**Calculate your motor: **

**Please note:** The calculation only
yields an approximate choice.

Instructions for use

For this choice please provide the following three measures:

- Operating voltage (under load with the current given below)
- Operating current (maximal continuous)
- Rpm (under load with the current given above)

Example

Desired data:

- Racing boat (Drifter M) with 24 cells (GP 3700) - operating voltage is ca. 25 V
- Run time ca. 5 min - average current 45 A - max continuous current 90 A*
- Speed ca. 100 km/h - rpm 30,000

Result: Motor 2250 with 10 windings (2250/10)

* The maximal continuous current for racing boats is approximately twice the average calculated. (This is a result of the interval mode – full power on the straight legs / half power in curves – has been determined by telemetry measurements.) This value is very important for the optimal motor choice.

The thus determined continuous current of 90 A should also be used to select the proper controller current.