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During May, 1810, in a field near their home at Baldwin, Albert, age 21, made the first brief hop, then Arthur, 23, the second. This plane gave them a start toward teaching themselves to fly that summer, doing brief, short straightaway hops, in spite of continual engine trouble. 
This plane was promptly followed by a more successful design using the same engine, which was so troublesome their progress was seriously hampered. Finally, their father decided that if they were determined to learn to fly they must have an actual airplane engine, so he bought them a new French-built 3-cylinder, 35-horsepower "Y"-type Anzani engine. For this engine they built a new 2-seat tandem monoplane with which they carried on their experiments through 1911 and 1912. 
This third plane proved to be an excellent machine and both brothers were soon flying very well and proposed to start a flying school. In May, 1912, they leased 20 acres of ground near their home for a flying field and advertised their planes in the aviation magazines of that time. They were able to carry a passenger with this plane and took their sister, Violet, for a ride. She thus became one of the first female passengers in the United States. Having helped the brothers by sewing the wing coverings she was also on of the first American women in the aircraft industry. During 1912 they built a new light, single-seat monoplane known as the "Model D," also using the Anzani engine. This plane was intended for training work using the early grass cutting method. 
On January 9, 1913, Albert flew over Baldwin, Long Island, and dropped a package of mail at the local Post Office advertising "Heinrich Aeroplanes, Monoplanes, or Biplanes, Flying taught and Exhibitions Arranged." In April the brothers were flying the two 1912 monoplanes, shifting their one Anzani engine from one machine to the other as needed. That spring a second person was carried in the smaller single-seat monoplane, the passenger kneeling on the

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