The KV value is the speed the motor needs to turn in order to offer 1V of counter-electromotice force. A real world motor is not always 100% efficient though. Given the wide range of possible battery configurations, you want to choose a motor with a KV rating that can optimize the performance of your RC model. This app lets you quickly choose a rating that can achieve your desired performance in rpm.
This version is for input with NIMH cells.
https://fingertainment.itch.io/rcpress-kv-rpm-calculator-nimh
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