How to Determine the Horsepower of a Trolling Motor

Determining the exact horsepower of a trolling motor can be a tricky task, as there’s no direct translation from electrical power to horsepower. However, there’s a method to estimate the horsepower rating of an electric motor by calculating the wattage. By multiplying the amp draw by the voltage, you can find the wattage of the motor. And by dividing this wattage by 746, you can obtain an approximate estimate of the horsepower. While this method may not provide an exact measurement, it can certainly help you gauge the power of your trolling motor and make informed decisions accordingly.

How Much Horsepower Does a Trolling Motor Have?

When it comes to trolling motors, their power is typically measured in terms of thrust rather than horsepower. This is because thrust is a more accurate way to measure the actual force that a trolling motor can exert in the water.

To compare thrust and horsepower, it’s important to understand that they aren’t directly interchangeable measurements. While horsepower measures the overall power output of an engine, thrust specifically measures the force that a trolling motor can generate to move a boat through the water.

Ultimately, the appropriate trolling motor size for your boat will depend on various factors such as boat size, weight, and the desired level of power. It’s essential to carefully consider these factors and consult with the manufacturers recommendations to ensure you choose a trolling motor with sufficient power to meet your specific needs.

The Difference Between Horsepower and Thrust and How They Relate to Trolling Motors.

  • Horsepower and thrust are two different measurements in the context of trolling motors.
  • Horsepower refers to the unit of power, commonly used to measure the motor’s overall strength.
  • Thrust, on the other hand, refers to the force that propels the boat forward.
  • Trolling motors generate thrust by rotating a propeller, which pushes water backward, thereby propelling the boat forward.
  • The amount of thrust generated by a trolling motor is directly related to it’s horsepower.
  • Typically, trolling motors with higher horsepower ratings will produce more thrust, resulting in greater speed and better maneuverability.
  • However, it’s essential to note that other factors, such as the boat’s weight and design, can also influence the overall performance of the trolling motor.
  • When selecting a trolling motor, it’s crucial to consider both horsepower and thrust to ensure it meets the specific needs of your boat and desired usage.

As the thrust power of a trolling motor increases, so does it’s speed potential. With a 36, 46, or 40lb thrust trolling motor, expect a speed of approximately 3.5 miles per hour on a 7.5-foot boat carrying a 200-pound load in calm waters. However, opting for a 55lb thrust motor can yield around 4 miles per hour, while a 62lb thrust motor can push the speed up to approximately 4.5 miles per hour.

How Fast Does a 40lb Trolling Motor Go?

The speed of a trolling motor is determined by it’s thrust rating, which measures how much power it can deliver. For a 40lb thrust trolling motor, on a 7.5-foot boat carrying a 200-pound load, the average speed on calm water is estimated to be around 3.5 miles per hour. This speed may vary slightly depending on other factors such as wind and current.

If you’re looking for a slightly faster option, a 46lb or 55lb thrust trolling motor would be more suitable. With a 46lb thrust motor, the average speed would be similar to the 40lb thrust motor, reaching around 3.5 miles per hour. However, upgrading to a 55lb thrust motor can provide a slightly higher speed of around 4 miles per hour under similar circumstances.

With it’s increased power, this motor can reach speeds of approximately 4.5 miles per hour on a 7.5-foot boat carrying a 200-pound load on calm water. Again, it’s important to note that environmental factors may slightly affect the actual speed achieved.

It’s worth mentioning that these speed estimations are based on ideal conditions and may vary depending on the size, shape, and weight of your boat, as well as other external factors such as wind, waves, and water currents. Additionally, the battery life and efficiency of the motor can also have an impact on speed.

Ultimately, the choice of a trolling motor should take into consideration your specific needs and preferences. Understanding the thrust rating and it’s corresponding speed can help you make an informed decision to ensure a comfortable and efficient boating experience.

In the world of physics and engineering, the term horsepower is a unit of power that measures the rate at which work is done. It provides a valuable way to understand and quantify the force required to move an object. To grasp the relationship between thrust and horsepower, it’s crucial to recognize that each pound of thrust can be equated to one horsepower at a speed of 550 feet per second. This measurement sheds light on the intricate interplay between force and power, showcasing how they contribute to the movement of objects.

How Many Pounds of Thrust Equal 1 Horsepower?

The concept of horsepower and thrust are closely related when it comes to measuring power and force. One horsepower is equivalent to 550 foot-pounds per second.

Thrust, on the other hand, is a force that propels an object forward. It’s commonly used to describe the force produced by engines, particularly those in aviation or rocketry. The amount of thrust generated by an engine directly affects the speed and acceleration of the object it’s propelling.

It’s worth noting that this conversion is based on certain assumptions and constant factors. While it provides a straightforward way to relate thrust and horsepower, it may not be a precise measurement in all cases due to various factors, such as efficiency losses, friction, or the specific design of the engine or propulsion system.

Source: How many pounds of thrust equals horsepower? – Quora


By calculating the wattage of the motor, derived from the amp draw multiplied by the voltage, and then dividing this value by 746, a reasonable approximation of the motor's horsepower can be obtained.

Scroll to Top