Martec Folding Prop Installation On Tapered

A Martec folding propeller is a type of propeller that can fold its blades when not in use, reducing drag and improving sailing performance. Martec folding propellers are designed to fit on most standard shafts, but some shafts have a tapered end that requires a special installation procedure. In this article, we will explain how to install a Martec folding propeller on a tapered shaft.

What You Need

A Martec folding propeller that matches your shaft size and pitch. You can order one from the [Martec website] or from a local dealer.

A key that fits the keyway on your shaft. The key should be slightly shorter than the length of the propeller hub.

A propeller nut and washer that fit your shaft thread. You can use the ones that came with your old propeller or order new ones from Martec.

A torque wrench and a socket that fit the propeller nut.

A pair of pliers and a hammer.

A pair of safety gloves and goggles.

Step 1: Remove the Old Propeller

Before you install the new propeller, you need to remove the old one. You can do this either on land or in the water, depending on your preference and availability. If you do it in the water, make sure you have a diver or a helper to assist you and prevent losing any parts. Here are the steps to remove the old propeller:

Martec Folding Prop Installation On Tapered

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Loosen and remove the propeller nut and washer using the torque wrench and socket. You may need to use some penetrating oil or heat to break the nut free if it is corroded or stuck.

Slide the old propeller off the shaft. You may need to tap it lightly with a hammer or use a puller tool if it is tight.

Remove the key from the keyway on the shaft and keep it for later use.

Clean the shaft end and inspect it for any damage or wear. If the shaft is bent, cracked, or pitted, you may need to replace it or have it repaired by a professional.

Step 2: Install the New Propeller

Now that you have removed the old propeller, you are ready to install the new one. Here are the steps to install the new propeller:

Remove the blades from the new propeller hub by unscrewing the pivot pins and cotters using the pliers. Be careful not to lose any parts or damage the blades.

Fit the key to the keyway on the shaft and slide the new propeller hub onto the shaft. The hub should go up to the mark on the shaft. If not, the key may be fouling and will have to be machined correctly.

Align one of the holes in the hub with one of the holes in the nut using a small screwdriver or a nail. This will ensure that the blades can be reinstalled later.

Slide the washer onto the shaft and thread the nut onto the shaft. Tighten the nut using the torque wrench and socket to the specified torque value for your shaft size. Do not over-tighten or under-tighten the nut as this may cause damage or vibration.

Reinstall the blades onto the hub by inserting the pivot pins and cotters into their respective holes. Make sure that each blade is oriented correctly and that each pin and cotter is securely fastened.

Check that the blades can fold and unfold smoothly and that there is no play or wobble in the hub or blades. If there is any problem, you may need to adjust or replace some parts.

Step 3: Test Run

After you have installed the new propeller, you should test run it to make sure it works properly and safely. Here are some tips for testing your new propeller:

Start your engine and shift into forward gear at idle speed. Check that the propeller unfolds and spins smoothly and that there is no unusual noise or vibration. If there is, stop the engine and check the installation again.

Increase the engine speed gradually and check the performance and handling of your boat. Make sure that the propeller does not cavitate, slip, or over-rev. If it does, you may need to adjust the pitch or change the propeller size.

Shift into reverse gear and check that the propeller folds and stops spinning quickly and that there is no drag or resistance. If there is, you may need to lubricate or clean the hub or blades.

Repeat the test run several times in different conditions and speeds to ensure that the propeller works consistently and reliably.

Conclusion

A Martec folding propeller can improve your sailing performance by reducing drag and increasing speed. However, installing a Martec folding propeller on a tapered shaft requires some special steps and tools. By following this article, you should be able to install your new propeller safely and easily. If you have any questions or problems, you can contact Martec for support or consult a qualified mechanic.

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