Quietly sliding across the water on oars is a classic, but even the most avid rower sometimes dreams of just resting while keeping his speed running. kayaking It turns a lightweight tourist boat into a full-fledged small boat that can travel long distances without physical fatigue, and modern technology allows you to equip even a narrow single boat with a power unit without compromising its stability and driving performance.
Before I go to the store for electric motor or petrol-poweredYou need to understand the challenges that your vessel will be solving, whether it's fishing in overgrown shallow waters, where silent passage is important, or long-distance passages in reservoirs, where you need a range. traction And competent fastening - the guarantee that your kayak will not turn into an uncontrollable toy on the waves.
In this article, we will look at all the nuances of modernization, from the choice of engine type to the final tuning of the transom. kayak And how to avoid tipping over in a sudden start, and a holistic approach to the question will allow you to enjoy the water, rather than deal with technical problems.
⚠️ Attention: Installing the motor on a light kayak dramatically changes its center of gravity. Always conduct your first test runs in a life jacket and in the vicinity of the shore to feel the behavior of the vessel under load.
Engine Types: Electricity vs. Gasoline
Choice between electric and petrol The motor is the first and most important dilemma faced by the owner of a kayak: electric models such as the popular series. Min Kota or HaswingThey are attractive for their environmental friendliness, low noise and ease of maintenance, and are ideal for fishing, where the surges and smell of exhaust fumes can scare off all the fish.
Gasoline units, for example, two-stroke Tohatsu or Yamaha The main advantage of this is that it's not so much power, but it's limited to the size of the fuel tank, and the weight of the engine and the need to mix gasoline with oil are often the decisive arguments against installing them on lightweight inflatable or plastic kayaks.
- ⚡ Electric motors: Quiet, lightweight, do not require a HIMS (often), but depend on the battery.
- ⛽ Gasoline engines: powerful, autonomous, but noisy, heavy and require regular maintenance.
- 🔋 Battery dependence: For an electric motor, the battery weight (AGM or LiFePO4) can be up to 70% of the total weight of the equipment.
There are also laws to be considered. electric motors Power up to a certain horsepower (usually up to 5-10 hp, but the rules change) does not require registration of a vessel unless the total power exceeds thresholds, making them legally more attractive to small craft owners who want to avoid bureaucracy.
⚠️ Warning: When using a gasoline engine on an inflatable kayak, make sure the exhaust jet is not directed at cylinders. Hot gases can damage the PVC or Hypalon material, leading to depressurization.
Calculation of the required traction and power
The wrong power is either wasted money or the frustration of slow driving. For kayaks that have a narrow body and low sailing, you don't need huge power. traction (for electric motors) and horsepower Overloading the engine can cause the kayak's stern to go underwater and the nose to linger, making it impossible to operate.
There is a simple formula for an approximate calculation: for every 30-40 kg of total weight (boat + fisherman + equipment + battery), approximately 1 pound of thrust (1 lb) is required to move comfortably into calm. If you plan to walk against the current or wind, this ratio should be increased.
Pay special attention to the weight of the entire structure. Light kayak length of 3-4 meters with one passenger weighs about 120-140 kg. For this weight, an electric motor with a thrust of 30-40 lbs (about 0.5-0.7 hp) or a gasoline engine 2 hp Installation of a more powerful unit will require strengthening the transom, which will add extra pounds.
| Total weight (kg) | Recommended traction (lbs) | Analogue of L. S. (gasoline) | Type of kayaking |
|---|---|---|---|
| 100 kg | 20-30 lbs | 0.5 to 1.0 hp | Single, lightweight |
| 100 - 150 kg | 35-45 lbs | 1.5 - 2.0 hp | Single with cargo / Double with cargo |
| 150 - 200 kg | 50-60 lbs | 2.0 - 3.0 hp | Double, expeditionary |
| 200 kg | 70+ lbs | 3.0 - 5.0bhp. | Heavy, heavy, heavy. |
For kayaks, it rarely makes sense to put a motor more powerful than 3-4 hp, since a narrow body simply will not be able to use this power effectively and will begin to burrow its nose in the wave.
Methods of fastening the motor: transom and hinged
The most difficult technical question is pin Baidark boats, unlike traditional boats, often don't have a hard transom. prairieIt's important that the transom is rigid and not bend under the weight of the motor, otherwise the propeller will work in the air.
Plastic and composite kayaks often use removable transom boards that are inserted into the slots or attached with bolts. There is also an option to install the motor on the remote. outrigger It's a catamara tank, which increases stability but increases the size of the boat, and the choice of method depends on the design of your boat and the frequency of the assembly.
- 🔩 The hinged transom: universal solution for PVC, fastened by straps-belts, requires the presence of weights.
