<p>Assuming all other variables stay the same, yes, The Kv should scale with voltage completely linearly. There are some other changes in the electrical system due to the voltage change that have some impact on efficiency, but when Kv is changed along side voltage, that is largely mitigated. Based on the tests we've run and comparing the resulting data on the <a href="https://www.miniquadtestbench.com/motor-explorer.html" rel="nofollow noreferrer">Mini Quad Test Bench motor explorer</a> efficiency is usually within a couple percent if you scale Kv properly. If you got to crazy extremes you might see a bit more variation, but I don't have data at those extremes. For most practical applications you can assume a linear relationship.</p>

CC BY-SA 4.0
2020-05-27T19:27:37.797Z
2020-05-27T19:27:37.797Z
QuadMcFly
<p>Yes. KV scales with voltage. If you want to have the equivalent motor battery combo going from 3s to 2s you would scale the motor Kv by 3/2. This holds true true for all BLDC motors.</p>

CC BY-SA 4.0
2020-05-27T13:54:27.600Z
2020-05-27T13:54:27.600Z
Luca Scheuer
<p>There have been myriad questions regarding motor KV, such as <a href="https://drones.stackexchange.com/q/49/50">this one</a>. Many of these come close to answering my question, however none have given me a definite answer.</p>

<p>If I am picking motors for a build, will the motor KV required scale linearly with voltage?</p>

<p>For example, if I know that for a 3” build on 3S (11.1V) I will need 3000KV motors, to find the required KV for similar motors to spin the same propeller on 2S, would I multiply the KV by 3/2, giving me a KV if 4500? If so, does this hold true for larger motors as well?</p>

<hardware><brushless-motors><motor>
Does motor KV requirement scale linearly with voltage?
Drones and Whatnot
# Does motor KV requirement scale linearly with voltage?

(Asked by: username_0 on 2020-05-27)

There have been myriad questions regarding motor KV, such as [this one](https://username_0.stackexchange.com/q/49/50). Many of these come close to answering my question, however none have given me a definite answer.

If I am picking motors for a build, will the motor KV required scale linearly with voltage?

For example, if I know that for a 3” build on 3S (11.1V) I will need 3000KV motors, to find the required KV for similar motors to spin the same propeller on 2S, would I multiply the KV by 3/2, giving me a KV if 4500? If so, does this hold true for larger motors as well?

**Tags:** hardware, brushless-motors, motor


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## 2 answers

### Answer by username_1 on 2020-05-27. Score: 3

Assuming all other variables stay the same, yes, The Kv should scale with voltage completely linearly. There are some other changes in the electrical system due to the voltage change that have some impact on efficiency, but when Kv is changed along side voltage, that is largely mitigated. Based on the tests we've run and comparing the resulting data on the [Mini Quad Test Bench motor explorer](https://www.miniquadtestbench.com/motor-explorer.html) efficiency is usually within a couple percent if you scale Kv properly. If you got to crazy extremes you might see a bit more variation, but I don't have data at those extremes. For most practical applications you can assume a linear relationship.


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### Answer by username_2 on 2020-05-27. Score: 1

Yes. KV scales with voltage. If you want to have the equivalent motor battery combo going from 3s to 2s you would scale the motor Kv by 3/2. This holds true true for all BLDC motors.


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