The right selection anchorage This is a critical aspect of the safety of an inflatable vessel, and many newcomers mistakenly believe that a light inflatable boat can only throw overboard any heavy object, but it is not easy to do so. PVC anchorage The vessel must be strictly in accordance with the displacement of the vessel and the water conditions, and insufficient mass will lead to the fact that the vessel will drag along the bottom, and excess can damage the transponder or cylinders during jerks.
In this article, we will examine the physics of the process, examine the proven formulas of calculation and study the features of various designs. load This is not the only parameter that affects the reliability of the parking lot, and how to choose the right anchor for specific tasks of fishing or recreation.
The Physics of Retention: Why Weight Is Not Just Important
The main task of any anchor is not to simply lie on the bottom, but in the ability to burrow into the ground or catch on to the irregularities of the relief. Containment power It depends on the combination of the weight of the product itself, the length of the anchor phalin and the type of bottom. If you use the wrong design, even heavy loads will slide over the silt or rocks under the influence of wind and current.
For inflatable boats, the situation is complicated by their low mass and high sailing. PVC It has very low displacement, without a motor or with a low-power outboard motor, which makes it vulnerable to side wind. weight-bearing Not only the length of the boat, but also the expected wind strength.
There is a common misconception that the heavier the better, but for a light inflatable boat, an overly heavy anchor poses a risk of damage. coatboard The balance between the inertia of the vessel and the weight of the cargo is a key factor in safe parking.
Use the anchored rump on the bow of the boat to fasten the faline to avoid turning the boat side to the wave, which greatly increases stability.
Classical formulas for calculating the mass of the anchor
To determine the optimal weight of equipment, experienced water-engines use two main calculation methods: the first, more simple, is based solely on the dimensions of the vessel. anchorage It should be about 10% of the length of the boat in centimeters, for example, a 320 cm long vessel would require a load of about 3.2 kg.
The second formula is displacement-based and more accurate for different operating conditions, which requires anchor weight to be 1/10th of the total displacement of a boat, a method that allows for more accurate matching of equipment for boats that carry a significant supply of fuel, equipment and passengers.
- 🚤 Length method: Weight (kg) = Boat length (cm) / 100.
- ⚖️ Displacement method: Weight (kg) = Displacement (kg) / 10.
- 🌬️ Wind correction: With a strong wind or current, the mass should be increased by 20-30%.
If you plan to fish on a fast-flowing river or on a large reservoir where it is often windy, the result should be rounded up. For PVC boats less than 3 meters long, the minimum recommended weight of the anchor is 1.5-2 kg, regardless of the calculations.
Formulas give a base value, but real conditions (wind, flow) always require a margin of mass or the use of an anchor with better engagement.
Effects of bottom type and operating conditions
The choice of anchor depends on the ground you want to anchor over, and the sandy bottom is considered ideal for most types of anchors, because the paws are easily submerged in a soft structure. cat anchor or Admiralty The option will keep the boat secure.
The situation is very different if the bottom is rocky, grassy or covered with a layer of rotten foliage. On rocky soil, heavy anchors can get stuck between boulders, and their rise will become impossible without a special detachment device, while on the sluggish bottom, the paw area is important so that the anchor does not fall too deep and lose traction.
⚠️ Warning: Never use anchors with sharp spikes pointing downwards on inflatable boats without special protection, as they can easily pierce cylinders when lifting.
For fast-flowing rivers, it is not so much the mass that is critical, as the aerodynamics of the anchor itself and the ability to burrow quickly. Heavy loads on the cable can simply lie on the bottom, while a lightweight but properly designed anchor (such as a type of anchor). denforth) will hit the ground and will hold the load by ground resistance.
Overview of types of anchors for inflatable boats
The market offers many options, but for PVC Not all of them are suitable, but the basic requirements are compactness in transportation and safety for inflatable elements, and let's look at some of the most popular designs that have proven themselves in use.
The most common option is cat anchorIt's a folding four-legged structure that takes up the minimum amount of space in the bag. However, its holding capacity is relatively low, and it's more suited to calm water or as an additional anchor for the boat's tension.
A more effective solution is considered to be anchor type. denforth or sailorThey have great grip on sand and silt, and because of their flat shape, they can easily hide in a flundock. mushroom-anchor, which work on the principle of suckers, but they are effective only on soft slurry soil.
- 🐙 Cat anchor: Compact, foldable, versatile, but weakly keeps on the flow.
