Choosing an electric motor for a boat is not just about buying equipment, it's about making a strategic decision that affects the comfort, autonomy and maneuverability of your boat. electric motor It provides silent motion, which is critical for fishing or nature watching, and a properly designed power plant will allow you to enjoy the water for hours without the fear of a sudden stop due to lack of energy.
The modern market offers a huge variety of models, each of which has its own technical nuances. day-woot Every detail plays a role in the final performance, and a miscalculation can cause the boat to fail to glid or be overweight.
In this article, we will look at all aspects of the choice, from the calculation of traction to the selection of the battery. pound-traction It's more important than horsepower, and how to pay for unnecessary functions, and a competent approach to buying will save you money and nerves on the water.
Key specifications of traction electric motors
The first thing that customers encounter is specific units of power, and in the world of electric outboard motors, they rarely use kilowatts or horsepower, preferring them to power. thrustOne pound of thrust is approximately 0.45 kg of force, making it easy to convert values to understand the capabilities of the motor.
The second most important variable is the operating voltage, and most models run from 12 volts, but powerful units can require 24 or even 36 volts, which directly affects the battery circuitry and the overall overall battery connection. energy efficiency The higher the voltage, the lower the current at the same power, which reduces the heating of the wires and energy loss.
⚠️ Warning: Never connect a 12-volt motor to a 24-volt battery, guaranteed to cause the control board and engine windings to burn in fractions of a second.
It is also worth paying attention to lower unit Aluminum alloys are lighter, but composite materials are often stronger when hit by rocks or driftwood, and the length of a lower unit should match the height of your boat, so that the screw is always underwater, but does not create unnecessary resistance.
- 🔋 Voltage: Determines the type of battery and connection scheme (sequential or parallel).
- ⚓ Traction: The main power characteristic that affects speed and ability to go against the wind.
- 🌊 The length of the lower unit: Must be selected strictly under the height of the transom or fastening on the nose.
Calculation of the required traction and power
To figure out which motor you want, you need to make simple but important calculations. There is a golden rule: for every 45-50 kg of total weight of the boat (including passengers, cargo, the boat itself and the engine), it takes 1 pound of thrust, which is a basic guide for a calm passage.
However, if you plan to walk against the current, strong winds or use a flat-bottomed boat that creates a lot of water resistance, the power reserve should be increased, in such cases the ratio can rise to 1 pound per 25-30 kg of weight. Excess capacity It is better than the lack of it, because the engine will not work at the limit of its capabilities.
☑️ Calculation of the parameters of the boat
It is also important to consider the shape of the body. catamarans And the broad flat bottom boats require more energy to overcome the wave drag than the narrow keel boats, and if you're in doubt between the two, always choose the one that's more powerful, but that can work at low speeds.
| Total weight of the boat (kg) | Min. traction (lbs) | River. traction (lbs) | Voltage (B) |
|---|---|---|---|
| 500 kg | 30-40 lbs | 45-55 lbs | 12 V |
| 500 - 900 kg | 55-60 lbs | 70-80 lbs | 12-24 V |
| 900 - 1400 kg | 80-100 lbs | 110-130 lbs | 24-36 V |
| more than 1,400 kg | 130+ lbs | 150+ lbs | 36-48 V |
Remember that the manufacturer's stated maximum thrust is achieved only at full speed. In real trolling mode, you will only use 20-30% of the power, so you will not be able to get the power to the top of the system. Engine efficiency At low speeds, it plays a huge role in the length of the walk.
Types of electric motor control
Control ergonomics is something you interact with every second you're on the water, and there are three main types of control: tiller, foot (pedal) and remote. tiller It's a classic version where the motor handle rotates and adjusts the gas, which is reliable and cheap, but requires constant presence at the motor.
Foot control, or Foot ControlIt's perfect for fishing. You control your course and your foot's speed, leaving your hands free for tackle. These systems often have force sensors: push harder, speed faster. It's addictive, but it's incredibly comfortable.
Secrets of foot control
Many anglers don't know that the pedals can be adjusted to the left or right leg, and modern systems have a "return" function, where the pedal itself returns to neutral when released, preventing a sharp jerk of the boat.
Remote control through radio-module Or a smartphone becomes the standard for large boats, and you can be anywhere on the boat, which is convenient for maneuvering at the dock or fishing from different sides, and some models support integration with mapplotters, allowing you to follow the specified GPS points.
