Rotax 912 ULS 3 - 18 Propeller Drive; Technical Data

Effectivity: 912 Series
Edition 1 / Rev. 1
d04641
page 121
May 01/2009
BRP-Powertrain
INSTALLATION MANUAL
18) Propeller drive
The propeller in tractor or pusher arrangement has to be fitted on the propeller flange
in accordance to current certification. As required utilize one of the three possible pitch
circle diameters (P.C.D.) on the flange.
Certification of the propeller sizing and arrangement to the latest requirement such as
FAR or EASA has to be conducted by the aircraft manufacturer.
▲ WARNING: Never run the engine without a propeller installed as engine would
suffer severe damage by overspeeding.
Never fit propeller directly on crankshaft.
18.1) Technical data
See Fig. 80.
- direction of rotation
of the prop flange: counter clockwise, looking towards face of
flange
- attachment of propeller on prop shaft flange:
P.C.D 75 mm (2,95"): 6 bolt holes of 8 mm (.32 in.) dia
P.C.D 80 mm (3,15"): 6 bolt holes of 11,5 mm (.45 in.) dia
P.C.D 101,6 mm (4"): 6 bolt holes of 13 mm (.51 in.) dia.
hub diameter: 47 mm (1.85 in.)
- ratio of gear reduction: 2,2727 (50
Teeth/22 T)
2,4286 (51 T/21 T)
- max. torque:
ROTAX 912 UL, A, F for i=2,2727: 238 Nm (176 ft.lb.) (at propeller)
ROTAX 912 UL, A, F for i=2,4286: 255 Nm (188 ft.lb.) (at propeller)
ROTAX 912 ULS, S for i=2,4286: 315 Nm (232 ft.lb.) (at propeller)
- max. moment of inertia :
- normal between 1500 kgcm
2
(3.559 lb.ft.
2
) and 6000 kgcm
2
(14.238
lb.ft.
2
)
- max. moment of inertia on propeller: 6000 kgcm
2
(14.238 lb.ft.
2
)
- max. permitted static
out-of-balance on a prop: max. 0,5 gm (.043 lb.in.)
- max. extension of the propeller shaft: 120 mm (4.72 in.)
■ CAUTION: No modification of propeller shaft permitted.