Aircraft Operating Instructions (AOI)
Type:
CT
Series:
CTLS
LSA
Page: 7-5
AU 010 11000
Revision No. 4
Date: 29 Apr 2008
7.2.2. Propeller
The CTLS may be equipped with various propellers. The operating handbook and the
maintenance manual of the relevant propeller published by the propeller
manufacturer are delivered with the aircraft and must be studied in detail. The
following propellers are certified for the CTLS:
Neuform
CR3-65-47-101.6 3 blade, composite
propeller, adjustable
Neuform
CR3-V-R2H, 1.70m diameter, 3 blade,
hydraulically activated variable pitch,
composite propeller
Kaspar- Brändel
KA1, 1.60m diameter, 3 blade variable
pitch, composite propeller
Warning:
Depending on national regulations, in some countries (like USA) usage
of variable pitch propellers is not allowed for LSA aircraft.
The adjustable propeller from Neuform is factory-set to prevent over-revving the
engine during take-off, climb and level flight. Full throttle static engine speed on the
ground will be roughly 4900 rpm. Engine speed of approx. 4800 - 4900 rpm is
achieved during climb, whereas almost 5500 rpm are reached during level flight with
full throttle, corresponding to maximum continuous engine speed. This pre-setting
makes the monitoring of the correct propeller speed in flight very simple for the pilot.
Both variable-pitch propellers are controlled via a hydraulic adjustment mechanism.
The lever is located in the central instrument panel, behind the power quadrant. The
lever has several indexed positions. To set the propeller, the notch under the lever is
released, the lever moved to the desired position and the notch locked in place. Via a
hydraulic cylinder in the lever and the corresponding line, a hydraulic actuator in the
engine compartment is activated. The actuator is located on the rear side of the
gearbox, above the crankshaft. The propeller is adjusted via a control rod which runs
through the hollow propeller shaft.
The variable-pitch propellers are factory-set so that engine speed at lowest pitch
during take-off and initial climb does not exceed the maximum short-term permissible
speed of 5800 rpm. The climb speeds given in the normal procedures section must
be observed exactly. Should they be exceeded, there is a risk of the engine over-
revving and being damaged.
Warning:
If a variable-pitch propeller is not operated properly, the engine may
over-rev. Propeller speed will increase constantly with increasing
airspeed. For this reason, the variable-pitch propeller must already be
adjusted to a higher pitch during climb. It is the responsibility of the pilot
to ensure that engine operating limits are adhered to.