After years of wondering why he didn't look like his younger sister or brother, a young man finally got up the nerve to ask his mother if he was adopted.
"Yes, you were son," his mother said as she started to cry softly. "But it didn't work out and they brought you back."
HelicopterIn 1922, Henry A. Berliner demonstrated the first helicopter prototype for representatives of the U.S. Bureau of Aeronautics in College Park, Maryland. Berliner made this first ever controlled horizontal helicopter flight in a war-surplus Nieuport 23 fighter with tilting tail rotor, and a short-span upper wing with 14-ft helicopter blades at the tips. It was powered with a Bentley 220 hp engine to the front which turned the two counter-rotating lifting rotors through a series of geared shafts. The two rotors could tilt slightly in opposite directions to control yaw. Two sets of five 36-in x 8-in louvers, located below each rotor, opened and closed differentially to provide roll control by presenting a flat surface, which reacted against the rotor downwash. |
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