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Post Info TOPIC: Cyril Mercier "Helican"


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Date: Feb 27, 2013
Cyril Mercier "Helican"

Found by Hesham, info clarified by Tophe:

This was a light plane designed in 1936 by Cyril Mercier. It is technically not an autogyro, but could be considered a rotorcraft because the vertical canard foreplane uses the same principle as autogyro rotor blades.


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Date: May 25, 2020

From TU 265;


In 1936, Germain Mercier, engineer of Arts et Métiers, formerly of Lioré and Olivier and Couzinet, working
so at a motorist, tried to marry
the qualities of aircraft and autogyro
in a concept called Helican. He had
thought that to keep the qualities
aerodynamics of the plane we had to use
the propeller operating in autorotation, not
as a lifting element, but as the organ of stability and maneuverability, leaving the fixed wing with great finesse. A wing in loss of
speed is not dangerous in itself; it becomes so when stability is compromised by the sudden decline in the center of pressure. Control by "self-steering" constituted for
Mr. Mercier a fixed point that is missing from
the plane. Mr. Mercier's device project
included a lowered wing, a
rear-mounted powertrain
in the propulsive position, the fuselage was
extended forward to support a
vertical axis propeller which replaced the
classic empennages, like
govemes of a duck. This propeller, which rotates in autorotation, had very reduced dimensions: for an aircraft of
10 meters wide, it was about
two meters in diameter. This
"self-steering" provided maneuverability in all directions as well
than high lift. Its hub, mounted on a gimbal or ball joint on the fuselage frame, could be oriented in all
sense by the pilot by means of a handle
with ordinary broom. Traction on the handle increased the incidence of the propeller, creating a nose-up torque. Conversely, we
was biting the device. A tilt at
right of the handle produced the same displacement of the propeller giving birth
to two simultaneous couples: a couple of
gyration that rotates horizontally
the plane and a couple of rolls that tilt it
as the fins do. And vice versa
for the left handle. The presence of
this roll torque even allowed the
Removed ailerons and reduced the
piloting the maneuver from the single run to
broom. The activation of the high lift device, such as lower flaps or bending fins, was combined
with a positive deflection of the front propeller,
which also reinforced the high lift effect. At the time of landing, the Helican first landed on its two
rear wheels, slightly arranged
behind the center of gravity; then he
fell on its front wheel, tilting
braked by the lift of the horizontal propeller.

On these principles, Mr. Mercier studied
a small passenger plane prototype
two-seater sedan. It was
a low wing monoplane, spar and
ribs in spruce, coating in
plywood. The fuselage and the cabin
was made of wood. The engine mount was in tubes
welded and the horizontal wooden propeller.
The aircraft was equipped with curvature flaps over the entire width of the airfoil, since there were no fins. The vertical stabilizers were carried by two beams which surrounded the propeller. The engine selected was a Salmon or a Train of 40/50 hp. This project was not carried out.

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