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SpEEdyBL · 08:47 PM

It may be necessary to consider rpm drop of the motor under a load in the calculations.

RPM drop of the motor (per amp) is the unloaded kv x the resistance. Rpm drop will always be the same no matter what voltage. Ex. a 5000 kv motor with .006 ohms will drop by 30 rpm per amp. So if you're running it at 7 volts and it's drawing 20 amps, it will have 34400 rpm. At 1 volt and 20 amps, it will have 4400 rpm.

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SpEEdyBL "Out of spec" enthusiast Offline Posts: 820 Join Date: May 2005	02.09.2006, 08:45 PM It may be necessary to consider rpm drop of the motor under a load in the calculations. RPM drop of the motor (per amp) is the unloaded kv x the resistance. Rpm drop will always be the same no matter what voltage. Ex. a 5000 kv motor with .006 ohms will drop by 30 rpm per amp. So if you're running it at 7 volts and it's drawing 20 amps, it will have 34400 rpm. At 1 volt and 20 amps, it will have 4400 rpm. Check out my custom converted 8ight: Sub 7lb, lowest CG of any 1/8 buggy http://www.rc-monster.com/forum/show...894#post367894 Area 52 Ranch Raceway T.R.C.R. Last edited by SpEEdyBL; 02.09.2006 at 08:47 PM.