.S. Air Force Aero Medical Laboratory
Principal Investigator: Dr. John Paul Stapp
This was an U.S. Air Force program, which was designed to test whether pilots could survive high-altitude
Tests conducted by the Aeronautical Research Laboratory at Wright Air Development Center demonstrated that a falling body could reach the rate of 465 revolutions per minute about the vertical axis of the body while it was in the prone position. If a pilot bailed out at high altitude, he had little choice other than to fall. Therefore, equipment was needed to stabilize the jumper during the fall. In addition, this equipment needed to be tested to ensure that practicality agreed with theory.
Initially anthropomorphic dummies falling from planes and balloons were drafted as test subjects obtaining important data under the HIGH DIVE program.
Early psychological evaluations showed that pilots who bailed out had a tendency to try to remain with the last link of their aircraft: the seat. Thus man-seat separation devices were developed which 'threw' the pilot out of the ejection seat. Therefore, the next step was to stabilize the pilot with a drogue parachute.
Francis F. Beaupre developed a stabilization parachute which, in theory, would work . After bailout, the pilot would pull the 'orange apple,' which started the parachute deployment sequence. The first to deploy, after a few seconds delay, was an 18 inch pilot parachute. This, in turn, pulled out a 6 foot stabilization parachute, followed by three-quarters of the main parachute. When the person passed through a predetermined altitude, which in the early 1960s was determined to be 14,000 feet, the aneroid barometer would start the release sequence allowing the 28 foot diameter main parachute to fully deploy.
The Beaupre stabilization parachute worked at altitudes where jet aircraft were normally flying.
It then became necessary to see if the system would work at higher altitudes where the newly introduced X-15 and other research aircraft and space capsules would fly. Accordingly, the Aeromedical Research Laboratory at Holloman AFB began a series of parachute test using balloons, under the project's name EXCELSIOR.
The three jumps were made by then Captain Joseph W. Kittinger Jr., from an open gondola hanging from a stratospheric balloon so he wore a full pressure suit.
Performance in flight and data obtained
This was the second jump of the program. Changes in the gondola were made after data from the incident in the first test was analyzed. The water bottles wich entangled with part of Kittinger's personal instrumentation were relocated and there were procedural changes in the activation of the timer to prevent another accidental start.
On 11 December 1959, at 6:30 a.m., Kittinger lifted off on the Excelsior II mission and bailed out from the open gondola at 74,700 feet.
Everything worked perfectly during this mission and he spent twelve minutes, thirty-two seconds in the descent from altitude. The data obtained was used to plan the third and final jump from above 100.000 feet.
After the flight Kittinger received the Harmon International Trophy.
External references and bibliographical sources