Getting the anchor right isn't just a matter of comfort, it's a matter of your safety on the water. Many beginners make the mistake of relying on intuition or picking up the first load they get, which, when it's strong, can cause the boat to be demolished or even rolled over. Weight of anchor for PVC boat It must be strictly in line with the displacement of the vessel and the environmental conditions, especially if you plan to fish on a river with a fast flow.
Unlike metal boats, inflatable boats have less inertia and more sailing, making them vulnerable to wind and water. If you calculate the mass incorrectly, you will simply be swept downstream despite the anchor being dropped. In this article, we will take a look at the exact calculation formulas, look at the dependency tables, and choose the optimal design for different types of bottom.
To begin with, it is worth remembering the axiom: the stronger the current and the wind, the heavier the anchor must be, but only to reasonable limits, so as not to overload the transom or the bow of the boat. gold-ruleThe arch says that the weight of the anchor should be about 10% of the displacement of the boat, but during this parameter requires a major adjustment in the big way, ignoring these calculations can cost you expensive equipment or even your life.
Basic principles for calculating the mass of the anchor
The calculation starts with the displacement of your boat, and it's not just the weight of an empty boat, it's the weight of the entire boat, along with the crew, the engine, the gear and the fuel, and that's the number that you start with when you choose. anchorageIf you take an anchor that's too light, it's just going to slide down the bottom, not providing a reliable grip.
There are several proven formulas that are used by experienced water-engines, and one of the most popular ones is that the weight of an anchor in kilograms should be equal to one-eighth or one-tenth of a boat's displacement in tons, but in practice, especially on fast-flowing rivers, these numbers often have to be increased. Heavy current creates an additional load on the anchor phalt, pulling the paws from the ground.
And you also have to consider the sailing of the boat, because the high sides of the PVC boat and the awning, or even the fisherman standing up, create a large area of resistance to the wind, and the wind blows in one direction, and the current pulls in the other, in these conditions. retainer You should be as anchored as possible. Don't skimp on weight if you plan to fish in open water.
Always take anchor with a weight reserve of 20-30% above the minimum calculations if you plan to fish in windy weather or on an unfamiliar body of water.
Table: Dependence of anchor weight on boat length and conditions
So, to avoid making complex calculations every time, you can use a table that's ready to go, and it can help you quickly navigate what you're looking for. load Note that the data are for standing water; if there is a current, the mass must be increased.
The table shows the minimum values required. If the bottom is slurry or sandy, where the legs of the anchor are well buried, you can navigate to the lower bounds. For rocky bottoms or pebbles, where the grip is worse, the weight should be taken from the upper values of the column.
| Boat length (m) | Displacement (kg) | Anchor weight (standing water/wind), kg | Anchor weight (medium current), kg | Anchor weight (strong current), kg |
|---|---|---|---|---|
| 2.4 – 2.8 | 250 – 400 | 2.5 – 3.0 | 3.5 – 4.0 | 4.5 – 5.0 |
| 2.9 – 3.3 | 450 – 600 | 3.0 – 4.0 | 4.5 – 5.5 | 6.0 – 7.0 |
| 3.4 – 3.8 | 650 – 800 | 4.0 – 5.0 | 6.0 – 7.0 | 8.0 – 9.0 |
| 3.9 – 4.2 | 850 – 1000 | 5.0 – 6.0 | 7.0 – 8.0 | 9.0 – 11.0 |
As you can see from the table, the difference in weight for different conditions can be twofold. On a strong current (more than 1.5 m / s), a standard anchor weighing 3 kg for a three-meter boat will be useless - it will simply be dragged along the bottom. Therefore, always have a heavier option in stock or use additional anchoring techniques.
Effect of the bottom type on retention capacity
The mass of the anchor is only half the success, and the second half is the structure of its paws and the type of bottom. anchor It's not going to hold the boat if it's going to slide over smooth rock or concrete slabs, and understanding the subsurface will help you choose the right model.
For slurry and sandy bottoms, type anchors are excellent denforth or HallTheir wide legs easily slam into soft soil, providing a powerful grip even at a relatively small mass, and in such conditions you can use the weight from the bottom of the table, but if there is a rock under the silt, such an anchor can jump off.
A rocky bottom or a pebble requires a completely different approach, and you need anchors with long, sharp pins that can get caught between the rocks, for example. Admiralty anchors or special folding cats. retainer It doesn't depend on the instillation, it depends on the dead hook, and often on rocky rivers you have to increase the weight of the anchor by 30-40% relative to the tabular values.
⚠️ Warning: Never use broad-legged anchors on a heavily grassy bottom. The grass works like lubricant and the anchor will slide across the surface without catching on the ground.
Design features of anchors for PVC boats
The choice of anchor design for an inflatable boat has its own peculiarities: the main requirement is the absence of sharp angles and protrusions that can damage the cylinders, and the anchor must be compact so that it can be conveniently placed in a small space of the cockpit.
