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The early history of the autogiro is essentially a history of
one man, a young, Spanish inventor and civil engineer, Don Juan
de la Cierva. Cierva was intrigued by this new technology after
the Wright brothers first demonstrated their flying machine, and
design to build his own airplane. His first attempt at building
an autogiro was the C.1.
Unfortunately, this design never flew because the balance in
lift and torque caused the machine to tilt to one side. However,
when it was tested, in October 1920, it did demonstrate successfully
the principles of autorotation while taxiing on the ground. In
1923, Cierva decided to use hinges in his rotor design by combining
a conventional fixed wing aircraft's engine and fuselage with
an overhead mast and three bladed rotor system, and on January
17, 1923, the C.4 flew, marking the first controlled flight of
an autogiro. In August of 1933, after plenty of modifications,
the C.30 proved to be the most popular production of an autogiro
ever designed with more than 180 of them being built and sold.
Igor Bensen was impressed with the idea of this flying machine
and in 1953 saw the rebirth of interest in the gyroplane with
his patented "Gyrocopter".
Igor Bensen formed his own company and began to work. The first
aircraft to bear his name was his model B-7 introduced in 1955.
It had an airframe made of round aluminum tubing, wooden rotor
blades, a 42 horsepower Nelson, two-stroke engine, mounted in
a pusher position behind the pilot. This two-bladed gyrocopter
used the teetering hub-bar and rotor-head to equalize the lift
from opposing side of the rotor disc. Bensen built several models
of his gyrocopter, and his 1957's model was the basic aircraft
produced by the Bensen Aircraft Company for three decades. Today's
gyrocopters have other refinements and variations of the Bensen
design, but the principle is same and most of them follow the
basic Bensen Gyrocopter principles.
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