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A boat shaft log is a device that attaches to the inside bottom of a boat to keep water from coming in. It is one of the most simple and low-maintenance items on a boat. It is made up of three parts: the shaft log, the stuffing box, and the flexible hose connector that attaches the two together. The shaft log is usually made of bronze or fibreglass.
| Characteristics | Values |
|---|---|
| Number of parts | 3 |
| Maintenance | Simple and low |
| Fastening | Nuts |
| Attachment point | Inside bottom of the boat |
| Function | Keep water from coming in |
| Materials | Fibreglass or bronze |
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What You'll Learn
The three parts of a shaft log
The shaft log is a device with three parts: the shaft log itself, which attaches to the inside bottom of the boat; the stuffing box; and the flexible hose connector that attaches the two together. The shaft log is one of the simplest and most low-maintenance items on a boat.
The shaft log is designed to keep water from coming into the boat. Before the invention of the shaft log, boats used oars or propellers, but they would often sink. In the late 1800s, a solution was found in industrialised America: a rigid box was built around the shaft, using a pine tar solution to form a tight, glue-like seal. This worked well when the boat was sitting at the dock, but not when it was moving.
Today, shaft logs are often made of bronze and have a flange and a short stub that goes into the hull of the boat. The stub is usually around 1 3/4 inches in diameter. Some shaft logs are made of fibreglass, which is glassed into the hull.
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How to install a shaft log
A shaft log is a device with three parts: the shaft log itself, the stuffing box, and the flexible hose connector that attaches the two together. The shaft log attaches to the inside bottom of the boat. To install a shaft log, follow these steps:
- First, you need to decide on the type of shaft log you want to install. There are a few options available, such as the fiberglass G10 tube or the bronze shaft log stub. Consider the size and material of the shaft log to ensure it fits your boat's hull.
- Prepare the hull by cutting and reaming the existing shaft log or any other obstructions to match the dimensions of the new shaft log. Ensure that the surface is clean and free of any debris.
- Install the new shaft log by sliding it into the hull. Make sure it is securely attached and aligned correctly.
- Connect the shaft log to the stuffing box using the flexible hose connector. Ensure that all connections are tight and secure.
- Finally, tighten the nuts on the shaft log, both outside and inside the jamb. You can now take your boat out for a test run.
Remember to refer to the specific instructions provided by the manufacturer of your chosen shaft log, as installation procedures may vary slightly between different models and types.
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The history of the shaft log
The shaft log is a simple and low-maintenance part of a boat. It is made up of three parts: the shaft log itself, which attaches to the inside bottom of the boat; the stuffing box; and the flexible hose connector that attaches the two together.
Over time, the design of the shaft log has been improved and adapted for different types of boats. For example, most shaft logs in sailboats are now made of fibreglass, which is glassed into the hull. More recently, the Buck Algonquin catalogue has offered a bronze shaft log stub with a nice flange, which fits into the hull of the boat.
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Shaft logs in Viking ships
Viking ships did not have shaft logs, which is why they used oars instead of propellers. Their boats kept sinking when they tried to use propellers.
A shaft log is a device with three parts: the shaft log itself, which attaches to the inside bottom of the boat; the stuffing box; and the flexible hose connector that attaches the two together. The shaft log keeps water from coming into the boat.
The shaft log is usually made of bronze and has a flange and a short stub that goes into the hull of the boat. The stub is about 1 3/4 inch OD.
To install a shaft log, you need to tighten the nuts down, both outside and jamb. You don't need to add oil.
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Shaft logs in sailboats
The shaft log is attached to the inside bottom of the boat, with a stuffing box and a flexible hose connector joining the two together. The hose is usually made of fiberglass and is glassed into the hull.
Some shaft logs have a nice flange and a short stub that goes into the hull of the boat. This stub is usually around 1 3/4 inches in diameter and may require some cutting and reaming to fit into the existing shaft log.
Overall, the shaft log is a simple and low-maintenance item on a boat, requiring only the tightening of nuts before use.
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Frequently asked questions
A boat shaft log is a device with three parts: the shaft log that attaches to the inside bottom of the boat, the stuffing box, and the flexible hose connector that attaches the two together.
A boat shaft log works by keeping water from coming into the boat.
A boat shaft log is simple and low-maintenance. It is also easy to install, requiring only the tightening of nuts outside and inside the jamb.
Boat shaft logs can be made from a variety of materials, including fiberglass, bronze, and pine tar.
