Owners of inflatable boats with low pressure inflatable floor (LDP) are constantly faced with a dilemma: where to place gear, tools and personal belongings, so that they do not get confused under the feet and do not spoil from moisture. Runduk It becomes not just an accessory, but a vital element of comfort, transforming the chaotic cockpit space into an organized work area. Unlike plywood piola boats, where you can use the space under the seats, NDNDM dictates its own rigid conditions in terms of weight and load distribution.
Incorrectly selected or installed box can disrupt the balance of the boat, creating a roll or making the walker uncomfortable. Moreover, cheap models often do not cope with aggressive environment: splashes of salt water, direct sunlight and constant vibration quickly disable poor-quality fittings. In this material, we will analyze the nuances of the choice of ready-made solutions and the features of creating a new model. custom-munk It will fit perfectly into the geometry of your boat.
It is important to understand that The tightness of the runduk in the NDND boat directly affects the buoyancy of the vessel in an emergency situation.Because the closed air can be an extra compartment, but you don't have to rely on that, because the main function is to organize storage, and a good approach to the location of the installation will allow you to avoid tripping over the boxes during active fishing or during abrupt changes in the weather.
Criteria for the selection of material and design
The first thing to look at when looking for or designing a box is the material of the case. The market offers solutions in marine aluminum, fiberglass, moisture-resistant plywood and various polymers. AMGThey are highly durable and lightweight, but require high-quality anodizing or painting to avoid corrosion in drilling sites. HDPE (Low Pressure Polyethylene)They are completely inert to water and chemistry, but can deform in strong sun if the wall thickness is not large enough.
The design of the lid is critical to protecting the contents, and it needs to open smoothly, not to slam into the wind, and have a reliable locking mechanism. Often, gas shock absorbers or chain limiters are used, but for small boats with NDNDT, where every gram counts, it is better to choose light stainless steel hinges with a position lock. Tightness This is achieved by using a sealing profile around the perimeter of the cover, which, when pressed, creates a water-repellent barrier.
The shape of the bottom of the runduk is also important to consider when choosing. For boats with an inflatable floor, it is critical that the bottom of the box does not have sharp corners or roughness that can damage the cylinders when driving. The ideal solution is a rounded or flat bottom with a soft lining. The weight of the empty container should not exceed 10-15% of the maximum load capacity of the boat, so as not to "plant" the transponder and not impair driving performance.
⚠️ Attention: The use of conventional construction plywood without high-quality epoxy treatment or coating with carbide in conditions of constant contact with water will lead to stratification and rotting after one season of active operation.
When buying a finished harunduk, be sure to check the quality of the welds (if metal) or gluing the corners. Even a microscopic crack will become a hotbed of corrosion or leakage.
Comparative table of the main materials for the manufacture of runduks:
| Materials | Weight. | Resistance to water | Strength | Difficulty of manufacture |
|---|---|---|---|---|
| Marine aluminum | Low. | Tall (covered) | Very high. | High (welding required) |
| Fiberglass | Medium. | Absolute. | High. | Medium (shape required) |
| Phanera FC/FSF | Highly | Requires processing | Medium | Low. |
| Polyethylene (HDPE) | Medium. | Absolute. | Medium | High (needs heating) |
Ergonomics of accommodation in the boat of NDND
Low-pressure inflatable floor boats have a unique architecture where cylinders are often narrowed in the bow and extended in the stern. placing a runduk in the nose can be problematic due to the small width of the cockpit, so the most popular solution is to install a cockpit. feed-duck This arrangement allows you to save the passage to the nose and does not interfere with the operation of oars or electric motors if you use it.
The height of the box also matters. If you make it too high, it will block the view and interfere with rowing. The optimal height is considered to allow the lid to be used as an additional seat for the fisherman or passenger. To do this, the upper lid must be reinforced with stiffened ribs and withstand the weight of a person in winter clothing, which can reach 120-130 kg.
When installing multiple modules, it is important to provide access to balloon inflating valves and drain plugs. Nothing should overlap these elements, since in an emergency situation the count is only seconds.
The interior space also requires organization, and randomly abandoned gear will rattle and interfere, and it's advisable to install removable plastic trays inside, or divide the volume into sections using partitions, so that you can quickly find the right tool or bait without going through a bunch of things.
Self-manufacturing: drawings and calculations
When you make a handmade hazelnut, you have a unique opportunity to tailor it to a particular boat model, starting with accurate measurements of the cockpit, drawing a hand-drawn sketch, noting all the curves of the cylinders and the position of the stringers, and then creating a detailed drawing that takes into account the thickness of the material on the walls and the lid.
For the classic version of plywood or composite, the optimal dimensions for a boat with a length of 3.2-3.6 meters will be approximately 800x400x350 mm. Such proportions allow you to get a sufficient volume (about 100 liters) and at the same time leave room for the legs. If aluminum is used, the walls can be made thinner, which will increase the internal useful volume with the same external dimensions.
The assembly process requires precision and technology. When working with plywood, all the ends must be carefully glued and skinned. Aluminum structures are assembled on corners or welding, and then they are necessarily sanded. Pay special attention to the attachments of hinges and locks, which are the ones that experience maximum load.
