Operating a swimming facility without a reliable means of stopping often turns into endless and tedious drifting in the wind or current. Homemade anchor for inflatable boat It's not just a way to save money, it's also a way to create the kind of cargo that's perfect for your vessel and the water. Many owners of inflatable PVC designs find that store options are either too heavy to transport or have a shape that can damage a delicate cylinder if handled carelessly.
Making an anchor yourself allows you to take into account all the nuances, from the type of bottom where you plan to fish, to the way you attach the falt. PVC-boat The shape of the legs and sharp corners must be taken into account to minimize the risk of puncture, and the correct weight and ergonomic design will make the anchoring process fast and safe, even in windy weather.
In this article, we will look at time-tested circuits, weight calculations, and step-by-step instructions for building a reliable containment device, which metals are best handled in garage conditions, and how to avoid the typical mistakes made by beginners when designing marine nodes.
Selection criteria and anchor requirements for PVC boats
The first and most important parameter in design is the weight, which must correspond to the displacement of the boat. There is a generally accepted rule that the mass of the anchor should be approximately 10% of the carrying capacity of the boat, but for the purpose of the boat, the weight of the boat is not limited to the weight of the boat. squirrel-stuff This is often adjusted downward because of space constraints and payloads, and too heavy a load will be uncomfortable to lift, and too light will not hold the boat in place when the wind is amplified.
The second critical aspect is the shape of the paws and the presence of sharp protruding parts, and PVC rubber is a durable material, but vulnerable to point impacts and friction. Homemade structures should not have sharp edges or welds directed outward, as when lifting the anchor may hit the side. The ideal shape should provide quick engagement on the ground and easy separation from it when jerking for the fall.
⚠️ Note: The use of anchors with sharp angles without protective linings on inflatable boats is strictly not recommended, since the risk of puncture of the balloon in the wind reaches 80%.
Also worth considering is the fabrication material. Cast iron is fragile and when hit by rocks it can split, steel is corrosive, and lead is too soft but great for weighting. metal-mark It depends on how often you plan to operate the product and in which water bodies (fresh or salty) fishing will take place.
Calculation of the required weight of the anchor
To prevent a boat from becoming an unruly sailboat, you need to accurately calculate the weight of the cargo. Insufficient weight will lead to the anchor simply dragging along the bottom without getting hooked, and the excess will create problems with storage and safety. Below is a table of the dependence of the mass of the anchor on the length of the swimmer, which will help to navigate the choice of parameters.
| Boat length (m) | Min. anchor weight (kg) | Optimal weight (kg) | Type of bottom |
|---|---|---|---|
| 3.0 | 3.0 | 4.0 | Il, sand. |
| 3.0 - 3.5 | 4.0 | 5.0 | Sand, clay |
| 3.5 - 4.0 | 5.0 | 6.0 | Clay, stone |
| 4.0 | 6.0 | 8.0+ | Any type |
It's worth noting that these values are relevant for classic paw anchors. cat-anchor Or a structure with a higher adhesion coefficient, the weight can be reduced slightly, but in the course or in the case of a strong side wind, it is better to have a mass reserve to keep the weight in the air. fella He was in a state of tension.
Also consider the length of the anchor tile, for each meter of depth, there must be a certain number of meters of cable, usually a ratio of 1:4 or 1:5. If the tile is too short, the angle of attack of the paws on the ground will become ineffective, and the anchor will not be able to properly burrow, regardless of its weight.
Design of the anchor Denforth himself
One of the most popular and efficient designs for small boats is the Denforth anchor, which has the advantage of having a high retention force at relatively low weight, making it an ideal candidate for a small boat. homemadeThe design is a flat frame with two movable or fixed paws, which, when falling to the bottom under the action of thrust, crash into the ground.
You'll need 4-5 mm thick sheet steel to make it, spindle rounds, and paw spin axis bushings. The process starts with cutting out the main elements according to the drawing. The paws must have a pointed front edge for better penetration into the silt or sand. It's important to ensure that the parts are symmetry so that the anchor falls to the bottom predictably.
The construction requires attention to movable joints. The axis on which the paws are attached must be securely fixed, but must not prevent their free passage at the initial moment of falling. The lower part of the frame is often weighted with lead to shift the center of gravity and ensure the correct position of the anchor on the ground.
⚠️ Note: When welding thin sheet steel, use a minimum current so as not to burn the metal and not to disturb the geometry of the paws, which will lead to a decrease in efficiency.
The finished product must be cleaned of scale and rust, then covered with an anti-corrosion composition. For a inflatable boat, the sharp edges of the legs are recommended to be slightly dulled or equipped with rubber linings to prevent damage to the cylinder during careless loading.
Manufacture of cat anchor from fittings
The cat anchor is a classic that is simple in design and versatile. rubber-boat The best fit is a folding modification, where the legs can be pressed against the central rod, which significantly reduces the dimensions of the device in the transport position, allowing it to be compactly placed in a funduk.
The base is a central stem made of thick reinforcement or pipe, and the bottom of the stem is welded with a rope attachment ring, and the top with a movable coupling, and the legs are made of curved rods that hinge to the stem, and when you lower the legs, they diverge to the sides, and when you lift them behind a special ring, they press to the center.
