Selection of craft electric-power It's not just about buying an engine, it's about a complete engineering solution where every single detail affects the ultimate autonomy. trolling motorBut the physics of the process dictates its own rigid conditions, and the weight of the hull, its contours and the hardness of the bottom, all of which determine how much time you can spend on the water without recharging.
The modern market offers many solutions, from lightweight frames to heavy aluminum boats. Efficiency of electric motor It drops sharply if the boat is over-displaced or hydrodynamically poor, which is why the question of choosing a pair of "hull-engine" becomes critical for comfortable operation.
In this article, we will discuss all the nuances that will help you avoid disappointment. slipper For PVC and aluminum, it differs dramatically, and how it affects power choices.
Case materials: PVC vs. Aluminium
The first thing that the future owner of a quiet course faces is the dilemma of choosing the material. Inflatable boats PVC is popular due to its transportability and low price, but they have a high sailing and soft bottom.
When the electric motor is running soft tannery It can bend under the weight of a lower unit, which leads to a loss of efficiency of the propeller's stop, and the water starts to walk under the bottom, creating additional resistance.
Aluminum boats lack this drawback. turret The weight of the metal, however, requires a more powerful traction to break off.
⚠️ Warning: When installing a heavy electric motor on an inflatable boat, be sure to use transom wheels or additional inflatable balloons to compensate for the stern different.
There is a compromise option - boats from the Hypalon They're tougher than classic models, but they're still less durable than metal when they're used on rocky shores.
Calculation of the required traction and power
The main mistake of beginners is to buy a motor “back to back”. Electric motor traction (measured in pounds or kilograms) must exceed the minimum required for your weight with a margin of 30-40%, which will allow the motor to operate at optimal mode without overheating.
For the calculation, use a simple rule: for every 500 kg of total weight (boat + fisherman + equipment + battery), approximately 40-50 pounds of thrust are required for a comfortable movement against the wind.
If you're planning to fish on the current or in windy weather on a large body of water, the formula changes. capacity It is a critical factor in survival and the ability to return to base.
Always round up the design power in a big way. A motor running at 60-70% of its power will live much longer than a unit running at its limit.
It is important to consider not only static traction, but also currentA powerful motor at low speed can be more efficient than a weak full-thrust motor, but only if the screw is chosen correctly.
Translation design and installation of lower unit
The quality of the engine installation determines 50% of the success. lower unit (motor leg) will vibrate or have a backlash, the efficiency of the screw will fall to zero. For aluminum boats, weld brackets, drawn behind the aft cut, are ideal.
In the case of PVC boats, use only rigid squirt-board Plywood at least 18-20 mm thick, thin plywood will quickly dissipate from the vibration and weight of the battery.
The height of the installation also plays a role: the screw should be immersed in the water completely, but the lower unit should not create unnecessary resistance. The optimal depth is 15-20 cm from the surface of the water to the anti-cavitation stove.
☑️ Checking the engine installation
And don't forget to protect against corrosion, even if the motor is electric. fixture must be stainless steel or have a zinc coating, especially in salt water.
Power system: Batteries and charging
The heart of your boat is not a motor. batteryLead-acid (GEL, AGM) options are cheap and reliable, but heavy and fear deep discharge.LiFePO4) the batteries are 2-3 times lighter and give currents more stable.
When choosing a capacity, focus on the real, not advertising range. If the manufacturer promises 8 hours, feel free to divide by 1.5 for real conditions with wind and current.
The most important element of the system is BMS (Battery Management System)It protects the cells from overcharging, which can instantly kill an expensive battery.
| Type of AKB | Weight (conditionally 100 Ah) | Life cycles | Price. |
|---|---|---|---|
| Lead-acid | ~30 kg | 300-500 | Low. |
| AGM / GEL | ~28 kg | 500-700 | Medium |
| LiFePO4 | ~10 kg | 2000+ | High. |
| Li-Ion (18650) | ~12 kg | 1000+ | High. |
⚠️ Warning: Never charge lithium batteries below 0C without special heating, this leads to irreversible damage to the chemistry of the cells.
Use smart chargers with a multi-stage algorithm to charge, and they will determine the saturation phase and go into storage mode, which will prolong life. electrolyte or cells.
Screws and hydrodynamics
The staff rotor is often a compromise solution. Replacing the propeller is the cheapest way to do it. tuningFor heavy boats and low speeds, screws with a large pitch and diameter are needed.
The material of the screw is also important. Plastic screws bend when impacted, but they are easy to replace. Stainless steel or bronze is more effective, but when hitting a stone can damage the shaft of the motor.
The optimal speed for trolling is 3-5 km / h. At this speed hydrodynamic resistance The minimum, and the energy consumption is most efficient, and trying to swim faster dramatically increases the flow rate of amps.
The secret to saving energy
Use three-blade propellers for maneuverability and two-blade propellers for maximum traction at low rpm. Experiment with the shape of the blades.
Control and navigation
Modern electric motors are equipped with systems GPS anchorsThe boat holds its position above the point, using a screw to compensate for the wind demolition, which frees the fisherman's hands.
Having a foot pedal or a wireless remote makes it intuitive. You don't have to reach for the gas handle when your hands are busy with tackles.
Integration with mapploter allows you to build routes and automatically pass them. Autopilot A feature that turns a regular boat into a smart fishing tool.
The GPS anchor system is not just a toy, but the ability to fish in the wind where with a conventional anchor it would be impossible due to noise or depth.
Frequent questions and services
Regular maintenance prolongs the life of the machine. After every fishing, especially in salt water, you need to wash the lower unit with fresh water.
Lubrication of seals and check of condition of osteoils should be carried out once a season. gearbox Motor failure is a common cause of motor failure.
Keeping a battery in a cool environment in the winter is a charge (about 60-70%), and a deep discharge in the winter is detrimental to any chemistry.
Do I need to register a boat with an electric motor?
In Russia, boats with an electric motor up to 5 hp (about 1.8 kW) and weighing up to 200 kg in running order are not subject to registration in GIMS. However, the rules may change, check the current legislation.
What speed does a boat with an electric motor develop?
The average cruising speed is 5-7 km / h. The maximum speed rarely exceeds 10-12 km / h due to the limitations of the efficiency of the screw on planing and battery capacity.
Can I use an electric motor on the current?
Yes, but the energy consumption will increase by 2-3 times. For rivers with strong currents (more than 2-3 km / h), the engine thrust reserve is at least 50% of the relatively calm water.
How to store the battery in winter?
The best place is a dry room with a temperature of +10... + 15 ° C. Once every 2-3 months, check the voltage and, if necessary, recharge to 100%, then again discharge to 60-70%.