Choosing the right anchor is not just a matter of convenience, it's a critical aspect of water safety. Many inflatable swimmers make the mistake of relying on intuition or buying the first anchor they find at a store. Underweight Leads to the boat drifting under the influence of wind or current, which can result in collision with other boats or washing ashore.
On the other hand, it is excessively heavy. anchor It is important to find the “golden mean” that will ensure reliable retention of the vessel in different weather conditions. In this article, we will discuss proven methods of calculation, types of designs and nuances of choice of equipment for PVC boats.
Understanding the physics of the process will help you avoid mistakes. Retention force It depends not only on the weight of the object itself, but also on its shape, the type of soil and the angle of application of the load. A competent approach to the choice of equipment will allow you to safely fish or relax without fear for your safety.
Formulas and methods for calculating the mass of the anchor
There are several common techniques for determining the required mass of an anchor, the most common and simple method is based on the displacement of a vessel. It is believed that for a safe stay, the mass of the anchor should be approximately 10% of the displacement of a boat, a rule that works well for small inflatable boats, where sailing and passenger weight play a key role.
However, for more accurate calculations, especially if you plan to use a boat in high current or wind conditions, it is better to use a formula that takes into account the dimensions of the boat. anchor mass = (L × B × H) / K, where L is length, B is width, H is height, and K is a coefficient that depends on the type of anchor. For classic cats and Admiralty anchors, this coefficient is usually 100 if you take the dimensions in meters and the result is in kilograms.
⚠️ Attention: These formulas give a baseline value. If you plan to anchor in the current or in the wind above 5-7 m / s, you need to add 20-30% margin of safety to the calculated weight.
Also worth considering is the material that anchors are made of. proportion It's smaller than steel, so to achieve the same retention force, the cast iron anchor needs to be larger, and steel anchors are more compact and stronger, which is important for storing in a tight cockpit of PVC boats.
For boats up to 3 meters long, an anchor weighing 1.5-2 kg is often enough, unless the bottom is slurry and there is a strong current.
Effects of soil type and operating conditions
The type of bottom soil is a crucial factor in choosing the type and weight of anchors. The same anchor may hold perfectly in the sand, but it is absolutely useless on a hard clay bottom or in grass thickets. The sandy bottom is considered universal - almost all types of anchors work here, from simple "cats" to plow-like structures.
On a rocky bottom, the situation is more complicated, where heavy anchors can simply slide off the surface of the stones without getting caught, and in these cases, fungus anchors or special structures with increased adhesion area are often used. The clay bottom It has high stickiness, but the anchor must be able to "bury", so the shape of the paws is critical.
- 🌊 Sand: Ideal for cat anchors, admiralty and plow-shaped models.
- 🪨 Stone: Requires anchors with wide paws or designs of the type "mushroom", sometimes it makes sense to use two anchors.
- 🌿 Grass/Vegetation: A large weight or anchor with long horns is needed, capable of piercing the vegetation layer to the ground.
- 🟤 Eil: You need anchors with a large paw area, so as not to fall too deep, but also not to slide on the surface.
And remember, the deeper the parking lot, the longer the anchor shaft, the more weight it puts on the anchor, making the legs more resistant to attack. But in shallow water, the long shaft can get in the way, and that's where the most important thing is. anchor-mass And its ability to burrow quickly.
Comparative table: Boat length and anchor weight
For quick orientation, you can use the matching table, which is based on average data for standard operating conditions (moderate current, wind up to 5 m/s), remember that this is a reference data, and for extreme conditions, adjustments are required.
| Boat length (m) | Recommended weight of anchor (kg) | Type of anchor | Diameter of the fale (mm) |
|---|---|---|---|
| 3.0 | 1.5 - 2.0 | Cat/Denforth | 4 - 6 |
| 3.0 - 3.6 | 2.0 - 3.0 | Sailor/Cat | 6 - 8 |
| 3.6 - 4.2 | 3.0 - 4.5 | Admiralty/Plow | 8 - 10 |
| 4.2 - 5.0 | 4.5 - 6.0 | Halla/Plow | 10 - 12 |
As you can see from the table, as the size of the boat increases, the weight requirements of the anchor increase nonlinearly. For large boats, not only weight, but also weight becomes critical. paw-buildingA lightweight but well-designed anchor can hold better than a heavy shapeless weight.