- 🎮 tiller: Direct control, low price, reliability in all conditions.
- 🦶 Pedal: Free hands, high accuracy trolling, requires a place in the cockpit.
- 📡 Distance: Maximum freedom of movement, convenient for large crews.
Screw and lower unit systems
The propeller is the heart of the propulsion system, which converts the rotation of the shaft into motion. Electric motors are characterized by the use of screws with a large pitch and diameter, which allows you to operate efficiently at low revs. Two-bladed screws Usually quieter and less vibrating, but three-blades provide better traction at low speeds.
The material of the propeller also matters. Plastic composites, when hit by a rock, often just break down, saving the engine shaft, but they're easy to replace. Metal screws are stronger, but can transfer the impact load to the gearbox. Removable propeller - a mandatory option that allows you to quickly replace the damaged blade in the field.
⚠️ Warning: When changing the screw, always check the condition of the coils and the presence of grass or fishing line on the shaft. Even a small piece of fishing line can wind and squeeze the oment, causing water to enter the gearbox.
Today's lower unit motors often have telescopic designs or the ability to adjust the sinking, which allows you to optimally adjust the position of the screw relative to the bottom of the boat, minimizing water vortex and cavitation. keynote to achieve maximum speed and save battery power.
To improve efficiency, install a fairing (hydrofol) over the propeller on the transom, which will improve the planing of the boat and reduce energy consumption by 10-15%.
Selection of battery
The electric motor is useless without a good power source. Standard car starter batteries are not suitable for long-term operation, because they are designed for short-term high-current return. traction Deep Cycle, capable of withstanding multiple cycles of discharge and charge.
The most popular lead-acid batteries are AGM and GEL, which are sealed, safe and relatively inexpensive, but they are heavy and limited in life to 500-800 cycles.LiFePO4) batteries have revolutionized the market: they are 3 times lighter, have a life of 3000+ cycles and give full capacity even at a strong discharge.
When calculating capacity, use the formula: the desired stroke time (hours) multiplied by the average current (ampers). The average current can be found from the engine manufacturer's tables. Always lay a margin of 20-30%, because capacity The battery falls at low temperatures and high discharge currents.
| Type of AKB | Weight (at 100 Ah) | Life cycles | Price. |
|---|---|---|---|
| Liquid electrolyte | ~25 kg | 200-300 | Low. |
| AGM / GEL | ~28 kg | 500-800 | Medium |
| LiFePO4 | ~10 kg | 3000+ | High. |
Installation and maintenance on water
Installation of the electric motor requires attention to detail. When mounted on a trawler, make sure that the rod does not damage the material of the boat; for PVC, use special protective linings. The fastening should be rigid, without backlashes, since vibration can destroy the material of the boat. transomb over time.
Electric motor maintenance is minimal, but necessary. After each release, especially in salty or muddy water, the motor should be rinsed with fresh water, regularly lubricate the moving parts of the rotary mechanism and check the tightening of the screws of the mounting. Silicone lubricant It is great for rubber seals.
The main enemy of the electric motor is not water, but sand and dirt stuffed into the glands. Regular pressure washing (with caution) will prolong the life of the engine at times.
Store the motor in a dry room, preferably in an upright position, so that the oil from the gearbox does not leak through the glands. Before long winter storage, it is recommended to remove the screw, clean the shaft and lubricate it with a consistent lubricant. This will prevent corrosion and jamming.
Frequently Asked Questions (FAQ)
Can an electric motor be used in salt water?
Yes, many models are corrosion-resistant and are made of salt-resistant materials, but after use in seawater, the motor must be thoroughly washed with fresh water to prevent corrosion of metal parts and oxidation of contacts.
What is the maximum speed of an electric boat?
Speed depends on the weight of the boat, the shape of the hull and the power of the engine. On average, electric motors reach speeds from 5 to 10 km / h. For planing light PVC boats, powerful models from 80-100 lbs of thrust are required.
How long does the motor last from a single battery?
The battery life varies from 2 to 8 hours or more. At minimum rpm (trolling) the charge is enough for the maximum time; at full power, the battery can run out in 40-60 minutes. The exact time depends on the battery capacity in Ampere hours.
Do I need to register a boat with an electric motor?
In accordance with the legislation of the Russian Federation (at the time of writing), boats with an electric motor up to 3.68 kW (5 hp) and a length of less than 20 meters do not require registration in the GIMS, if their weight in running order does not exceed 200 kg.