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In the third of our three blog articles on rudders and steering systems, we look at how to replace rudder bearings and repair a water-saturated core.

How to replace rudder bearings

These are the steps involved in replacing the rudder bearings of a typical spade-type rudder:

  1. Find out where you can get the replacement parts in advance of doing the work as this may take some time. If you need to arrange for parts to be machined it will be necessary to take measurements after the rudder has been removed.
  2. Work out how much clearance from the hull bearing to the ground will be required in order for the rudder to be dropped clear of the hull.
  3. Try and find out how heavy the rudder and shaft will be – rudders can be surprisingly heavy with most of the weight being in the rudder stock.
  4. Discuss your plans with the boatyard and decide how much assistance you will require to remove the rudder.
  5. Support the rudder blade from beneath before you start disconnecting it. One way to do this is to make a support using a canvas tarpaulin tied with ropes to port and starboard deck cleats rope cradle or winches.
  6. If your boat has wheel steering, disconnect the steering mechanism and remove the quadrant.
  7. With the rudder blade supported unscrew the collet that holds the rudder in place.
  8. Lower the rudder gently to the ground.
  9. Remove the old bearings by sliding them off the shaft. These are often made from a very hard wearing engineering plastic known as polyoxymethylene (POM), commonly referred to as Delrin. Note: plastic bearings on small yachts tend to be plain bush type bearings. Yachts over 10m tend to have roller type bearings. Take expert advice on which type you will need.
  10. Take accurate measurements of the rudder stock and the shaft to be sure of the internal and external measurements required for the new bearings.
  11. Slide the new lower bearing onto the rudder stock before refitting the rudder.
  12. Ask the boatyard to help with lifting and refitting the rudder.

Wooden Rudder, Rudder maintenance

Repairing a water-saturated core

 While replacing rudder bearings is not overly challenging for the average DIY boat owner, more major repairs to rudders are not so straightforward. Here are the basic steps involved in repairing a rudder with a water-saturated core:

  1. The first step is to drain out the water from the rudder by drilling a number of holes at the base of the blade.
  2. The seam of the rudder blade is cut using a circular saw and the two halves of rudder are separated. If the rudder is foam filled, this can be removed. Now the damage can be fully assessed.
  3. The condition of the frame and stock need to be checked over. If the framework is badly corroded then this will need to be replaced with a new one that will need to be welded to the stock.
  4. The void will be filled with expanding foam.
  5. The two fibreglass halves of the blade will be re-joined using thickened epoxy for maximum strength and laminated together.

 

Estimating your position at sea

Navigators use a combination of techniques to estimate their position at sea. The primary method used today is GPS (Global Positioning System), a network of 24 satellites that became fully operational in the 1990s and was originally restricted for use by the United States military.

Marine diesel exhaust checks

You should inspect the exhaust system for corrosion damage regularly, especially around the injection bend. If you have noticed the engine exhaust smoking a lot during the sailing season this can also indicate a number of potential problems.

Wooden Hulls – Part 1

Traditional wooden boats have a plank on frame construction, a centuries old boat building method that is still in use today. Variations of the traditional method include carvel, clinker and strip planking, which all relate to the way the planking is attached to the frame.

Steel hull maintenance

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ColRegs – avoiding collisions at sea

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Antifouling for leisure boats – Part 1

Boats that are kept afloat can very quickly become a home for small marine organisms such as barnacles, weed and slime. Applying an antifouling paint to your hull is necessary to protect it from these micro-organisms, as a fouled hull can cause problems and will slow down a boat’s maximum speed considerably if left unchecked.

Wooden Hull Repairs

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2023 Rolex Fastnet Race – Part 2

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Nautical paper charts – a reminder of the basics

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Diesel engine winterisation

An inactive boat engine needs to be protected from corrosion during the winter, caused by the rising humidity levels through the cold months and the salty coastal air. This applies whether the boat is left afloat or hauled out over the winter. Read here about the two important stages of winterisaton for a diesel boat engine.

Repairing chips and dings in gelcoat

The gelcoat topsides of a GRP boat can be pampered and restored to their former glory relatively easily when it is ashore. Gelcoat is only a very thin outer layer of the hull, often less than 1mm thick, so you should avoid cleaning it with highly abrasive cleaners, or an-ything that could potentially damage its surface.

2023 Rolex Fastnet Race

Safe Skipper’s Simon Jollands took part in the 2023 Rolex Fastnet Race – a classic offshore sailing event. This is the first of several articles on the race and focuses on the start.

Cleaning & polishing gelcoat topsides

The gelcoat topsides of a GRP boat can be pampered and restored to their former glory relatively easily when it is ashore. Gelcoat is only a very thin outer layer of the hull, often less than 1mm thick, so you should avoid cleaning it with highly abrasive cleaners, or an-ything that could potentially damage its surface.

Propeller care and maintenance

Propellers are complicated and repairs should be done by specialists but owners can carry out checks and some routine maintenance themselves when the boat is in the boatyard. A propeller is critical to a boat’s performance, fuel consumption and ride, so it makes sense to keep a propeller in good working order.

How a propeller works

Have a look around any boatyard and you will notice quite a variety of propellers – some have two blades, some have three and others have four or more. While most propellers are completely rigid some have blades that fold.

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Sail trimming tips for cruisers. Whether racing or cruising, a well tuned boat will sail faster and tend to heel less than a boat with badly adjusted sails.

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Cutless bearing replacement

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Understanding your boat’s compass

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Electric motors and hybrid systems

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