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The
ability to change the pitch in flight is as significant for the airplane pilot
as for the driver of a car to shift gears in the transmission.
This
results in substantial savings in fuel, engine wear and noise.
Pilot
controls the pitch through the toggle switch mounted in the cockpit. Pressing
the toggle switch one way sends electric current through the graphite brushes to
the slip rings and finally to the electric motor.
Depressing
the toggle switch the other way-reverses the polarity of the current and the
rotation of the electric motor. The pitch change operation is similar to the
power windows in an automobile. As long as you hold the switch in one direction
the pitch changes in that direction and you observe the result on your RPM
meter. Torque from the electric motor is multiplied in a planetary gear drive
which turns the lead screw.
Lead
screw is supported by a thrust bearing and converts it's rotary motion into
axial movement of the spool. The spool is linked to the supercams which turn the
torsional rods. Torsional rods transmit the movement from the center of the prop
to the outside section of the blade. This causes the blade to twist therefore
changing the pitch in the same manner as the ground adjustable system.
Movement
of the spool can be restricted each way by inserting washers on the lead screw.
This limits maximum and minimum pitch and prevents engine over-revving.
Mounts
directly to any Rotax gear box, "B", "C" models or Lycoming
Can be adapted to other engines. Ground adjustable prop can be converted to the
In flight Adjustable system by means of a retrofit kit. In-flight adjustable hub
comes assembled with instructions on how to use it.
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