  |
|
The stamped number on each Hub half must remain adjacent to each other during re-assembly!
2. Install propeller blades into their positions between the hub halves. Install shoulder bolts with the Nyloc nuts and tighten slightly to hold blades in place.
3. Note the small-machined insert that fits into the hub and / or spacer. On most 2-cycle applications, this insert must be installed into the hub. If you have a spacer, it too will have an insert and must be installed as well. Most 4-cycle applications have no need for the Hub insert, unless you are using a spacer. On Pusher configuration, with propeller assembly flush against the prop flange, make sure that there is at least 4.5” clearance between anything forward of the prop tips. If required, fit the prop spacer on the engine prop flange, followed by the prop hub onto the prop spacer. NOTE: On all applications, if you are using a Spinner, install the backing plate between the spacer and the hub.
4. Secure (finger tight) the prop hub and extension to the prop flange with the six 8mm x 160 mm bolts.
5. With all bolts slightly tightened, you should be able to easily adjust the pitch on the blades. Make sure at this time that the leading edge of all blades are facing in the right direction and are not backwards.
6. Set the reference scale on the protractor to the recommended arbitrary setting and clamp scale in place:
ROTAX: 503, between 2 and 4…582, between 11 and 14, between …912&up, between 12 and top of scale. Due to variations in gearboxes, etc. more adjustments are usually required to dial in the “perfect” pitch setting. Clamp the scale with a side clamp Cleco or small C-clamp
7. Fit the folded sheet metal end of the protractor into the center hole of the prop hub so that the sheet Metal ears are both touching the flat face of hub.
8. Place the notch on the other end of the protractor against the trailing edge of a prop blade. Rotate the blade until the leading edge of the flat side just touches the rounded nose area of the notched section of the protractor. Ensure that the ears on the protractor are flush against the hub when the blade is pitched against the other end. Torque the two shoulder bolts to 3-4 foot lbs. to hold this blade at this setting. Then repeat the procedure for the other blades.
9. When all blades have been set, torque the Nyloc shoulder bolts sequentially with 5 ft. lb. Increments to 14.5 foot-lb. This will help to insure proper tracking. Check the pitch of all blades again, and once satisfied, begin torquing the long Hub bolts sequentially, opposing and with 5 ft-lb. increments to 14.5 ft-lb.
WARNING!!! DO NOT OVER OR UNDER TORQUE BOLTS! NEVER START ENGINE WITHOUT PROPER TORQUE ON BOLTS!!!
10.Install the six jam nuts or castellated nuts on the ends of the protruding prop bolts and torque to approximately 13 foot-lbs. If your bolts have the drilled heads, secure them appropriately with .032 stainless steel wire. If your bolts have the drilled shaft and castle nuts, you can add a thin washer to line up the cotter pin holes, but DO NOT UNDER OR OVERTORQUE! Bolts supplied differ according to engine type. A static check of rpm’s must be performed before flight. Refer to engine manual for specific instructions. NOTE: DO NOT FLY UNTIL YOU HAVE CHECKED AND RECHECKED YOUR PROPELLER FOR PROPER MOUNTING AND PERFORMED A STATIC CHECK OF R.P.M.’s. If you cannot reach recommended RPM, you may be Over/Under Pitched. Do not run in this condition or engine damage may result.
11.Re-check torque of prop bolts after first hour of operation and as routine maintenance. Never over torque or “STRETCH” prop bolts! The standard prop bolt for this propeller is a Grade 8 metric and will fit the Rotax 75mm bolt pattern. AN 5 prop bolts will fit the ROTAX 912 application, use the same torque value. NEVER OVER TORQUE or exceed established recommended usage of prop bolts.