<p>The RC Rates are just the multiplicator value the Aircraft will try to execute your inputs. The resulting speed (degrees/sec) are just estimates based on a typical hardware configuration, without a major effort, as this is very much dependent on the conditions the aircraft is in, the way the execution is carried out, and the hardware that actually does it.</p>
<p>As an example, an RC rate resulting in 500degrees/sec a 5&quot; quad with 4 motors will be significantly faster than a 500degree/sec setting on a 10&quot; quad or on an aircraft that uses mechanical elements to execute directional changes.</p>
<p>As another example: with a high Super rate resulting in the same mathematical 500degrees/sec a larger Quad will turn faster because of the momentum it creates, so timing is an issue as well.</p>
<p>That's why you set the RC/Super/Expo rate multiplier instead of the rate itself.</p>

CC BY-SA 4.0
2021-06-21T04:34:14.280Z
2021-08-12T05:05:52.140Z
2021-08-12T05:05:52.140Z
Nullx8
<p>If the axes of the gyro sensor are aligned with the <a href="https://en.wikipedia.org/wiki/Aircraft_principal_axes" rel="nofollow noreferrer">aircraft principal axes</a>, then yes, the gyro data will correspond to the roll/pitch/yaw rates, of course after transforming the gyro value range to degrees. And of course like all sensor data the measurement contains noise and probably a, hopefully small, bias. If the axes are not oriented correctly, the measured values of the gyro axes must be transformed into to aircraft coordinate system.</p>

CC BY-SA 4.0
2021-08-10T22:45:12.687Z
2021-08-10T22:45:12.687Z
juliusd
<p>As per the title, I want to understand if the roll rate/pitch rate/yaw rate are same as the data obtained from mpu9250 gyro sensor along y-axis, x-axis and z-axis?</p>
<p>If not then how to calculate roll rate/pitch rate/yaw rate from MPU9250.</p>
<p>Thanks</p>

CC BY-SA 4.0
2020-12-08T21:09:36.310Z
I'm not sure what you mean by this; could you describe an instance in which the two wouldn't be identical values?
ifconfig
CC BY-SA 4.0
2020-12-11T21:43:48.440Z
I think you should read carefully the manual of the MPU9250
here: https://invensense.tdk.com/products/motion-tracking/9-axis/mpu-9250/
Dave
<sensor><imu>
Is roll rate, pitch rate and yaw rate same as gyro data along y-axis, x-axis and z-axis
TheLazy
# Is roll rate, pitch rate and yaw rate same as gyro data along y-axis, x-axis and z-axis

(Asked by: username_0 on 2020-12-08)

As per the title, I want to understand if the roll rate/pitch rate/yaw rate are same as the data obtained from mpu9250 gyro sensor along y-axis, x-axis and z-axis?

If not then how to calculate roll rate/pitch rate/yaw rate from MPU9250.

Thanks

**Tags:** sensor, imu

> **Comments:**
> **username_1**: I'm not sure what you mean by this; could you describe an instance in which the two wouldn't be identical values?  
> **username_2**: I think you should read carefully the manual of the MPU9250 here: https://invensense.tdk.com/products/motion-tracking/9-axis/mpu-9250/  

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## 2 answers

### Answer by username_3 on 2021-06-21. Score: 1

The RC Rates are just the multiplicator value the Aircraft will try to execute your inputs. The resulting speed (degrees/sec) are just estimates based on a typical hardware configuration, without a major effort, as this is very much dependent on the conditions the aircraft is in, the way the execution is carried out, and the hardware that actually does it.

As an example, an RC rate resulting in 500degrees/sec a 5" quad with 4 motors will be significantly faster than a 500degree/sec setting on a 10" quad or on an aircraft that uses mechanical elements to execute directional changes.

As another example: with a high Super rate resulting in the same mathematical 500degrees/sec a larger Quad will turn faster because of the momentum it creates, so timing is an issue as well.

That's why you set the RC/Super/Expo rate multiplier instead of the rate itself.


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### Answer by username_4 on 2021-08-10. Score: 0

If the axes of the gyro sensor are aligned with the [aircraft principal axes](https://en.wikipedia.org/wiki/Aircraft_principal_axes), then yes, the gyro data will correspond to the roll/pitch/yaw rates, of course after transforming the gyro value range to degrees. And of course like all sensor data the measurement contains noise and probably a, hopefully small, bias. If the axes are not oriented correctly, the measured values of the gyro axes must be transformed into to aircraft coordinate system.


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