Weight anchor for PVC boat 320: accurate calculation and choice

Inflatable boat owners often face a dilemma: take anchor "just in case" or follow the calculations strictly. For a 320 cm long PVC boat, this issue is especially acute, since the balance between payload and safety is critical here. anchorage It can either not keep the boat in a gust of wind, or hopelessly overload the cockpit, making the voyage uncomfortable and dangerous.

Many beginners mistakenly believe that it is enough to buy the first anchor weighing 4-5 kg, believing that “the porridge with oil can not spoil”. However, for an inflatable body weighing 320 cm assembled, the excess weight on the nose or in the stern changes the trim, reducing the performance and increasing the risk of getting a hole in its own rigid elements. weight-bearing It allows for reliable parking without compromising maneuverability.

In this article, we will discuss the physics of the process, calculation formulas and practical nuances of choosing an anchor system for small inflatable boats. You will learn why in some situations 3 kg may not be enough, and in others - 6 kg will become an unnecessary burden. Understanding these principles will help you avoid demolition on the fairway or, conversely, not dragging extra pounds on fishing.

Factors affecting the required mass of the anchor

Choosing the optimal anchor weight for a PVC 320 cm boat is not just following a table from the Internet, but a comprehensive assessment of operating conditions. sailability A boat with a tent mounted, high sides or just with the seats-banks raised catches the wind like a sail, creating a significant lateral force that the anchor should compensate for.

The second critical parameter is current strength and depth at the berthing site, and on the faststring, the current affects the submerged part of the boat (kilson, bottom), putting additional stress on the anchor cable. Hydrodynamic resistance It grows proportionally to the square of the current speed, so even a small increase in the water speed may require a twofold increase in the weight of the cargo.

⚠️ Warning: Never calculate anchor weight by boat length alone. A two-seat inflatable boat with two anglers in warm clothing and a stock of tackle has a completely different displacement and sailing capacity than an empty vessel.

Also, the type of bottom: clay or slurry soil requires an anchor of a smaller mass, but a certain shape (for example, paw), which can be buried. cat anchor Or mushroom variant, whose holding power depends primarily on weight, not the ability to burrow.

Formula for calculating the weight of the anchor for the boat 320 cm

There are several empirical formulas for calculating the minimum mass of an anchor. One of the most common techniques, often used in small fleets, is based on the displacement of a vessel. Inflatable boats, where the full weight is often unknown accurately, use a simplified calculation that depends on the length of the hull and wind load.

The classic formula is as follows: the weight of the anchor (in kg) is equal to 10% of the displacement of the boat (in kg). For a PVC boat 320 cm, the maximum displacement is usually about 400-500 kg (depending on the model and number of people). However, given that the boat is rarely loaded to the limit, for calm weather, often use a factor of 1/15 or even 1/20 of the real weight of the boat.

A more accurate calculation for windy conditions takes into account the area of sailing. If you plan to fish in the wind 5-7 m / s, the weight of the anchor should be increased by 30-50% of the base value. For a boat 320 cm the base value in calm is considered to be a weight of 3-4 kg, but when the wind is strengthened to 10 m / s, it may take 5-6 kg.

It is important to understand that retainer The anchor depends not only on its mass, but also on the angle of attack of its paws. If the anchor lies on the bottom and stretches horizontally, it holds 10 times better than if it hung vertically. Therefore, having a quality anchor cable and the right length (the anchor line should be 3-5 times more depth) is more important than adding an extra kilogram of lead.

Types of anchors and their effectiveness for PVC

The market offers many designs, but for an inflatable boat 320 cm is not all suitable. The main criteria for choosing: compactness in folded form, the absence of sharp edges that can damage cylinders, and sufficient weight.

Cat anchor Its paws fold, allowing it to be compactly placed in a bag of things or even in a special pocket on a cylinder. For a boat 320 cm optimal models weighing 2-4 kg. The big plus is versatility: the cat holds well on stones, grass and driftwood.

Cargo anchors (mushrooms, stockings) They are a massive load without paws. Their holding power depends solely on weight and friction on the bottom. For a boat 320 cm this option is suitable only for very calm water, because to keep the boat in the wind, the load must be very heavy (more than 6-8 kg), which is inconvenient for transportation.

• 🦀 Hall anchor: Excellent holding capacity on soft soils, but has protruding parts that can damage the balloon if handled carelessly.
• ⚓ Denforth anchor: Compact and effective on the sand, but requires strictly horizontal tension of the cable, which is difficult to provide in a short parking lot from a boat.
• 🪨 Mushroom anchor: Ideal for a muddy bottom where it is "sucked up," but useless on hard rocky soil.

⚠️ Note: When using sharp paw anchors (Holl, Denforth), be sure to use a protective cover made of dense fabric or rubber when transported inside the boat to avoid accidental puncture.

For owners of PVC boats 320 cm is also relevant anchorageThis allows you to fold a heavy 4-5 kg anchor into a small bag, sacrificing the reliability of threaded joints for compactness.

