*gear reduction unit

[fhhhstix]

Joe we put 5 55turn motors on my dyno and they ranged from 4800-5900 rpm. Instead of running the dyno with a 12 power supply and regulating the dyno to 7.2v we ran the dyno with 2 of my good NiMH 7.2v batteries which give a better reading. We ran all 5 motors on one battery and then did it again with the other battery. The 12v power supply is fine to break in a motor but using a battery pack will give you a better reading of the motor this is how we used to do it for our race cars.

[CustomRCmodels]

Originally Posted by fhhhstix

Joe we put 5 55turn motors on my dyno and they ranged from 4800-5900 rpm. Instead of running the dyno with a 12 power supply and regulating the dyno to 7.2v we ran the dyno with 2 of my good NiMH 7.2v batteries which give a better reading. We ran all 5 motors on one battery and then did it again with the other battery. The 12v power supply is fine to break in a motor but using a battery pack will give you a better reading of the motor this is how we used to do it for our race cars.

CAT-man
What dyno do you use ?
A typical 55 turn motor should have around 8000 rpm’s with zero timing .
Your readings look like readings you get on a dyno with a internal stabilized 5 volt supply , no matter what you connect to it .

Here are my test-results from 2002
Comparing my own WWR-Truckpuller vs the LRP Truckpuller ( 55 turn vs 80 turn )


and here my WWR-Truckpuller vs stock Mabuchi 540 ( 55 turn vs 27 turn )


here you can read my write up from back then :
http://www.customrcmodels.com/id442.htm