MMM 2200kv Combo ships....

[Smashwings]

Originally Posted by XSKAPE

if you plan to throw it away. throw it my way :-P

anyways has any one got advice on the 21/51 pinion/spur if this will be ok on 4's?

21/51 would be nice speed (43 mph), but i think 51 Spur is too little and the motor could hit the transmission (maybe in the High GC holes), and where did you find a 51T Revo Spur?

Differential Ratio: 2.8461538461538463
Transmission Ratio: 1.8333333333333333
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 21
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0.1
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.43 : 1
Total Ratio: 12.67216 : 1
Tire Circumference (inches): 18.85 inches (478.78 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 45.86 mph (73.67 km/h)
Estimated Adjusted Speed: 43 mph (69 km/h) - 6% loss
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

[XSKAPE]

Originally Posted by Smashwings

21/51 would be nice speed (43 mph), but i think 51 Spur is too little and the motor could hit the transmission (maybe in the High GC holes), and where did you find a 51T Revo Spur?

Differential Ratio: 2.8461538461538463
Transmission Ratio: 1.8333333333333333
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 21
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0.1
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.43 : 1
Total Ratio: 12.67216 : 1
Tire Circumference (inches): 18.85 inches (478.78 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 45.86 mph (73.67 km/h)
Estimated Adjusted Speed: 43 mph (69 km/h) - 6% loss
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

Nylon 51 tooth spur gear - Ofna
http://www.rc-monster.com/proddetail.php?prod=ofn30110

I've got UE diffs so the trans ratio is 3.31

would the below be ok?

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 21
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.43 : 1
Total Ratio: 13.83455 : 1
Tire Circumference (inches): 18.22 inches (462.82 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 40.61 mph (65.23 km/h)
Estimated Adjusted Speed: 38 mph (62 km/h) - 5% loss
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

[Smashwings]

ok, so no problem then, I was thinking about an E-Revo and the E-Revo transmission that have problems with low Spur gears.

Maybe you may add a little tire balloning to the calculator, if you tape the tires there's a little balloning too.

I want about the same speed for my E-Revo when Combo arrives, for me 20/54 about 40 mph, 4s, for the track.