• Usually most balloons fly between 500 feet and 1000 feet high although they can fly both higher and lower than this. The length of time a hot air balloon can stay up depends on the amount of fuel (liquid propane) it carries. Most balloons will carry enough propane to remain in flight for around two hours, but the length of time that the fuel lasts depends on factors such as the weather, weight and the temperature. Flights in hot air balloons have been recorded at over 50,000 feet. However, the sport of ballooning is most enjoyable when flying 1,200 to 3,000 feet. Or just above the treetops. When balloons fly over populated areas, they maintain an altitude of at least 1,000 feet.
  • 'In 1935, Ed Yost watched Captains Albert Stevens and Orvil Anderson depart from the Stratobowl in South Dakota, on their way to set an altitude record of 72,395 feet. Sixteen-year-old Yost had been interested in aeronautics and aviation for years. Yost, born in Bristow, Iowa in 1919, was graduated from the Boeing School of Aeronautics here in Oakland, California, in 1940. While at Boeing he lived in Tracy and flew from the Tracy Airport, becoming one of United Airlines' "Tracy Aces". Yost was employed by the U.S. Army Air Force from 1943 to 1945, and learned meteorology at the University of Minnesota in 1950. Yost spent a lot of time in Alaska in the forties, first working for Ferguson Airways, based in Kotzebue, a port on the Arctic Ocean within the Arctic Circle. From 1946 to 1948, he worked for Alaska Airlines, based in Anchorage. In 1949 Yost was Senior Engineer and Tracking Pilot at the High Altitude Research Division of General Mills in Minneapolis. In '52 they sent a 3.2 million cubic foot balloon, carrying U.S. Navy instruments into the stratosphere to study cosmic Rays, as part of a scientific project that spanned many years.' Hot Air:

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