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We want to present here how the simulation engine of HELI-X works. As mentioned before, we put much work to
simulate the actual behavior as realistic as possible. The videos on this page are
produced by Thomas Böseler. Thank you, Thomas.
Thrust of the Tail Rotor
In this video you can see the influence of the tail rotor to the overall flight behavior. The primary
task of the tail rotor is to compensate the torque which
is produced by the main rotor. However, the thrust of the tail rotor produces also a
force sidewards. Thus, if you want to hover above a fixed place, the heli has to be oriented oblique. Therfore, it is very
difficult to perform pirouettes slowly. It is just not enough - in reality and with HELI-X - to put the
yaw stick sidewards.
Download (ca. 3 MB)
Gyro and the Tail Rotor
The interplay between the gyro, the tail rotor and the appropriate servo is of crucial importance
for the flight performance of the heli.
This video gives a demonstration, how an r/c helicopter performs with a gyro system which is not optimal adjusted.
During pitch manoeuvers there is created a short torque impulse by the main rotor, which can not fully compensated by
the tail rotor. Thus, the helicopter turns a little bit around the main axis.
The same is true during flips.
You can see that in the foreward flights that the pirouettes are not performed with a constant speed. The helicopter has a
tendency to orient itself like a flag in the wind.
Download (ca. 6 MB)
Autorotation
As in reality, during an autorotion many effects become important.
In order to increase or hold the rotation speed of the main rotor, you have to be very
careful with the pitch. Too few pitch and there is not enough torque to compensate for the drag, if you give
too much pitch, the drag increase so that the rotor speed decreases dramatically.
The same is true when you want to pull the helicopter upwards before the landing. Too few pitch and the heli will crash, too
much, and the rotor speed is reduced so much that a stall might happen.
Download (ca. 6 MB)
Wind
Wind flows not only horizontally but - in particular when the wind is choppy - has also
vertical flow components. This makes it difficult not only to hover above a fixed place but also
to hold the helicopter at a given height.
In reality and with HELI-X.
Download (ca. 4 MB)
Perfect control
When the helicopter is partly in contact with the ground or with an obstacle,
you can see the perfectness of the pilot and also the perfectness of the simulator.
Here we have a multiphysics problem, the combination of aerodynamics and structural mechanis.
In a real time application!
Download (ca. 2 MB)
Some videos:
Here you find a 3D-flight of Thomas Böseler.
It demonstrates how feasible and realisitc HELI-X is. At the end, of course, an
autorotation landing. Thank you, Thomas!
Click on the picture to
download the video (approx. 28 MB) |
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Thomas Böseler has recorded a demo flight
with a scale helicopter. Our Lama flies like a scale helicopter and Thomas did his job very well.
At the end: an autorotation landing. Thank you, Thomas.
Download the video with a click on the picture (approx. 14 MB).
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This video shows how the contact with the ground has been realized.
Click on the picture to
download the video (approx. 3 MB) |
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