Finding a reliable anchor for an inflatable boat often turns into finding a compromise between weight, size and tenacity. Market offerings are either too expensive or ineffective on a difficult bottom, and classic cats tend to get stuck in rocks or driftwoods, which can cost you boats. brake-bar It has become a real hit among water-engineers looking for budget and reliable solutions.
Designed by smart fishermen, the design combines ease of manufacture and high efficiency. The old cast-iron disc from a passenger car has the perfect weight to hold lightweight swimmers and, most importantly, is easily released by a simple jerk for a special cable. It's not just saving money, it's a matter of safety of your equipment on the water.
In this article, we will go into detail about why this material is so popular, how to calculate the required weight and step by step describe the process of turning a car part into reliable marine equipment.
Advantages of design and choice of material
The main reason for popularity brake discs The cast iron, from which they are cast, has a high density, which allows you to get a significant weight at a relatively compact size. For a PVC boat, where every extra kilogram in the equipment is palpable, this is a critical parameter. A standard disc weighs from 4 to 6 kg, which is already the working weight for holding a boat at medium strength.
Unlike steel corners or pipes, which often use homemade discs, cast iron disks do not require complex processing to weight. Its shape is originally designed to withstand high temperatures and loads, which in anchor conditions is transformed into resistance to deformation when hitting the bottom. Central opening in the disk is ideal for placing a loader or pouring lead, if you want to increase the weight.
When choosing a donor, pay attention to the degree of wear: a too thin disk can split when hitting stones, so it is better to take parts with a residual thickness of at least 15 mm.
Another undeniable advantage is the shape of the product: ventilation ducts and rigidity ribs create additional resistance to water when submerged and provide better grip to the ground than a smooth surface. In addition, this design almost never gets stuck dead, since it has rounded edges and no sharp legs that could be wedged between the stones.
- 🛡️ High strength: Cast iron can withstand serious mechanical loads without deformation.
- ⚖️ Optimal density: The compact size at high weight makes it easy to transport the anchor in a boat bag.
- 💰 Availability: You can find an unnecessary disk on any auto-disassembly or in the garage of friends almost free of charge.
- 🔄 Safety of recovery: The design allows you to implement a system of “uncoupling”, reducing the risk of loss of anchor to zero.
Necessary tools and weight calculation
Before you start the assembly, you need to decide on the target weight of the product. For inflatable boats up to 3 meters long, an anchor weighing 4-5 kg is usually enough. If you plan to fish on the current or wind on larger vessels, the weight should be increased to 7-8 kg. To do this, you can put an additional metallic crumb into the central opening of the disk or pour molten lead there. The calculation is based on a simple formula: 1 kg of anchor weight per 1 meter of boat length for calm water, and 1.5 kg per meter for difficult conditions.
You'll need the minimum toolkit that most men have to make. Bulgarian (a coal grinding machine) for stripping and cutting metal, and also a welding machine. If welding is not available, you can use powerful bolt joints, but welding provides a monolithic structure, which is preferable for dynamic loads on the anchor cable.
It is also important to prepare materials for mounting the rift and organizing the uncoupling system. You will need a strong metal eye (rim-bolt), a segment of a steel chain or cable with a diameter of 6-8 mm, and a nylon cord for breaking joints. Remember personal protective equipment: glasses and gloves, because working with cast iron and metal involves the formation of sparks and metal shavings.
When calculating weight, consider not only the length of the boat, but also the area of its sailing. High sides and the presence of an awning or tent increase the wind load, which requires a heavier anchor. However, remember that for PVC boats, excessive weight is also harmful: it puts extra stress on the transom and cylinders when lifting.
Step-by-step instructions for assembling anchor
The process of creating an anchor starts with preparing the base. If you use a whole brake disc, it needs to be thoroughly cleaned of rust, old paint and brake dust. This can be done with a metal brush on a Bulgarian or sandblasting. A clean surface will provide better adhesion if you plan to paint the product, and allow you to visually monitor the condition of the metal for cracks.
The next step is to install a bolt rim. In the normal central opening of the disc ( hub), you need to boil or insert a steel eye over the epoxy glue with a bolt fixed. Some craftsmen weld the bark directly to the rim of the disc, but the central location is considered more balanced. If you decide to increase the weight, place a lead casting or steel cargo inside the central opening, before lubricating the surfaces for better contact.
The key is to organize the detachment system, and to do this, an additional cable is attached to the bottom of the anchor (to the rim of the disc), and the attachment point must be shifted relative to the main spindle, so that when the anchor is pulled, it will be turned over and exit the hook by the reverse side, in practice, this is accomplished by welding the ring to the bottom of the disk or using a special sliding load on the main cable.
☑️ Checklist for anchor assembly
The finishing is painting. Use special corrosion-resistant metal paints, preferably hammer-type paints or epoxy soils, and they create a strong film that protects cast iron from rapid rusting in water. Although the rust on the anchor cable is not as bad as on the boat hull, it can stain gear and shorten the life of metal elements.
