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sikeston34m
RC-Monster Brushless
 
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Join Date: Sep 2007
12.14.2008, 08:03 AM

Hi Jalodo,

You've chosen some very good parts to put into your E maxx. Sounds like it's going to be a great build.

There is a sticky at the top of the Brushless forum called Speed Calculator. With it, you can figure gearing for just about anything. A Very smart man named Brian, came up with it for us all to use.

I plugged your information into it and here's what it had to say.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.8333333333333334
Other Ratio: 1
Spur Tooth Count: 72
Pinion Tooth Count: 17
Total Voltage: 22.2
Motor KV: 1600
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 4.24 : 1
Total Ratio: 22.09955 : 1
Tire Circumference (inches): 18.06 inches (458.83 mm)
Total Motor Speed: 35520 RPM
Vehicle Speed: 27.49 mph (44.17 km/h)
Estimated Adjusted Speed: 27 mph (43 km/h) - 3% loss
Effective KV Value: 1600

In my opinion, this setup is undergeared.

I am currently running a MMM and the Medusa 36-60-1500kv with 18/40 gearing in an E Revo. It does well on 4S, 5S, or 6S. On 6S, it will get a little warm. That's why I have a heat sink/fan on the motor.

I hope this helps.
   
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