- ⚓ Denforth: High retention force, flat, ideal for sand and silt.
- 🍄 Mushroom: Silent, good for a muddy bottom, useless on stones.
The choice also pays attention to the material. Steel anchors are strong but corrosive, so require careful care. Aluminum analogs are lighter, which is important for small boats, but they are less durable and can deform when hit by stones. Galvanized steel It is considered the middle ground in terms of price and durability.
Table of correspondence of the weight of the anchor and the length of the boat
To make the choice easier, we suggest using a composite table, which is based on average load and standard operating conditions in inland waters, and is the recommended minimum for safety.
| Boat length (m) | Min. anchor weight (kg) | Optimal weight (kg) | Type of bottom |
|---|---|---|---|
| 3.0 | 1.5 | 2.0 - 2.5 | Sand, silt |
| 3.0 - 3.5 | 2.5 | 3.0 - 4.0 | Mixed |
| 3.5 - 4.0 | 3.5 | 4.0 - 5.0 | Sand, clay |
| 4.0 - 4.5 | 4.5 | 5.0 - 6.0 | Anybody |
It is worth noting that when using a boat in sailing mode or in open water with a large wave, these values should be increased. Safety margin It's never too much to do with security, and it doesn't take into account the use of anchor hacks or special nodes that can improve retention efficiency.
The secret to secure parking
Increase the length of the anchor cable to 3-4 depths. The more hollow the cable goes to the bottom, the more effective the anchor works, since the force of thrust is horizontal, pressing the legs to the bottom, rather than pulling them up.
Anchor cable and correct installation
Even perfectly matched anchorage It won't work without a properly organized anchor system. The main element here is a cable or falin. The use of a chain for light PVC boats is not recommended due to the large weight that can damage cylinders when stored or lifted.
The optimal solution is a synthetic cable made of polyamide or polypropylene with a diameter of 4-6 mm. Polyamide (nylon) is preferable, since it has the property of stretching under load, working as a shock absorber and extinguishing the thrust of the boat on the wave. The length of the cable should be at least three depths in the parking lot, and in windy weather - four or five depths.
⚠️ Warning: Never tie the anchor cable directly to the inflatable cylinder. Mounting should only be done through a special ruffled bolt on the transom or a nose jar, lined with a plate.
When anchoring from the bow of the boat (which is correct for holding the vessel against the wave), make sure that the cable does not rub against the side. This can be done by using a remote duck or a special arc. If the anchor is placed from the stern, make sure that the jet from the engine or waves does not overflow the cable, which can lead to the loss of anchor.
☑️ Checking the anchor system
Safety Techniques and Frequent Errors
Ignoring the rules of anchoring can lead to serious consequences, including the loss of a boat or injury to people. One of the most common mistakes is to throw an anchor without unwinding the cable sufficiently long beforehand, in which case the anchor can get entangled in the boat or hit the passenger.
Another common problem is the wrong lifting of the anchor, pulling the rope with your hands, especially if the anchor is stuck or has a significant weight, is dangerous for the back and fingers. PVC boats often use simple lifts or simply choose a cable, going through it with their hands, but at the same time, they use the simplest lifts. boat It should be placed strictly above the anchor so that the thrust is vertical.
Always carry a knife with a floating blade or mounted on a lace. If the anchor cable winds up on the engine screw or gets tangled in the driftwood, being able to cut it quickly can save the situation. Don't try to untangle the cable while in the water next to the engine running.
The main principle of safety: the anchor cable should always be free of knots and hinges, and the knife for cutting it is available in one second.
Can I use a homemade anchor from brake discs or pipes?
The use of homemade structures is possible, but requires careful testing, the main risk is sharp edges and rust, which can damage the structure. PVCIf you anchor yourself, be sure to cloak all sharp edges, round the corners and cover the product with anti-corrosion paint.
Do I need to lubricate the anchor before storage?
Yes, metal anchors, especially steel anchors, must be washed with fresh water and dried after each foray into the water. Before long-term storage, it is recommended to lubricate the rubbing parts (for example, the axis of the legs of a cat) with a consistent lubricant to prevent acidification.
What if the anchor is stuck dead?
Don't pull the boat abruptly, it can damage the transom. Try to approach the anchor point from different sides, choosing the weakness of the cable. If there is a buyrep, use it. In extreme cases, if the anchor is not sorry, you can try to uncoil it by tying the cable to the powerful engine of another boat, but this is risky for you. fly-boat.