The most popular options for PVC boats are:
- 🪢 Folding anchor (Anchor-cat): Perfect for transportation, takes up minimal space. It keeps well on a rocky and grassy bottom, but requires caution when lifting, so as not to tear the fabric of the boat with sharp ends of its paws.
- 🏗️ Denforth anchor (flat): It has excellent holding power on sand and silt, is compact in storage, but its paws can bend when stuck between rocks, and the long spindle requires careful handling.
- 🧱 Concrete or lead blocks: They're often used as a budget option, they don't have paws, so they only hold them by mass and friction, and they're going to have a dramatic decline in their effectiveness over time, and they require a lot more weight.
When choosing, pay attention to the presence of a ring at the end of the spindle (anchor nose). buerkell If the anchor is dead, it's critical for PVC boats, because it's dangerous to pull a stuck anchor directly through the side.
☑️ Checking the anchor system
Anchor False: Length and Material Matter
Fishers often mistakenly believe that it is enough to simply tie the anchor to the boat with a short rope. This is a gross mistake. The length of the anchor end (fala) should be 3-4 times the depth of the reservoir in the parking lot, this is necessary for the anchor rope to lie down, pressing the spindle of the anchor and allowing the legs to properly burrow into the ground.
If you pull the anchor vertically upwards (short phalt), you will simply pull it out of the ground at the first thrust of the boat by wind or wave. Anchor falla It should work as a shock absorber and a lever, and use a rope with a diameter of at least 6-8 mm so that it does not cut your hands when sampling.
The material of the falt is also important. Synthetic cables (nylon, polypropylene) are strong and do not rot, but they stretch very much under load. This can be a plus (depreciation of jerks), but it can interfere. Natural cable stretches less, but wears out faster. PVC is optimal for small boats. polypropylene cordOne that does not sink and is easy to wash.
⚠️ Attention: It is strictly forbidden to tie the anchor tile directly to the bow or stern handle of the boat without using an anchor ditch or duck. If a strong jerk, the handle can break off, breaking through the cylinder, or the boat can turn over.
Anchoring technique on the flow
The correct technique of anchoring on the current is different from standing water. The main rule is: never anchor from the bow of the boat if you stand against the current without preparing for it. The boat can be turned on board to a wave or current, which will create a high risk of overturning.
Algorithm of actions in the course:
- Approach the catch point against the current.
- Lower the anchor to the bottom from the nose, holding the thunder in your hand.
- Allow the boat to slowly pull the phalanx until the anchor picks up a slack and lies on the ground.
- Eat the phala until you reach the desired length (3-4 depth).
- Secure the phala on the anchor duck, making sure the boat has stood up against the current.
If the current is very strong, sometimes it makes sense to use two anchors, spreading them from the nose at an angle ("anchor circuit"), which stabilizes the boat and prevents it from rotating around the axis. anchorage (multi-anchor), which is a heavy gyroscopic structure.
What if the anchor is stuck?
If the anchor is dead and does not yield, do not pull the boat sharply. Try to approach the place of hook as close as possible (string the falt vertically), then sharply pull in the direction opposite to the direction of the paws. If there is an additional rope (buerkell), pull it to turn the anchor.
Security and Typical Errors
Ignoring safety rules when anchoring on a PVC boat can lead to tragedy. The most common mistake is using an anchor that is too heavy without a quick-dump mechanism. If a storm or high tide hits, a heavy anchor can pull a light boat under water or flip it over.
Always carry a knife with a floating blade, attached to a belt or in a prominent place. If the anchor thrust gets entangled in the engine propeller or catches something, you should be able to cut the rope instantly. Security The crew always prioritizes the loss of anchor.
Another mistake is to tie the anchor to the transom (feed) when you're nose-to-current, and that creates a huge stern gap, and the water starts to flood the cockpit, and the boat can quickly sink, and the anchor is always placed from the nose if the boat is facing the wave/current.
Can I use car wheels or weights instead of an anchor?
Car wheels or construction weights can only be used as a last resort, and only on a sluggish bottom where they work like dead weight, and on the flow or rocky bottom, their effectiveness is close to zero, because they don't have paws to hook, and they also have sharp edges that can easily penetrate a PVC cylinder.
What is the maximum weight of the anchor can withstand an inflatable boat?
The limitation is not so much the strength of the cylinders as the stability of the boat. For a standard boat with a length of 3.2-3.6 meters, it is not recommended to use anchors heavier than 10-12 kg, since when sampling such a weight, there is a high risk of rolling and scooping up water by the sides. The optimal range is 4-7 kg.
Do I need to lubricate the anchor before storage?
Iron anchors must be cleaned of sand and dirt, dried and lubricated with solidol or special lubrication to prevent corrosion. Folding anchors made of stainless steel or galvanized require less maintenance, but checking the mobility of hinges is mandatory before each season.
The main conclusion: The weight of the anchor for the PVC boat on the current should be significantly higher than for standing water. Use the table as a base, but always adjust for flow strength and bottom type, adding 30-50% to the mass.