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Effect of the opto-sensor
Position mode works entirely without a visible horizon; that is why it also
operates properly close to trees etc. If you are a beginner to helicopters it is
best to restrict your flying to normal ground surfaces (grass, gravel etc.) This
should ensure that maximum stabilising effect is always available.
In darkness, or when overflying
optically smooth surfaces
(water, snow, car roofs, smooth unpatterned indoor floors etc.)
In such cases, i.e. when the optical ground sensor cannot detect sufficient con-
trast, only horizontal mode will be active even when the unit is set to "green"
(position) mode. Brief contrast interruptions are bridged by the intelligent
software, and will not be noticed by the pilot. However, if the contrast remains
too low for a long period, the remaining instruments automatically take the
stabilising role; if this should happen, you will need to keep an eye on the
helicopter's position and, if necessary, correct it with slight stick deflections.
If you have to fly under the conditions stated above, for safety's sake you
should select "yellow" horizontal mode beforehand. If you are unsure, check the
contrast as described below.
Indoor flying
Use "yellow" mode. "Green" mode is taboo unless you check the floor
contrast from different distances (see below) and limit yourself to normal flight
attitude (in "green" position mode don't fly inverted indoors - even with the
HeliCommand 3D !).
Checking the contrast
In the "green" position mode the LED will flicker to warn you that the contrast or
brightness is not sufficient; this means that the HeliCommand has automatically
switched to "yellow" horizontal mode. You can check this close to the ground
and at various distances above ground.
Also, the sensor's response can be watched, by setting "green" position mode
and moving your hand under the HeliCommand at a distance of about 30 cm.
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