Pilot Operating Handbook
H3 EasyFlyer Sport
SECTION 7
SYSTEMS
Dynali_POH_H3 EasyFlyer Sport Rev. 2.5
– Issue date 30.10.2020 Page
54
Four V-belts transfer the movement to the
receiving (driven) pulley which houses
one freewheel
. The
freewheel is oil lubricated
and can bear a torque of 660Nm.
It
drives the rotor while the engine is running and keeps it free of movement when
the engine is stopped or idle (failure or landing).
The tension in the drive belts is provided by the two tensioning rods linked to
the tensioner arm
.
An electric actuator moves the bellcrank of the tensioner arm
for tensioning the belts.
The clutch system of the H3 is commanded from the cockpit. It serves to connect or
disconnect the engine to the transmission system. When disconnected, it allows the
engine to start with the rotor stationary, ensuring the safety of those on the ground
during warm-up. Once ready for takeoff, the rotor is engaged by the pilot using a switch
on the instrument panel.
The V-belts are sloted for better power transmission.
Adequate tensioning is
mandatory.
The adequate tension can be easily checked before the flight with a spring
dynamometer. The belts may not flap, this can cause premature wear of the freewheel.
Correct belt tensioning = 15kg for 1cm deflexion in the middle of the belt.
The transmission shaft transmits the movement forward to the main rotor via the main
transmission gearbox and to the tail rotor via a rubber coupling joint and then to the
rear transmission.
The
long shaft which drives the tail rotor is supported by seven intermediate
bearings
in the tail tube.
