Vittorazi Motors COSMOS 300 User Manual page 15

Propeller screws tightening values:
•
Carbon-fibre propeller: 12-14 Nm on each screw M8.
Ask an authorized dealer or the instructor if you are not sure about the propeller assembling.
It is very important to check the tightening of the propeller screws before take-off and
after landing.
Be sure that the screws are suitable to the propeller in use: the thread of the screws is
inserted in the hub, for at least 12 mms for carbon propellers.
The use of a propeller not approved from Vittorazi can give rise to serious anomalies and
immediately voids the warranty (see also the warranty chapters).
For Vittorazi the propeller is an integral part of the engine and should not be considered an
extra part of the engine. The company has decided to invest in research and study of high-
tech solutions, to have an ideal combination engine-propeller in many flight conditions. All
approved propellers are designed in collaboration with Vittorazi engineers, with the aim of
giving maximum performance and safety. Let's see some features guaranteed in the
approved propellers:
•
The adequate operation in optimal RPM-Range of engine and propellers.
•
The best thrust during take-off and critical flight conditions, optimizing the energy
transfer in a disturbed airflow.
• The best fuel consumption in all flight conditions, thanks to the most efficient profile
and angle of attack.
•
The optimization of the dynamic torque effects and static torque effect, through a
lightweight structure and designing low resistance profiles.
•
Avoiding resonant frequencies through optimized carbon fibre structure of the
propeller and avoiding annoying vibrations along the entire RPM range.
•
The correct balancing of the propeller by static and dynamical procedure, combined
with a safe and precise mounting by CNC machined holes.
•
The reduction of noise thanks to the best profiles and the tip speed below 0,65 Mach.
Cosmos 300 – User manual – V3 15