Free Flight autogiro
The autogiros (girocopters)
The first autogiro was built in the year 1923 by the spanish civil
engineer Juan de la Cierva.
The principle of the autorotation already
existed previously in the
nature and we
can see it, for example, in the seeds of
certain trees of garden. These seeds have the stone on an extreme and
a wing in the rest.
To|In the to fall down of the tree, they
start to turn in a vertical axis around its center of masses (the stone) and at the
acquire relative speed with respect to the air the wing creates
sustenance and it balances
weight of the stone. Dragged for the wind or for currents upward the
seed can travel in autorrotation
without any engine at kilometers of distance...
The acrobats of the paraglide know
like making how to enter the hight
aspect ratio paragliders in selfrotation, maneuver called normally "helicopter"
although really it should
"autogiro". The vertical speed of fall of the maneuver him
leave, but in paraglide
the pilot is subdued in a
rotation and a danger of being fold or twist, that can not keep for
much of time.
has been applied with success to autogiros
with engine, that provistos
with a horizontal propulsion can move
with facility with or without wind, being the main rotor turning
completely free in selfrotation and without any transmission of the
engine. It is necessary to clarify that the autogiros whith engine have
a small transmission of force from
the main rotor only in the phase of being started off, for giving
angular speed to the blades until acquires the revolutions per minute
necessary for the takeoff. This transmission (pre-rotator)
is optional and some light aircraft autogiros simple they are prelaunched
giving an initial impulse to the rotor blades with the hands and
the relative wind, or acquired with the career, give the
necessary revolutions for takeoff.
with the helicopters
helicopters to advance towards ahead need to incline the plan of the
main rotor under the horizontal, to create one quite that
promotes towards ahead taking the air
of above to down
with the help of an engine to the main rotor. It would not be possible
to make a helicopter for flight free. However the autogiros fly
normally with the plan of the rotor with an angle above the horizontal
so that the one that sustains the movement of the blades is the air
that hits under the rotor. It is necessary to say that the helicopters
have a security system that in the event of stop of engine disconnects
the main transmission, it invests
the angle of incidence of the blades (without investing the sense of the rotation) and it makes
enter in autorotation allowing a safety landing.
for free flight
Is the observation of the functioning of the light
aircraft autogiros at the beginning of the 90, in particular of the
model Mach-10 of Sallén
the one that led me to be thought that...
because not to eliminate the engine and frame and replace it
for a triangle and a keel of delta wing?. Its known that the advantage
of the light aircraft autogiro it is that in the event of stop of
engine they continue in selfrotation, as a matter of fact, with the
engine at minimum power
him almost as if they did not have propulsion. So the idea about a
autogiro of free flight appears with relative naturalness.
See a primitive idea about 1990 here
Years afterwards I have
contacted the designer Stephan Nitsch,
specialist in the reproduction of the rigid wings of the Otto Lilienthal, which
was experimenting towards 1983 with an autogiro prototype at real scale
as it is
detailed in their web page. On his web page there are a detailed
explanatory pdf document and a video of the experiments carried out.
rotorplane and others
"rotorplane" from Vitaliy.S.Morozov (link lost)
The idea of him is similar to the Autogiro Nitsch,
but with design bishovel nowhere in
trishovel. The advantage
foreseen tea a system prestriker
with rockets on the tips of the wings
(optional system to initiate the rotation into the case that there is
not wind) and it
seems that at the rotor has a mechanism to vary, him to say the
incidence of the shovels. The structure seems ideated to protect the
of the shovels, and these seem high enough like to avoid contacts with
the floor. The system of takeoff, wants and landing him similar to that
of a hang glider. Now, with a autogiro, the great advantage
of the autogiro is not entering in stall, since the wings continue turning with
respect to the wind.
of a prototype of
1984 are seen. In the text
indicated that the performance
of the device him similar to that of a hang glider, but it is necessary
to consider that it is related at the beginning of the 80. And it is
necessary to consider that due to the big resistance that offers the
rotor they can not achieve themselves with facility high glide angles.
Autogiro Fa-330 [ru]
of free flight is theoretically possible but it
still needs to develop.
That one who knows if some day we
will change our paragliders for a
selfturning of free flight!
As a matter of fact, the idea about
the autogiro of free flight him
very ancient, you see the Hafner "Rotachute".
It is a kind of rotatory parachute to jump
of the airplanes. Photo of 1940, slightly retouched by LE: