biplane|265x265pxHarmon was known for his love of automobile racing, yachting, horses, and other pursuits. In 1908 he learned to fly in approximately one week, and was awarded the sixth pilot's license issued in the United States. He was involved with both ballooning and airplanes; in 1908 he set a record for time aloft in the Indianapolis balloon race. In 1909 Harmon participated in several balloon races; he again participated in the June Indianapolis balloon race, with A. Holland Forbes; his balloon was fired upon at night traveling over
Morgan County, Alabama. In September 1909 he was the subject of a large search when he flew solo over western Massachusetts and lost contact with those on the ground; Harmon landed safely and returned to city via car and train. In October 1909 at the St. Louis Centennial balloon race Harmon again set a flight duration record of 48 hours 26 minutes as well as an altitude record of 24,000 feet in his
gas balloon New York. Later in October he was a witness for a
Wilbur Wright flight of 27 minutes (the longest at a government aerodrome at the time). Harmon began 1910 by attending Aviation Week in Los Angeles, California, bringing a
Curtiss aircraft and a balloon; while there he conducted a number of balloon flights with passengers. In March 1910 he attempted a balloon flight from San Antonio, Texas to New York, but was brought down early by weather. In July 1910 he set an American endurance record for airplane flight in Boston, staying aloft 3 hours 3 minutes 30 seconds; the record was broken in September. Later in July Harmon made an attempt to fly across the
Long Island Sound, but crashed when his
Farman III biplane lost power; he was not seriously injured. By August 1910 Harmon had added two French
Bleriot monoplanes to his collection. On August 20, 1910, Harmon became the first man to fly across the Long Island Sound, flying from
Garden City, Long Island, New York to
Greenwich, Connecticut. Harmon attempted to land on the property of his father-in-law E.C. Benedict but could not locate it in the fading light of the day, instead landing nearby. On landing he hit a patch of rough grass which broke the chassis of the airplane. For the flight, Harmon was awarded the
Doubleday-Page Trophy. , 1910 In September 1910 Harmon won the Harvard Cup at the Boston Aviation Meet; he competed in a bomb-throwing target contest and other events as an amateur aviator. He also was involved in another wreck of his Farman biplane but again was not seriously injured. In October 1910 Harmon participated in an aviation demonstration with
Claude Grahame-White in
Washington DC; later in October Harmon also set an unofficial altitude record of 24,200 ft in a balloon. In May 1911 Harmon went to Europe to arrange for American aviators to participate in an
International Aviation Meet at Belmont Park; in July he participated in a balloon race from
Kansas City, Missouri, to qualify for
Gordon Bennett Cup race but was forced from race when his balloon was caught in a severe thunderstorm. In December 1911 he announced retirement from balloon racing and airplanes at the behest of his wife, father-in-law, and various business associates. Harmon returned to flight in November 1913 while spending time in England, participating in a flight from London to Paris with Claude Grahame-White. In April 1915 he, along with several other aviators and wealthy friends, participated in a scheme to commute regularly from New York to points at the eastern end of Long Island by airplane. After moving to Paris in the early 1920s, Harmon became an advocate for various aviation causes. In December 1924 he offered to replace the Gordon Bennett Cup after it had been won by Belgium; the following year he proposed a memorial in Paris to
Lafayette Escadrille aviators; the model for the monument became the
Harmon Trophy for aviation. followed by a promotional tour of Europe financed by the
King of Belgium and using a
Caproni bomber on loan from the Italian Air Force. In May 1927 Harmon was on hand for
Charles Lindbergh's arrival in Paris; Harmon met Lindbergh during post-flight receptions. In June, Harmon installed a plaque commemorating Lindbergh at
Le Bourget airport in Paris. In December 1928 Harmon sent a proposal to the
League of Nations for an international air force that could be used by the League to prevent wars. While the proposal received some support, it was never seriously considered. In September 1930 Harmon made a flight in
Villacoublay, France, commemorating his Long Island Sound crossing; with him on the flight was
Maurice Farman, designer of the biplane Harmon used in the crossing. In 1931 the Clifford B. Harmon Cup was created, to be awarded to amateur golfers. Clifford Harmon continued to personally award the Harmon Trophy until 1938. == Later business ventures ==