Organization of the uncoupling system
The uncoupling system is what distinguishes the professional from the amateur approach, and the principle of its operation is simple: the anchor is held by the main cable, but in the case of a dead hook, you pull the auxiliary line, which changes the angle of application of force, and the anchor slips out. To implement this, the brake disc most often uses a sliding load (clutch) or a second attachment point.
In the classical scheme, a ring is welded to the bottom of the disc (opposite the bolt-rope), and a thin but strong line (buyrep) is attached to it, which passes through the ring of the main rook and goes to the side of the boat or is fixed on the main cable. When the main cable is tensed, the anchor lies on the back and holds the boat. When sampled by the buffet, the disk stands on the edge and slides off the obstacle.
⚠️ Attention: Never use a material that is prone to rotting or stretching for a buyrep (uncoupling line); a 3-4 mm diameter wicker cord is ideal. If it bursts at the time of the hook, you will lose anchor.
There is a simpler version, where the detachment is implemented through a sliding clutch on the cable itself, in which a ring is attached to the bottom of the disc, which winds the end of the main cable, and the clutch itself slides along the cable, but for the brake disc, the circuit with a rigid second line is considered more reliable, since it is less prone to crossovers.
Comparison of specifications of homemade anchors
To make sure you are right, compare the brake disc anchor to other popular options, and the table below will help you evaluate the effectiveness of different types of PVC boat anchors.
| Type of anchor | Weight (kg) | Engagement | Risk of loss | Price. |
|---|---|---|---|---|
| Brake disc | 4-6 | High. | Low (with a detachment) | Low. |
| Cat anchor | 2-4 | Medium | Highly | Medium |
| Hall anchor | 5-10 | Very high. | Medium. | High. |
| Giriah/Concrete | Anyone. | Low. | Very tall. | Low. |
As you can see from the table, brake It's a big winner, because it's heavier than a standard cat, which gives you an advantage over the course, and it's much safer to use because it's a good webbing system, and concrete or lead weights, although cheap, have a smooth surface and often just lie on the bottom without burrowing, which reduces their holding power.
The main advantage of the brake disc anchor is the combination of the high holding power of the cast iron body and the minimum risk of loss due to the simple uncoupling system.
Operation and maintenance of anchor
Proper use of the anchor extends the life of not only the device itself, but also your boat. When anchoring, always poison the cable with depth and wind. The anchor end should be at least 3-4 lengths of depth in the parking lot. If you are standing at a depth of 2 meters, etching at least 6-8 meters of the cable. This provides a gentle angle of thrust, allowing the anchor to burrow into the ground, rather than dragging along the bottom.
After every fishing, especially in salt water, the anchor needs to be washed with fresh water. Cast iron is prone to rapid oxidation, and although a rusty anchor works as well as a new one, corrosion products can stain the clothes and floor of the boat. Periodically check the condition of welded seams and rum bolt fastenings. Vibration and impacts on stones can cause microcracks.
How to keep an anchor in the off-season?
Before long storage, lubricate the metal parts of the anchor with conservation lubricant or waste oil. It is better to store it in a dry place, hanging or putting it on a wooden stand to avoid contact with the wet floor of the garage.
Also, you should monitor the condition of the anchor cable. If you use a detachment system, make sure that the additional line is not confused with the main one. For ease of storage and transportation, the anchor from the brake disc can be equipped with removable paws or simply carefully stacked in a separate bag so as not to damage the boat cylinders with sharp edges (if they are left after processing).
Frequently Asked Questions (FAQ)
Can I use an anchor from a brake disc on the sea current?
Yes, but with limitations. The weight of a standard disc (4-5 kg) may not be sufficient for a strong surf or current. In such cases, it is recommended to either use two anchors or weight the center of the disk with lead up to 8-10 kg. Also important is the quality of the uncouple, since on the rocky seabed the risk of getting stuck is higher.
Do I need to cook an anchor if there is no welding machine?
Welding is preferable, but not necessary. The rump bolt can be secured with a long bolt, washers and nuts, planted on epoxy glue or fixed by cleavage. However, this design will be less reliable under jerking loads, so you will have to check the fastenings more often.
Which cable is better to use for such an anchor?
The best option is a wicker synthetic cable (polyamide or polypropylene) that does not rot, does not absorb water and is pleasant to the touch, the rope should be bright in color so that it can be seen in the water, and have a burst load of at least 200-300 kg.
Why doesn't the anchor keep the boat on a clay bottom?
On a slippery clay disk, the anchor may not burrow, but slide, in which case it helps to increase the length of the anchor end (to reduce the angle of attack) or use an anchor with more pronounced legs. The braking disc on clay holds worse than on sand or stones, so the supply of the cable needs to be increased.