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Old 12-20-2010, 03:36 AM   #1
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Default KV rating wtf lol

hey guys. i been around rc cars for a fair wile now. so im used to ranking motors in turns and rpms.

so wats the deal with this kv rating. i need to kno how to convert kv to turns or rpm so i can find a decent speedy to run my 5.5 turn brushless and the 2.5 i have at work lol
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Old 12-20-2010, 03:52 AM   #2
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multiply the kv X (Volts) you are applying to the motor for the RPM
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Old 12-20-2010, 09:36 AM   #3
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2.5 and 5.5 turn motors will need a beefy ESC to run them.
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Old 12-20-2010, 10:26 AM   #4
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Kv ratings tell you how many revolutions per minute you get for a given voltage and nothing else!

For example a weak rotor motor my have a very high Kv rating but not be able to drive higher gearing. A strong rotor motor my have a lower Kv rating but be able to drive higher gearing.

Also different motors have different amounts of timing built in which also effects the Kv output massively.
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Old 12-20-2010, 11:47 AM   #5
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Also, the Kv ratings are usually given without added motor timing, and also with no load (free reving). Not a lot you can tell from Kv, other than what "class" the motor is.
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