☑️ Stages of creating a runduk
Remember to provide drainage holes at the bottom, unless the kunduk is going to be completely sealed, so that water that gets in when you open the lid on the wave, will leak out on its own without turning the box into a water tank. The holes should be protected by a net from debris.
Furniture and attachment systems
The quality of the fittings determines the life of the product, cheap Chinese hinges rust after the first time out on the water, and locks wedge from the sand. stainless steel AISI 316 Or high-quality silumin with protective coatings, and it is better to choose hinges with a bearing or sleeve to ensure smooth running even after prolonged use.
The system of attaching the harunduk to the floor of the boat is a separate topic. In NDND boats, you can't just screw the box to the bottom. You use special straps (belts) that run under the stringers, or guides that are inserted into pockets on the cylinders. Also popular are dad-mama mounts, where the response part is fixed on the floor of the boat, and the kunduk is snapped on top.
Latch locks must have a locking mechanism so that the lid does not open on the bump. Toggle latches with rubber seals have proven themselves. If the knob is used to store valuables, it makes sense to consider the possibility of installing a small hinged lock.
⚠️ Warning: Never use conventional nails or screws screwed directly into cylinders or bottoms to attach a PVC knob to a PVC boat, which will result in depressurization and loss of warranty.
For ease of use, you can fit the inside of the lid with pockets of grid or elastic holders for fishing rods, which will turn the lid into a full-fledged organizer, allowing you to keep frequently used trifles at hand, but in order.
Protection against moisture and condensation
Even the most sealed hazelnut is susceptible to condensation due to temperature changes in water and air. Moisture inside the box can spoil dry clothing stocks or cause corrosion of metal tools. To combat this phenomenon, it is recommended to sheath the inside with foil insulation, which works as a thermal and reflects heat.
In addition, you should place silica gel bags or special moisture absorber tablets inside, they must be periodically dried or changed. If the kunduk is not sealed in design (it has drainage), then the condensate problem is solved by natural ventilation, but then things must be packed in sealants.
The sealing profile around the perimeter of the lid should be soft but elastic. The optimal use of a rubber profile of a D-shaped or P-shaped section is glued to the skimmed surface with a special rubber glue. It is important that when the lid is closed, the profile is compressed by about 30-40%, ensuring close contact.
How to check the tightness of a runduk at home?
Put a dry napkin or a piece of paper inside, close the lid tightly and lower the structure into a bath of water (or pour it out of a hose abundantly). If the paper is dry after extraction, the sealability is excellent. If it is wet, look for loosenesses in the corners or around the hinges.
Regular care of seals will prolong their life. Once a season, it is recommended to wipe the rubber with a protective silicone lubricant, which prevents the material from drying out and cracking under the influence of ultraviolet light.
Maintenance and winter storage
Proper operation of the harunduk extends its lifespan. After each trip to the water, especially saltwater, you need to rinse the outer surfaces with fresh water. The salt, when dried, forms crystals that can damage the paintwork or accelerate the corrosion of the metal.
For winter storage, the hazelnut should be removed from the boat if possible and left with the lid open, which will ensure air circulation and prevent mold and musty odor. If the box is not removable, leave it ajar and put a moisture absorber inside.
Periodically check the condition of fasteners and hinges. loose bolts should be tightened, rusted bolts should be replaced. Lubrication of moving parts (hinges, locks) should be carried out with special lubricants that do not corrode plastic and rubber, for example, silicone or Teflon compounds.
Regular maintenance and proper wintering of the runduk increase its service life by 2-3 times, maintaining an aesthetic appearance and functionality for many years.
Compliance with these simple rules will allow your kunduk to remain a reliable assistant on any journey, keeping your belongings dry and in order regardless of the swimming conditions.
Frequently Asked Questions (FAQ)
Can I use a knuckle as a seat in a NDND boat?
Yes, most modern PVC boat handles are designed to be an adult weight (up to 150 kg), but it is important to make sure that the lid is reinforced with stiffness ribs and the box is securely secured so that it does not shift under the weight of the seater.
What is the optimal volume of a harunduk for a boat 3.5 meters long?
For a boat of this size, the optimal volume is 60 to 90 liters, which is enough to accommodate a life jacket, anchor, and a supply of food and personal belongings, while the box does not occupy more than 20% of the useful area of the cockpit.
Do I need to make drainage holes in a sealed runduk?
In a fully sealed runduk that is used as a buoyancy compartment, drainage holes cannot be made, and if the runduk is only for storage and is not designed to create an air cushion, one or two small holes at the bottom point will help avoid water accumulation inside.
What is the best way to fasten the knob to the inflatable floor?
The best way is to use regular boat mounts or special belts, passed under stringers. Hard coupling to the floor (adhesive) is not recommended, since the bottom of the NDNDM should be able to deform when pressure and temperature change.
Will the john damage the inflatable floor during a long parking?
If the bottom of the harunduka is smooth, without sharp protrusions and burrs, and the weight is evenly distributed, then there will be no damage. For additional security, you can put a piece of dense fabric or a special mat under the harunduka, especially if the boat is long in the sun.