☑️ Checklist for anchor-cat assembly
The weight of this structure is gained by the thickness of the metal used or by pouring concrete cargo into the bottom, concrete allows you to get a heavy anchor with less metal consumption, which is economically profitable, but the concrete must be protected from water, otherwise the reinforcement inside quickly rusts and loses strength.
The main advantage of a cat is that it can catch on to almost any kind of bottom irregularity, like snags, rocks, algae, but it also has a downside: it's a very frequent anchor. bumble-knot or an additional uncoupling rope to free the stuck load.
Cast anchors and use of lead
If you have access to a smelting furnace, the best solution is to cast lead anchors, which are very dense, so you can create compact and heavy loads, and you can cast lead anchors in any shape, like a pear or a cone, so you can minimize the risk of damage. boatside contact.
The casting is made from a gypsum or a sand-clay mixture, and inside the mold is a steel fixture or hook that will serve as the basis for the mounting of the falt, and the molten lead is poured into the mold, and after cooling, it becomes a monolithic product, often called "fungal" anchors because of their characteristic shape.
Safety technique for smelting lead
Work should be done only outdoors or in a well-ventilated area, use a respirator and gloves, and prevent water from entering the molten metal to avoid the explosion of steam.
The advantage of cast structures is that there are no welds that can be sharp; the surface of the lead is smooth enough, and the material is inert to water and does not rust. The only disadvantage is that lead is soft, and when hit by stones, the paws can deform, so they are often reinforced with a steel core.
These anchors are ideal for sludge or sandy bottoms, where they burrow quickly and deeply. On rocky ground, their effectiveness is lower, because the smooth shape does not give a reliable hook, and the anchor can simply slide over the surface of the bottom sediments.
Fail materials and fastening techniques
The reliability of the anchor system depends not only on the cargo itself, but also on the quality of the vehicle. anchor-failInflatable boats are strongly discouraged from using chains, as they are heavy and can damage the transom or cylinders when boltanka. The optimal choice is a synthetic cable made of polyamide or polypropylene with a diameter of 8-10 mm.
Polyamide cords have the ability to stretch under load, which works as a shock absorber when boats snatch on the wave. Polypropylene is cheaper and does not sink in water, which makes it easier to find and lift, but it is less durable and more prone to abrasion. The length of the foil should be with a margin, usually 30-50 meters for most bodies of water.
Always use a vertebra between the anchor and the phalanx to prevent the rope from twisting, especially if the boat will stand in the wind for a long time and change position.
Mounting the thal to the anchor should be done by a reliable node, for example, "bulin" or using a kowsh and a clamp. The end of the thal, which is in the boat, should be attached to a special rump bolt on the transom or nose. To throw anchor from the hand, holding the phala wound on the wrist, is strictly forbidden. - with a sharp jerk, this can lead to serious injury or even a person's passion overboard.
It is convenient to use a special coil or bag to keep the tangle from getting tangled, and order on the deck is a guarantee of safety, especially when you need to quickly remove the anchor when another vessel approaches or weather changes.
Security and storage rules
Operating a homemade anchor requires certain rules to avoid turning fishing into a rescue operation. Always check the condition of the cable before going out: scuffling, incisions or weakening of the knots can cause the anchor to lose at the most inopportune moment. Regular inspection of equipment should become a habit.
When lifting the anchor, try to choose it vertically up, choosing the slack of the phala. If the anchor is firmly entrenched, do not try to pull it at the limit of strength - it is better to go to the point of engagement, if depth allows, and release it manually. Using a detachment device greatly simplifies this process and saves nerves.
Safety on the water is above all else: properly secured and selected anchor is a guarantee that your boat will not be carried away by the current or wind.
The anchor should be stored in a dry place, after washing it with fresh water, especially after use in a salt water body. Metal parts should be lubricated with oil or special lubrication to prevent corrosion. Folding structures are stored in a separate bag in a disassembled or folded form so that the sharp parts do not damage other equipment.
Can I use a stone anchor for a inflatable boat?
The stones have sharp, unpredictable edges that are guaranteed to damage PVC upon contact. If there is no other way out, the stone should be carefully packed in a dense bag or mesh, but the effectiveness of such an anchor will be low due to poor aerodynamics and shape.
Which node is best for anchoring?
The most reliable and simple node is considered to be the "Fisherman's knot" or "Boulin" (a squat knot) if you want to make a non-tightening loop. To attach to the squat anchor, a straight node with control ends or special carbines with a clutch that excludes spontaneous unty under vibration is often used.
Do I need to paint a homemade anchor?
Painting is mandatory for steel structures, it protects the metal from rapid corrosion, which can weaken the structure and stain equipment with rust, use special metal and enamel primers for external work that are resistant to water and mechanical damage.
What if the anchor is stuck dead?
If the usual methods of lifting do not help, try to change the angle of thrust by getting the boat closer to the place of the hook or, conversely, bypassing it in a circle. If there is a thaw, use it. In extreme cases, if the anchor is not of high value, you can leave it by pre-marking the coordinates to try retrieve later with a more powerful means.