Practical recommendations for installation and use

The proper organization of anchorage begins with the choice of the anchoring of the verlug. On PVC boats 320 cm most often the anchor flounder is attached to the nose handle or to the ring welded on the cylinder. It is important to understand that you can not attach the anchor strictly in the center of the nose or stern if the side wind blows, the boat will turn on board to the wave, which is fraught with a revolution.

The optimal attachment scheme for safety is to use two anchors (a rotating anchor) or shift the anchor point closer to the side (leeward side) so that the boat lags to the wind, but does not turn over. However, for most anglers, this is unnecessarily difficult, so they use a simple mount on the nose to monitor the direction of the wind.

The length of the anchor cable is critical. To operate the anchor efficiently, the angle between the cable and the bottom should be minimal (ideally less than 10 degrees), achieved by using a cable 3-4 times the depth of the parking lot, using a short, vertically stretched cable will tear out any, even the heaviest anchor.

The material of the cable also matters. nylon cord It is preferable to chains, because it is lighter, does not rust and, most importantly, is able to stretch, cushioning the jerks of the boat on the wave. The chain, although it helps the anchor to lie down better on the bottom, in an inflatable boat 320 cm creates an extra load on the cylinders and takes up a lot of space.

Table of conformity of anchor weight to conditions

For quick orientation, we offer a summary table that will help you choose the weight of the anchor depending on the operating conditions of the PVC boat with a length of 320 cm The data are averaged and suggest the use of a paw type anchor (cat, Hall).

Weather conditions	Wind power (m/s)	Recommended weight of anchor (kg)	Type of bottom
Stile/Weak wind	0 - 5	2.0 - 3.0	Anybody
Moderate wind	5 - 10	3.5 - 4.5	Sand, silt, grass.
Strong wind	10 - 14	5.0 - 6.0+	Clay, stone (with caution)
Current (medium)	-	+30% by weight	Hard.

The table shows that the universal solution for a boat 320 cm is an anchor weighing 4 kg. It will allow you to feel comfortable in winds up to 8-9 m / s, which covers 80% of fishing situations.

What if the anchor is stuck?

If the anchor is in rocks or snags, don't pull the boat abruptly. Swim to the staging point, pick a slack of the cable, make a loop around a duck or a ring, and slowly back up, changing the angle of thrust, often helping to free your paws.

Security and frequent errors

One of the most common and dangerous mistakes is to tie the anchor end to the arm or leg. When a boat jerks sharply (for example, when passing a boat or a gust of wind), the inertia of a heavy anchor at the bottom can lead to injury or even pulling a person under the water. ring-ring Or ducks on the hull of a boat.

Another mistake is using a cable that's too short. Fishers are often lazy to unwind 10-15 meters of cord at a depth of 2-3 meters, considering it unnecessary. As a result, the anchor hangs vertically and at the slightest effort flies out of the ground, leaving the boat drifting. Remember: the horizontal component of the tension force is the main friend of the anchor.

Also worth mentioning is the problem of dead anchors, if you use cat anchors on a heavily loaded bottom, you're at risk of getting stuck forever. jack-boat Or tie the anchor to the top (top line), so that when stuck you can pull the back end and free your legs.

Alternative solutions and modern gadgets

With the development of technology, alternatives to classical anchors have emerged. PVC boats 320 cm, which are often used for trolling or fishing in the coastal zone, are popular. electric anchorThese are devices that are a screw in a protective casing that is screwed into the ground by a motor, which is compact but requires a power source (battery), which increases the overall weight of the gear.

Another option is inflatable anchors, which are cone-shaped bags of fabric that fill with water and create tremendous resistance, and they don't keep the boat at one point, they just slow down the drift, which is ideal for trolling, but useless for stationary fishing.

In conclusion, there is no one right solution for a 320 cm boat, depending on your fishing style, the water body and personal preferences, but by balancing weight, anchor type and cable length, you will ensure a comfortable and safe fishing experience in all conditions.

Frequently Asked Questions (FAQ)

Can I use a chain instead of a cable for anchor on a PVC 320 boat?

The chain is heavy, can damage cylinders when hitting the side and does not cushion jerks. It is better to use the 0.5-1 meter chain between the anchor and the main synthetic cable, so that the anchor better lies on the bottom, and the rest is made of nylon or polypropylene.

What is the maximum weight of the anchor safe for an inflated boat 320 cm?

Safe is considered weight, which does not deform the cylinders during storage and does not create a dangerous gap. For a boat of 320 cm, you should not use anchors heavier than 6-7 kg, since with a careless throw they can penetrate the bottom. The optimal limit is 4-5 kg.

Do I need to lubricate the anchor before storage?

After each fishing, the anchor must be washed with fresh water, dried and lubricated with oil or a special lubricant (such as WD-40 or lithium lubricant) to prevent corrosion that will quickly destroy the metal.

Why does the anchor not hold the boat even at high weight?

The problem is probably the length of the cable or the type of soil, so if the cable is pulled vertically, the anchor will pull out, and the cat anchor can slide over smooth clay or rocks without getting caught, and in these cases, it helps to increase the length of the cable or change the parking lot.