# ESC calibration guide

Source: https://forum.modalai.com/topic/1533/esc-calibration-guide
Category: ESCs, Sensors and Accessories (https://forum.modalai.com/category/15/escs-sensors-and-accessories)
Tags: esc
Posted: 2022-11-09 10:52:48 UTC by Tamas Pal 0
Replies: 3 · Views: 1690

## Tamas Pal 0 · 2022-11-09 10:52:48 UTC

Do I have to keep the propeller attached with motors while calibrating the modalai v2 Rev B esc?
These are the instruction from modalai team 
```
## Calibrate ESC
- wear safety glasses
  - make sure the propeller is clear of any obstacles and there are no items that can become airborne due to high air flow
- calibrate the ESC's feed-forward curve
 - ```python voxl-esc-calibrate.py --id 0 --pwm-min 10 —-pwm-max 95```
  - this will step the motor through a range of power from 10% to 95%

```

## Reply by Chad Sweet (ModalAI staff) · 2022-11-09 17:35:47 UTC

yes, you need the propellers installed to calibrate the motor+propeller RPM curve

## Reply by mbahrami · 2022-11-15 14:18:36 UTC

@Chad-Sweet Is there any alternative method for calibrating the VOXL 4-in-1 ESC v2 that does not require the propellers being installed as opposed to the [VOXL ESC Tools](https://docs.modalai.com/modal-esc-v2-manual/#voxl-esc-tools) ?

## Reply by Chad Sweet (ModalAI staff) · 2022-11-15 17:14:02 UTC

Without propellers you are not calibrating the ESC