Choosing the right anchor isn't just about buying an accessory, it's about your safety on the water, and many beginners make the mistake of relying on their intuition or their advice and buying the first product they get at the store. anchorage The wrong choice can lead to drift, impacts on the shore or even loss of the boat with a sudden increase in wind.
The modern market offers many designs, from classic “cats” to modern ones. iron-anchor Each of them has a unique geometry of legs and principle of operation. In this article, we will discuss in detail the physics of the process, methods for calculating the required mass and help you choose the ideal option for your body. PVC Or boats.
Before we get to numbers and formulas, we need to understand the basic principle of anchoring, which is that it doesn't just hang on chains, it burrows into the ground using the friction force and the weight of the bottom sediments. If you choose the wrong type of soil, even the heaviest anchor will be useless. anchor It holds well on the sand, but can slide on a rocky bottom, whereas anchor It will show its best side on the silt.
It is important to consider not only the weight of the device itself, but also the specifications. anchor-rope A lightweight heavy chain anchor can be more efficient than a heavy anchor on a thin phala, thanks to what's called the "keel effect." A chain on the bottom creates a tension angle that presses the legs against the ground, improving engagement, and ignoring this fact is a common mistake of small inflatable boat owners.
Also worth remembering is the wind load. sail The pressure of the anchor will be much higher than that of the low-profile kayak, so the estimated mass of the anchor must be safe, and the requirements for the reliability of the anchor system will increase many times in open water or during the course.
Main types of anchors for small vessels
The classification of anchors is extensive, but for small craft, only a few basic types are relevant. Understanding their design features will help avoid buying inefficient equipment. cat anchorIt's a folding four-legged structure that's easy to transport, but has a low holding power on hard ground.
A more advanced option is considered gravity anchorThey don't have movable legs, and they hold them by weight and shape, and their advantage is that they don't get stuck in rocks and snags, which is what happens with paw models, but they do require a lot of weight to be effective, which can be critical for the development of a car. small-boat.
Separately, it is worth highlighting iron-anchor They have great holding power on different types of soil, but they take up a lot of space. For metal boats, this is ideal, whereas for kayaking trips, they are too cumbersome, and the choice is always between weight, size and reliability.
- 🏴☠️ Cat anchor Perfect for storage in a bag, but weak on the flow.
- ⚓ Hall anchor The classic for large boats is rarely used on small craft due to weight.
- 🪨 Gravitational anchor It is reliable on stones, does not require burying.
- 🌊 Danforth anchor - record holder for holding power on sand and silt.
⚠️ Warning: Never use homemade anchors of concrete blocks or bundles of bricks without a metal core. If stuck, you risk breaking the anchor end and losing anchor, and fragments of concrete can damage the boat's cylinders.
Method of calculating the weight of the anchor
There are several empirical formulas for calculating the minimum required mass of an anchor, the most common method is based on the length of a vessel, and it is believed that the mass of an anchor in kilograms should be approximately 10% of the length of a boat in feet, or about 3-4% of the length in meters for calm water. flyboat With their high sailing, this coefficient should be increased.
A more accurate calculation takes into account the sail area and the force of the wind. The formula looks complicated, but in practice, it is enough to know that at a wind of 10 m / s, the load on the anchor can reach tens of kilograms. safety-box For metal boats weighing more than 500 kg, it is better to use the tables of classification societies, where the weight of the anchor can reach 15-20 kg or more.
Steel products are heavier than aluminum counterparts at the same volume, but aluminum corroses more quickly in salt water. Stainless steel If you choose between two types of mass anchor, choose the one whose shape guarantees the best hook on your bottom type.
In winter, when the water is colder and denser, and there are storm winds, the requirements for the weather are high. anchorage In the summer, you can do with the easier option on a calm lake, always adapt the calculations to real-world conditions, not to the perfect images from the catalog.
Dependence of choice on the type of soil
The type of bottom is the deciding factor when choosing an anchor. cat anchor They can just slide across the surface without getting caught, but at the same time, on soft sludge, a heavy gravitational anchor can dive completely into a load that's easy to pull out, but that doesn't hold well when it's jerky.
For mixed soil, where sand alternates with stones, are best suited pin-leg They can flip over and hook even if they fall down badly. Universality is the key word here. If you're going to walk in different bodies of water, you're going to need a compromise or a set of two anchors: the main one and the other. spinning (for difficult conditions).
Grass bottoms are a nightmare for anchorers, grass envelops the legs, preventing them from entering the ground, and anchors with a long stem or special structures with "mustache" that cut grass can help here. anchor Or look for clean spots of the bottom.
| Type of soil | Recommended type of anchor | Efficiency |
|---|---|---|
| Sand | Danforth, Plow. | High. |
| Il/clay | Cat, Admiralty. | Medium/High |
| Stones/Picks | Gravitational, Iron. | High. |
| grass | Specialized with a rod | Low/Medium |
If you often change parking lots, carry a small bag of soil samples taken by a drag to know in advance which anchor to prepare for the descent.
