Motors keep spinning fast after lowering throttleUpdated 2 months ago

If your FPV drone motors continue spinning quickly after lowering the throttle, especially while testing without propellers installed, this is often normal Betaflight behavior and does not automatically mean the drone is defective.

This is very commonly reported when:

• arming the drone on the bench,
• testing indoors without propellers,
• raising throttle briefly and lowering it again,
• or holding the drone while armed.

In most cases, this is caused by Betaflight Air Mode and active PID stabilization behavior.

Always remove all propellers before troubleshooting or bench testing.

This is usually not the correct way to test the drone

Many customers believe they should test the drone by:

• arming it normally,
• raising throttle,
• and checking how the motors react without propellers.

This is generally not recommended.

When a drone is armed normally, Betaflight stabilization, gyro corrections, PID control, and Air Mode are active. Without propellers installed, the flight controller cannot receive the normal aerodynamic feedback expected during actual flight.

As a result:

• motor RPM may increase unexpectedly,
• motors may continue spinning fast after throttle is lowered,
• motors may spin at different speeds,
• or the drone may appear unstable on the bench.

This behavior is commonly called “motor windup” during bench testing and is well known in Betaflight-based FPV systems.

Why this happens

Betaflight Air Mode keeps PID control active even at very low or zero throttle to maintain flight stability and control during actual flight.

Without propellers:

• the motors create almost no stabilizing force,
• the gyro still detects vibration and movement,
• the flight controller tries to compensate,
• and motor RPM may continue increasing even after throttle is lowered.

This does not automatically mean:

• the ESC is defective,
• the throttle is stuck,
• the receiver is faulty,
• or the drone will fly incorrectly.

Many FPV drones behave very differently on the bench compared to real flight conditions.

The correct way to test motors

Motors should normally be tested individually in the Betaflight Motors tab instead of by arming the drone and applying throttle.

In Betaflight:

1. Open the Motors tab
2. Remove all propellers
3. Confirm “I understand the risks”
4. Test motors individually at low RPM

The Motors tab is designed specifically for:

• motor direction checks,
• motor order checks,
• ESC testing,
• and controlled low-speed motor testing.

Avoid:

• full throttle without propellers,
• long motor runs without load,
• or repeated arming tests on the bench.

Do not run motors at high RPM without propellers for long periods

Running motors at high RPM without propellers for extended periods is not recommended.

Possible risks include:

• motor overheating,
• ESC stress,
• motor bearing wear,
• excessive vibration,
• and abnormal motor RPM without load.

Bench testing should always be short and controlled.

Do not hold the drone while armed

Holding the drone while armed can make the behavior worse.

The flight controller interprets movement as instability and may continue adjusting motor speed while trying to stabilize the drone.

This may result in:

• unexpected RPM changes,
• motors spinning faster than expected,
• injury risk,
• or possible motor and ESC stress.

Never hold an armed drone in your hand.

Air Mode is commonly enabled by default

Many Betaflight setups enable Air Mode by default because it improves control during actual flight, especially during:

• freestyle flying,
• flips,
• dives,
• and low-throttle maneuvers.

Air Mode itself is not a defect.

Disabling Air Mode only for bench testing is usually unnecessary and may negatively affect flight behavior later if forgotten.

When this may indicate a real problem

The behavior may indicate an actual problem if:

• motors immediately go to maximum throttle uncontrollably,
• the same issue happens during real flight,
• throttle cannot be reduced during actual flight,
• motors twitch randomly while disarmed,
• or Betaflight reports runaway or ESC-related errors.

Possible real causes include:

• incorrect motor direction,
• wrong propeller orientation,
• wrong motor order,
• incorrect flight controller orientation,
• ESC desync,
• PID or filter configuration problems,
• hardware damage,
• or incorrect firmware/configuration.

If the same issue occurs during actual flight with propellers installed, stop flying immediately and inspect the setup carefully.

Before contacting support

Please collect:

• Order number
• Drone model
• Betaflight version
• Short video of the behavior
• Whether propellers were installed
• Whether Air Mode is enabled
• Whether the issue also happens during actual flight
• Screenshots of the Betaflight Configuration and Motors tabs

Contact our support team at:

[email protected]