09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
11-26
ROTAX 912 ULS - PROPELLER INSTALLATION
(FINAL INSTALL OF ENGINE)
•
The Engine, Prop Extension, and Spinner Backing Plate must be installed
before installing the Propeller.
1.
Refer to the parts pages and select the required components for assembly.
2.
Install the Flange Bushings into the prop flange on the engine from the aft side. A
“C” clamp may be required to completely seat the Bushings into the flange. Place
a small wood block between the pad of the clamp and the Flange Bushing to
protect them from being damaged. Use a piece of tubing approximately 1" long
over the Flange Bushings to allow them to seat as the “C” clamp is tightened.
3.
Inspect the Prop for any nicks, crack or dings.
4.
Assemble and mount the propeller as per PARTS MANUAL DRAWING and
Manufacturer's instructions using the bolts provided. Set pitch of prop, using
measuring tools provided with the prop to the following for a starting point.
Adjustment may be required after Static RPM is checked.
•
Whirl Wind = 20.5º per manufacturer's instructions
5.
Note the length of the bolts is critical. Use washers to be certain the bolts are not
bottomed out on the threads.
DANGER:
If bolts are bottomed out on the threads, the prop is not
properly torque, separation from the aircraft during operation may occur.
6.
Use a star pattern and torque the bolt per Manufacturer's instructions. Re-torque
bolts after 5 hours of flight and thereafter according to Manufacturer's
instructions.
7.
Check prop for tracking by turning blade into a vertical position and placing an
object at the tip. A plastic 5 gallon bucket or similar will work well. Rotate the prop
to the next blade and check position. If the position is the same, the prop is in
track. If not, loosen prop bolts and re-torque until proper tracking is achieved.
HINT:
Start torque pattern on the blade that is out of track. See
FIGURE 11L-07/912
.
DANGER:
Track prop with ignition
OFF
!!
8.
Secure Spinner Dome to the Spinner Backing Plate. Refer to
SPINNER
ASSEMBLY
.
9.
Before first test flight, lock brakes, chock wheels and tie the tail to prevent
unintentional aircraft run-away when checking Static RPM. Static (full throttle)
RPM should be between 5100 - 5350 RPM.