How to FPV motor thrust-to-weight ratio calculations: A Comprehensive Guide

In the world of FPV (FPV motor thrust-to-weight ratio calculations) flying, the performance of the motor is crucial. One important metric to consider when selecting a motor is the thrust-to-weight ratio (TWR). TWR is the ratio of the thrust generated by the motor to the weight of the aircraft. A higher TWR indicates a more powerful motor, which translates to better acceleration and maneuverability. In this article, we will discuss how to calculate TWR for FPV motors and what factors to consider when choosing a motor with a suitable TWR.

Section 1: What is Thrust-to-Weight Ratio (TWR) and Why is it Important?

  • Definition of TWR and its significance in FPV flying
  • Relationship between TWR, acceleration, and maneuverability

Section 2: How to Calculate TWR for FPV Motors

  • Formula for calculating TWR
  • Steps for measuring motor thrust and aircraft weight
  • Example calculation

Section 3: Factors to Consider when Choosing a Motor with Suitable TWR

  • Importance of TWR in different types of FPV flying (racing, freestyle, etc.)
  • Effects of TWR on flight time and battery life
  • Relationship between TWR and motor efficiency
  • Trade-offs between TWR, motor size, and weight
  • Considerations for multirotor vs fixed-wing aircraft

Section 4: Popular FPV Motor Models and Their TWR

  • Comparison of TWR for popular FPV motor models
  • Factors affecting TWR for different motor models
  • Pros and cons of different motor models based on TWR


What is thrust-to-weight ratio?

Thrust-to-weight ratio is the ratio of the maximum thrust generated by the motor to the weight of the aircraft. It is a measure of the aircraft’s ability to accelerate vertically, climb, or maintain altitude.

How do you calculate thrust-to-weight ratio?

To calculate thrust-to-weight ratio, you need to divide the maximum thrust generated by the motor by the weight of the aircraft. The formula is: Thrust-to-weight ratio = Maximum Thrust / Weight of the Aircraft

What is the ideal thrust-to-weight ratio for an FPV drone?

The ideal thrust-to-weight ratio for an FPV drone depends on its purpose and configuration. Generally, a thrust-to-weight ratio of 2:1 or higher is recommended for agile acrobatic flying, while a ratio of 1:1 or slightly higher is sufficient for stable and smooth flying.

How can I improve the thrust-to-weight ratio of my FPV drone?

There are several ways to improve the thrust-to-weight ratio of an FPV drone. You can upgrade to a more powerful motor, use a higher pitch propeller, reduce the weight of the aircraft by using lighter components, or increase the battery voltage to provide more power to the motor.

What are the implications of having a low thrust-to-weight ratio?

A low thrust-to-weight ratio can result in poor performance of the FPV drone, such as slow acceleration, difficulty in climbing, and reduced flight time. It can also increase the risk of crashes and damage to the aircraft due to inadequate power for control during flight.

Conclusion: The TWR of a motor is a critical factor to consider when selecting a suitable motor for FPV flying. By understanding how to calculate TWR and the various factors affecting TWR, pilots can make more informed decisions when choosing a motor for their aircraft. It is also important to consider the trade-offs between TWR, motor size, and weight to achieve optimal performance.

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