Anchor rope: chain or falt?
Choosing between a chain and a synthetic rope (phalo) is a perpetual dilemma. The chain is heavier, but it has an important property: it lies on the bottom in an arc, extinguishing the boat's jerks on the wave. anchor-hole And the anchor itself, preventing it from being pulled out, and for metal boats, using a chain 3-5 meters long at the anchor itself is standard.
Synthetic anchor-false It's light and comfortable, but it's stretchable and doesn't extinguish jerks as effectively, and it can be cut with a sharp stone or a propeller of a passing boat, but for PVC inflatable boats, the chain can be too heavy and dangerous for cylinders to handle when inactive. nylon cord Or a large-diameter wicker line.
The length of the anchor rope should be at least three depths in the parking lot, and in windy weather - five depths. multiplicityIf you anchor at a depth of 3 meters, releasing only 5 meters of rope, the anchor will be pulled out of the horizontal component of tension, no matter how heavy it is.
- ⛓️ Chain. Reliable, extinguishes jerks, but heavy and can damage the boat.
- 🧶 Nylon phalon Light, floating, but afraid of cuts and sun.
- 🔗 Combined version - a piece of chain at the anchor + fal - the golden mean.
- 📏 Length Always take with a reserve, at least 30-40 meters for large reservoirs.
⚠️ Warning: When using a chain on an inflatable boat, be sure to wrap the chain attachment site to the cylinder or transom with a soft cloth or rubber. The metal in the sun heats up and can burn PVC, and when rolling, wipe the material.
Proper installation and anchoring technique
The anchoring process requires a well-established sequence of actions: first, the boat is led against the wind or current (whichever is stronger), then the anchor sinks to the bottom, but does not throw itself to avoid confusion. anchor-liningAfter touching the bottom, the boat is allowed to slowly drift back, grassing the rope to the desired length.
When the right length is chosen, the rope is fixed and the boat is allowed to pull it. anchorageIf the boat is going down, the anchor is going down, so you have to add lengths or change position, and you can't have a sharp jerk when you're anchoring, because you're pulling the anchor out of the ground instead of pushing it deeper.
☑️ Checklist before anchoring
To get off the anchor, you need to go to the parking point, select a rope weakness and slowly, using the inertia of the boat or short-term operation of the engine, tear the anchor from the ground. You can not pull ahead - you can damage it. turret If the anchor is sucked into the silt, it can sometimes help to wait out the tide or use a breaker.
What if the anchor is stuck dead?
If the anchor is stuck in rocks or drifters, don't try to pull the boat back. Get as close to the anchoring point as possible, pick a tightrope and tie it to the nose chime. Then slowly move around the anchor point in a circle. This can change the angle of thrust and release the anchor. If it doesn't work, you'll have to dive or accept the loss.
Frequent errors in selection and operation
One of the most common mistakes is to buy an anchor that is "growth" or too light "just in case." An anchor that is too heavy is difficult to lift, especially on the current, and it takes up useful space. Too light creates the illusion of safety. The optimal weight of the anchor for a PVC boat with a length of 3.2-3.6 meters is 4-6 kg, unless it is a specialized model with high holding power.
Another mistake is to use rusty or damaged anchors. Rust reduces the strength of the metal, and deformed paws change the angle of attack, making the anchor useless. Regularly check the condition. anchorageYou can lubricate the moving parts and change the worn ropes.
Remember the markings. The rope should have a depth tag, which will help you quickly figure out how much rope has already been fired without taking it all out of the water. water-resistant marker Or plastic buoys tagged, which are little things that save a lot of time and nerves.
The main secret of successful anchoring is not so much the weight of the anchor as the correct length of the rope and the choice of a place with the right soil.
Questions and Answers (FAQ)
Can I use a cat anchor for a metal boat?
Technically, you can if the weight of the cat corresponds to the weight of the boat, but for metal boats, cats are often too light and have a low holding capacity on hard ground. Patent anchors..
How long should the anchor rope be?
The minimum length of the rope should be equal to triple the depth in the parking lot (multiple 3:1). In windy weather or on a multiplicity increase to 5:1 or even 7:1 for reliability.
Why is the anchor crawling down the bottom?
There are several reasons: insufficient weight of the anchor, inappropriate type of soil (for example, smooth clay), too short rope (large angle of traction) or excessive wind load. Try to pass more rope or change place.
Should I remove the anchor after fishing?
Yes, you must, especially if you've been fishing in salt water, wash the anchor with fresh water, dry and lubricate the moving parts and chain. conservatism WD-40 to prevent corrosion.
Which is better for a PVC boat: anchor in the assembly or separately?
For PVC boats, it is more convenient to buy an anchor separately from the rope, so you can choose the optimal length and type of phala (for example, a floating cord), and it is easier to pack the anchor in a sealer or bag so that it does not damage the cylinders with sharp edges.