Rossiprop.

General info:

Rossi is a ground-adjustable air propeller intended for Ultralight and Homebuilt aircraft and other uncertified recreational light machines with internal-combustion engines (airboats, hovercrafts etc).

Semi-scimitar shape. Prop blades are hand-made with high-strength fiberglass-epoxy composite. Each blade (except 58 model) has strong leading edge protection made with a special antistrike composite.  Prop hub is made with aluminum allow, CNC machined and anodized (polished). Bolt pattern is standard used for Rotax engines. Usually the hub has 2 pilot holes. 1” for 503, 582 etc, 47mm for Rotax 912-914. The basic set included blades, hub, blade covers and hardware. Pitch protractor and spinner are options.

The standard is 2-3-4 blade propeller. 5 and 6 blades special order. The standard color is black, white is an option.

There is a serial blade number at each blade root. If you need a replacement, you can provide this number so replacement blade(s) can be balanced to fit exactly to your propeller.

Technical performances:

Max prop RPM 2800 (3300 for some models) rev/min

Warranty against manufacturer’s defects 500hours for 2 year

There are 7 standard Rossi models, both made left and right hand rotation. Special reinforced blades can be ordered for more powerful engines. Technical data for 3-blade standard hub propellers, can be different with different hubs.

Model	R / L 58	R / L  64	R / L83	R / L 84	R / L 86	R/L 87	R 95
Diameter	47”	51”	68.3”	69”	71.3”	71.5”	77.3”
Max blade chord	4.2”	4”	4.65”	4.65”	4.8”	4.8”	5.35”
Appr. engine power HP*	15-40	15-40	30-100	30-100	40-140	40-140	60-200
Appr. moment of inertia	_	_	3900	3900	4700	4700	6000
Appr. weight kg	1.6	1.8	3.8	3.8	3.9	3.9	4.4

*depends on blade quantity and prop RPM

Assembling and installation:

1. Disassemble prop hub.

2. Install propeller blades into their positions between the hub halves (be careful, drilled points inside the halbes must be positioned in front of each other). Install outer bolts with lock nuts and tighten slightly to hold blades in place.

3. Install the prop hub (with spinner base, spacer if necessary) on the engine (gearbox) flange with the six 8mm metric bolts and washers.

4.  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.

5. Set the scale on the protractor to 0 or about the recommended by engine manufacturer pitch. 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

6.  Fit the other 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 the hub.

7. Place the notch on the other end of the protractor against the trailing edge of the prop blade.  Rotate the blade until the leading edge side just touches the protractor scale surface. Ensure that sheet metal ears are both touching the flat face of the hub and there are no gaps between the scale part, blade leading and trailing edge surfaces. Torque the two outer bolts to 3-4 foot lbs. to hold this blade at this setting. Then repeat the procedure for the other blades.

8.  When all blades have been set, torque the lock outer bolts sequentially with 5 ft. lb. increments to 12-14 ft lb. This will help to insure proper tracking. Check the pitch of all blades again, and once satisfied, begin torquing the inner Hub bolts sequentially, opposing and with 5 ft. lb. increments to 15-17ft lb.
WARNING!!! DO NOT OVER OR UNDER TORQUE BOLTS! NEVER START ENGINE WITHOUT PROPER TORQUE ON BOLTS!!!

9. Install the six lock nuts on the ends of the protruding prop bolts and torque to
approximately 13-foot lbs. If your bolts have the drilled heads (if not you could drill them), secure them appropriately with 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! A static check of rpm 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 RPM.  If you cannot reach recommended RPM, you may be Over/Under Pitched. Do not run in this condition or engine damage may result. Install the spinner fairing (if you use spinner) after the static RPM test.

10. 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.

If you have any questions - contact Air Trikes Enterprises. E-mail: info@airtrikes.net Phone number: 450-202-7772  Website www.airtrikes.net or one of our local dealers closest to you.