this cant be right?!
 

hi guys,

while im waiting for my MMM combo to arrive, i thought i'd punch in my specs into the speed calculator, and i was shocked to find out that it would be going at about 70mph!
surely this cant be right?!

http://www.scriptasylum.com/rc_speed/_top_speed.html

Enter Front/Rear Differential Gear Ratio (?): 2.8461538461538462
Enter Transmission Gear Ratio (?):1.8333333333333332
†† Enter Additional Gear Ratio (?): 1
Enter Spur Gear tooth count (?): 65
Enter Pinion Gear tooth count (?): 24
* Enter total battery voltage (?): 22.2
Enter kv rating of brushless motor (?): 2200
Enter tire diameter in inches (?): 5.9
†† Enter the added radius of tire
"ballooning" in inches (?): 1
Enter Current draw in amps (?): 120
Enter motor resistance in Ω (?): 0.006
Enter vehicle type (?): Monster Truck

Spur/Pinion Reduction Ratio (?): 2.71 : 1
Total Reduction Ratio (?): 14.13194 : 1
Tire Circumference (?): 24.82 inches (630.39 mm)
Total Motor Speed (?): 47256 RPM
Theoretical Maximum Vehicle Speed (?): 78.59 mph (126.24 km/h)
Drag-Adjusted Vehicle Speed (?): 70 mph (112 km/h) - 11% loss
Calculated Loaded KV Value (?): 2128.65
Calculated KT Constant (?): 0.61 oz-in/A
Calculated Motor Torque (?): 0.38 ft-lbs
Calculated Axle Torque (?): 5.43 ft-lbs
Calculated Motor Power (?): 2664 watts (3.6 HP)

i will be using an e-revo, with the Neu/CC combo, 6s lipo, 24 pinion, 65 spur, stock talon tires.

anyone think this is a realistic speed?

cheers

I beleive an 18 tooth pinion is recomended. that figure is with ballooning and isn't really attainable but theoretical

not with the stock Talon tires

Gear down or go with a lower voltage.

I tried almost that same set-up in my E-Revo: MMM/1515 1y (2200kV)/6s lipo/24-65

I didn't bother GPS'ing it, but it was way faster than what my Badlands could handle. I have since dropped it to 5s and things are much more controllable. I'll also be dropping to a 22T pinion when it gets here.