1. Disable engine starter/magneto to prevent inadvertent engine startup. Remove existing propeller and clean dirt and oil residue from engine flange. Refer to Figure 1, Figure 2 and Figure 3 for views of the hub halves and blade.

    2. Place the mounting hub half, as shown in Figure 1, on the engine or reduction unit mounting flange. Check for proper bushing and pilot stub fit into the hub half. The hub should sit flush on the mounting flange. Install the flat head allen screws into the 6 mounting holes. Use anti-seize compound on screw threads. Torque the 6 screws using a star pattern. See Table 1 or blade decals for mounting bolt torques.

    3. Each blade has a round side and a flat side. Insert one blade at a time into the hub mounting half with the round side of the blade facing towards the front of the boat. Align the appropriate pitch mark 1, 2, or 3 as indicated in Table 3, with the face of the mounting hub half. It has been found that inserting the pitch mark side of the blade first, then rotating the opposite side into the hub will help to prevent the blades from changing pitch as they are forced in to the hub barrels. Using a rubber mallet, pound the blade shanks into the barrels of the mounting hub half. Watch the pitch marks for rotation away from your desired pitch. If any blade rotates too far away from the desired pitch mark, remove the blade and start the process again.

    4. Place cover half of hub over blades. Insert hex head bolts with washers through the cover half and mounting half holes. Properly seat the cover half by pounding with the rubber mallet, rotating around to each barrel. Once the hub halves are even on all sides, place the washer and nut on the back side of the engine mounting half. Hand tighten the nuts. Using a torque wrench and rotating from bolt to bolt, tighten the bolts evenly to the proper torque given in Table 2. This may take several passes around the bolts. (NOTE: for compact two blade hubs only, a flat screwdriver is jammed between hub and nut to prevent nut rotation during torquing.) Again, watch the pitch marks for rotation away from your desired pitch. Once properly torqued, a small gap will remain between hub halves. Check the propeller blades for track. The blades should track within 1/8" of each other at the tip, and within 1/16" to the same pitch mark.

    5. Run your propeller for approximately 5 minutes at 50% of the desired RPM. Check the cover half bolts to see if they have lost torque. Always check in a tightening direction. If they have, it is because the blades have firmly seated themselves. Tighten again to the proper torque. Note: This torque value should be checked after the first 5 hours of operation and every 25 hours thereafter.

    6. Run up the propeller to determine if the pitch is set to achieve your maximum desired RPM. Remember, if running the engine on a trailer or other static set-up, the propeller will increase by approximately 100 rpm when moving on the water. If your RPM’s are too high or too low, adjust the pitch accordingly. Move the blade towards a higher number to achieve a higher pitch setting, or towards a lower number to achieve a lower pitch setting. See Table 3.

    1. Once you have achieved the desired RPM’s and are satisfied with the performance of your boat, remove one hex head nut at a time and replace with one of the lock nuts provided. Repeat this procedure for all nuts. Torque each of these nuts to the proper torque.

    2. Permanently seal the hub and blade shanks using some silicone caulking or similar product to prevent moisture from infiltrating the blade shanks.

    If repitching is needed, loosen the nuts and partially back the bolts out. Being careful not to scratch the hub, use a pry bar or wedge to evenly pry off the hub cover half. The blades are loosened by grabbing the tip by hand and aggressively rocking the blades back and forth to loosen the shanks. Be careful to not drop the hub or blades.

    Sensenich composite propellers should be fairly maintenance free besides an occasional torque check and cleaning of the hub and blades. The following will help you to operate your propeller safely, keep it looking good and help it to last longer.

    • Do not spin your propeller above the maximum RPM given in Table 3.
    • Before each airboating excursion, carefully examine the propeller blades and hub for any signs of damage, excessive wear or any other condition that would make the propeller unsafe to operate.
    • Never run up your propeller with someone standing in the plane of the propeller.
    • Check hub clamping bolts every 25 hours of operation. Always check in a tightening direction.
    • Keep your propeller clean. Soapy water will remove most residue, but 409 or similar cleaner can be used to remove stubborn residue.
    • Apply a good quality automotive paste wax to the blades. Avoid liquid waxes.

    We hope you enjoy your new composite propeller. We have worked hard to ensure that your propeller will meet or exceed your expectations for years to come.

    We offer a one year warranty on materials and workmanship.

    In the event a unit does not conform to this express warranty, Sensenich Wood Propeller Company will repair or replace the defective material at it’s place of business at Plant City , FL USA. Sensenich Wood Propeller Company will decide which remedy, repair, or replacement it will provide. Any replacement of a unit or a part of a unit during the warranty period will not extend the warranty beyond the original duration. The remedy of repair or replacement is exclusive and does not include the cost of shipping, removal, or installation, all of which are the customer's responsibility.

    Units or parts that are defective must be shipped prepaid to Sensenich Wood Propeller Company at the address listed on page 1. The unit must be accompanied by a copy of the original (Distributor or Dealer) invoice, a Return Authorization Number (which can be obtained by phoning Sensenich Wood Propeller Company), and a brief description of the defect.

    This limited warranty applies to units that have been used and maintained properly. It does not cover units that show abuse, alterations, improper installation, or improper packaging for shipment; and it does not pertain to damage due to object strike or excessive blade wear due to operation.
    This limited warranty is the only express warranty provided with respect to covered units, and all implied warranties, including the IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO THE PERIOD OF THE EXPRESS WARRANTY GIVEN HEREIN.
    Repair or replacement of a nonconforming unit or part is the exclusive remedy for breach of this limited warranty, and shall constitute fulfillment of all liabilities of Sensenich Wood Propeller Company to a customer or user, whether based on contract, negligence or otherwise. IN NO EVENT SHALL SENSENICH WOOD PROPELLER COMPANY BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.

    This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

    The pitch marks indicate general pitch; ex) "3" is a higher pitch than a "2". Generally, one pitch mark gap equals 150 prop RPM per blade, i.e. decreasing the pitch by 1 pitch mark will provide approx. 300 RPM increase for a two blade propeller, 450 RPM increase for a three blade, etc…

    While only three marks are indicated, higher pitches than "3" can be used, up to a maximum of "4".