Calidus
Variable Pitch Propeller - IVO
AutoGyro_POH_Calidus Revision 4.0 – Issue Date 17.JAN.2019 9-1 - 5
*) To preserve the rubber stops motor drives in opposite direction for a short time when end
positions are reached (back drive). The system knows the end positions already when
starting the gyroplane (beginning with software version 1.1. Current version is v1.5,
incorporating soft-start software).
**) Indication can only be reset by switching the master switch temporarily to OFF and then
back ON. In order to avoid pilot distraction, indication of a possible defect is re-triggered
after another activation of the rocker switch.
Activation of the rocker switch closes an electrical circuit which energizes the electrical pitch
control motor inside the propeller hub through brushes running on a slip (collector) ring. The
electrical motor drives a mechanical gear which is connected to torsion tubes running inside
the propeller blades. The blade pitch change motion is achieved by twisting the complete
blade.
CONTROL
No constant speed controller is fitted in this application and the pilot must select the
appropriate power setting/manifold absolute pressure for the chosen propeller pitch.
PITCH LIMITS
The propeller has two internal pitch limit stops, mechanically limiting the pitch angle at the
pre-determined FINE and COARSE limits. These are different for 912ULS and 914UL
engine applications.
However, it is the pilot’s responsibility to monitor engine rpm in the cruise and
descent to ensure rpms are kept within operational limits!
Note that the propeller requires up to 10secs to transit from full fine to full coarse pitch
CIRCUIT PROTECTION
The propeller runs via an independent 25A fuse. Further, the propeller is controlled via a
control unit that limits (under software rev1.5) the current drawn by the motor, and
incorporates soft-start technology.
COPING WITH MALFUNCTIONS
Coping with control malfunction
Care must be taken to set an appropriate rpm for the flight conditions, and if at fine pitch, do
not descend at more than 80mph to prevent engine overspeed.
Coping with a propeller pitch fluctuation malfunction
If a malfunction causes the propeller pitch to fluctuate, remove the 25A fuse from the
instrument panel. This will cease power supply to the propeller, causing it to stop in
whatever position the supply stopped. Continue safe flight, ensuring there is no engine
overspeed, and land when safe to do so. Investigate and rectify.
Coping with propeller malfunction.
A propeller may malfunction giving the following scenarios:
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