the first tethered flight in October 1955. The envelope was plastic film used in gas balloons and heat from plumber’s pots burning kerosene. Yost remained aloft for 25 minutes and traveled three miles from the takeoff point. On October 22, 1960, Yost made the first-ever free flight of a modern hot-air balloon from Bruning, Nebraska. His balloon flew untethered for 1 hour and 35 minutes with the aid of heat generated by a propane burner. The balloon's -diameter envelope was sewn from heat-resistant fabric especially selected by Yost for the purpose. In November 1960, Yost made a second flight with an improved balloon from the famed Stratobowl, near Rapid City, South Dakota. Raven Industries sold their first civilian hot air balloon in November 1961, launching a new sport in the process. The Raven Vulcoon balloon, model S50A, with a basket constructed of aluminum tubing and fiberglass panels was the first hot air balloon to receive an airworthiness certificate from the Federal Aviation Administration. Registration number N1960R was manufactured in May 1972 and first flown on June 11 of that year. Its balloon envelope had a capacity of 56,500 cubic feet, an empty weight of 325 pounds, and a maximum gross lifting capacity of 1400 pounds. For its entire career, the balloon was owned and operated by the Tewksbury Balloon Club, Fairmont, New Jersey. On April 13, 1963, after further refining and improving on his designs and materials, Yost piloted the first modern hot air balloon across the English Channel with fellow balloonist Don Piccard in a balloon later named the “Channel Champ.” In 1976, Yost set 13 aviation world records for distance traveled and amount of time aloft in his attempt to cross the Atlantic Ocean —solo— by balloon. He designed and built his balloon, the “Silver Fox," himself, partly in his home garage. It featured a gondola that was shaped like a boat in the event that he would be forced down at sea — which is precisely what occurred. Although he had traveled far in excess of the distance needed to reach Europe from his launch point off the coast of Maine, his flight path began to point south rather than the hoped-for east direction due to inaccurate weather forecasting. The dream was achieved two years later with Yost’s assistance in a Yost-built balloon, Double Eagle II. Yost also contributed to the advancement of the sport of ballooning