Pay attention to the diameter of the anchor shaft. A thin rope can simply cut your hands when you sample the anchor under load, and also wear out faster. squirrel diameter from 6 to 10 mm, which do not rot and are pleasant to the touch.
Types of anchors for inflatable boats
The market offers many options, but not all are suitable for PVC boats: compactness in folded form, no sharp edges that can damage the cylinder, and sufficient retention power. One of the most popular options is the cat anchor.
The cat anchor is a central spindle-shaped rod with four legs, and in the folding version, the legs are pressed against the rod, which makes it very compact. It's perfect. versatile It holds well on a rocky and grassy bottom, but it can work poorly on soft mud.
The Secret of a Folding Cat
Make sure the paw-fixing mechanism is reliable. If the splint or threaded connection weakens, the anchor may fold at the most inopportune moment, and you will be left without an anchor.
Another popular type is type anchors. denforth They have two broad legs and a long spindle, and they have great holding power relative to their own weight, especially on sand and clay, but they are more cumbersome to store and can get stuck in rocks with their paws.
- ⚓ Anchor-mushroom: Perfect for a slurry bottom, but poorly held on solid ground, often used as a stationary anchor.
- ⚓ Plutose: They are excellent at burrowing in the sand, but require a long phalt for the correct angle of attack.
- ⚓ Raids (Admiralty): Classics, reliable, but have protruding parts, dangerous to PVC.
⚠️ Attention: When using metal anchors in a PVC boat, always use a protective case or storage bag. Sharp edges of the paws can easily puncture the balloon when rolling or sloppy stowage.
Choice of anchor tile and chain
Many beginners mistakenly believe that it is enough to simply tie a rope to the anchor, but the right tooling involves not only the anchor itself, but also the anchor itself. anchor-chain The chain, lying on the bottom, presses the spindle of the anchor, providing the correct angle of burying the legs in the ground.
For PVC boats, heavy chain use is often impractical due to limited load capacity. anchor-line It's a lead weight or just a piece of heavier rope that's 1-2 meters long, and it's going to help the anchor get down to the bottom.
The falt itself must be strong but buoyant so that it can be easily selected from water. Synthetic materials such as polypropylene or nylon are best suited. The falt should be at least 3-4 depths in the parking lot. If you stand at 3 meters, the length of the falt should be at least 10-12 meters.
☑️ Checking the anchor system
Practical tips for installation and removal
The anchoring process on a PVC boat has its own peculiarities, the main one being the inability to safely navigate an inflated cylinder. So all manipulations must be carried out sitting on a bank (seat) or on the bottom of a boat, and you should approach the parking place against the current or against the wind.
Lower anchor smoothly, squishy phalo. A sharp throw When the anchor touches the bottom, let the boat back a little (under the wind or the engine at low speeds) so that the anchor will lay down and begin to burrow.
To remove the anchor, never pull it vertically upwards if it's stuck. Go as close as possible to the anchoring site, select a slack of the phala and create a horizontal force. Often the anchor comes out of the ground "reversely." If the anchor is stuck dead, use the boater (float) on an additional phalt tied to the anchor's head to pull it by the tail.
Never tie the anchor shaft rigidly to the boat without the possibility of a quick discharge. In the case of strong wind or current, the boat can flip or drag under water.
Frequently Asked Questions (FAQ)
Can a concrete anchor be used for a PVC boat?
Concrete anchors are possible, but not recommended. Concrete is fragile and can open when hit by rocks. In addition, concrete anchors usually have a rough surface that can damage the boat's cylinder. It is better to use metal folding models.
Which is the best way to use a slap?
For fastening the fag to the anchor rift is best used double-slag or gatewayThese nodes are reliable, do not untie spontaneously under load and are relatively easy to untie after loading is taken off. Be sure to leave a free end for insurance.
Do I need an anchor if I fish in the river with the current?
On a river with a strong current, the anchor can be even more dangerous than its absence, since the boat can turn side to wave and flip. anchor-curve Or to cuckle from the nose and stern at the same time, or use the anchor shaft to control the position, not lowering the anchor to the bottom.
How to keep a wet anchor after fishing?
The metal anchor must be washed with fresh water (especially after salt water) and thoroughly dried before packaging. It is better to store it in a separate bag so that rust or dirt residues do not damage the fabric of the boat. You can smear the moving parts of the folding anchors with light lubrication.