- 🪑 Seat anchorage: rare option, the motor is placed behind the seated, suitable only for very light electric motors.
- ⛓️ Chain anchorage: The motor is suspended on chains around the stern, requires protection of the body from grinding.
☑️ Checking trans-transe anchorage
When installing, you must use dumper-layer The vibration from a running motor, even an electric one, can wipe the fabric or paint in a few hours, and if you're using a gasoline engine, make sure that the height of the installation allows the propeller to dive into the water to the right depth, but the spray does not fly into the cockpit.
Power Supply: Battery Selection
The heart of any electrical system is batteryStandard lead-acid batteries (AGM, GEL) are heavy and fearful of deep discharge, but they are cheap. For a kayak where every kilogram counts, this can be critical. The 12V and 100Ah battery weight can reach 30 kg, which is a significant part of the light boat's carrying capacity.
The modern alternative is Lithium-Iron-Phosphate (LiFePO4) They weigh 2-3 times less lead at the same capacity and allow almost complete discharge without loss of life. Despite the high initial cost, their lifespan is 5-10 times higher, making them almost completely discharged. most cost-effective solution In the long run, it is for an active tourist.
Keep in mind that it's tight. Even if the battery is in a plastic box, water or rain can get in through vents or loose contacts. Use special sealed boxes with power connectors out. It's also important to securely lock the battery in the nose or center of the kayak for balancing, because the engine at the stern creates a lever that heels the vessel.
⚠️ Warning: Never leave a lithium battery in the direct sun in hot weather inside a closed sealed box. Overheating can lead to irreversible chemical reactions and failure of the BMS board.
Control and navigation
The motor kayak requires a motor remodeling. pulp It's very important to adjust the angle of the crank so that you can sit flat without slouching. electric motors have a retractable foot pedal, but on a narrow kayak it can be uncomfortable due to lack of leg space.
In low visibility conditions (especially in the evening) lights and reflectors are required. If the motor is powerful and allows speeds of more than 7-9 km / h, safety requirements increase. GPS trackers or navigation apps on a smartphone in a sealer to track the path traveled and the remainder of the charge in percentage.
The secret to saving charge
Use top speed only to overcome areas against the current or wind. Keep 30-40% of the power in calm water, which is the optimal efficiency mode for most electric motors, allowing you to travel 20% longer distance.
In windy weather, a kayak with the engine raised turns into a sail. If the wind blows into the side, the boat will be heavily demolished. anchor Or paddle with your motor folded down (if the design permits), remember that driving at low speeds is less efficient, so always have a thrust reserve for maneuver.
Safety and maintenance
Regular maintenance extends the life of the motor. electric motors This is primarily a check of contacts for oxidation and a flush with fresh water after use in salt water, and shaft bearings require periodic lubrication, especially if you often walk in shallow water where sand and silt enter the water.
Gasoline engines require a more serious approach: replacing candles, checking fuel hoses and using a fuel stabilizer for long-term storage. On a kayak where space is limited, the smell of gasoline can be intrusive, so keep the canisters only in special sealed containers in the nose, away from the passenger.
- 🧼 Washing: After each exit to salt water, dip Daydvet into a container with fresh water and let the engine work for 2-3 minutes.
- 🔋 Charging: Never keep batteries completely discharged, this leads to plate sulfation (for AGM) or voltage drop below the BMS turn on threshold (for LiFePO4).
- 🔧 Puff: Before each exit, check the tightening of all the bolts of the mounting of the transom and motor, as vibration weakens the connections.
Carry a spare cut pin (for gasoline engines) and a tape. On a kayak, a break away from the shore can be a serious problem, and the tape will temporarily help fix the loose connection.
FAQ: Frequently asked questions
Do I need to register a kayak with a motor in GIMS?
In most cases, if the weight of the kayak is less than 200 kg and the engine power is less than 8 kW (about 10.8 hp), registration is not required. However, the rules may change, and electric motors often have separate weight regulations.
How long does the electric motor last on a single charge?
The operating time depends on the battery capacity and the selected speed. At maximum thrust, the 100Ah battery can discharge in 1.5-2 hours. At an economical speed (30% of power), the reserve will last for 6-8 hours of continuous running, which is approximately 25-30 km.
Can I put the motor on a kayak without a transom?
Yes, there are universal mounts that are fixed on the sides or the seat, but they are less reliable. The best solution is to order or make a removable transom of plywood or dural that will be attached to the hose of the inflated boat, which will provide the necessary rigidity for the efficient operation of the screw.
Which screw is better: two-bladed or three-bladed?
For low-power kayaks with low speed, two-blade or larger pitch propellers are often better suited, vibrate less and work more efficiently at low speeds, and three-blade propellers are smoother, but may require more power to unwind.