Brushless RC8T gearing?

[Ryu James]

i keep seeing this info (see below) posted around. how do i get my hands on this calculator and can anyone that might have it run a couple of figures?

what is the speed of a Losi8t with 15/48 gearing and 5s on 2700kv?
and what is the differential ratio on the RC8T? i will be running the same 5s on 2700kv and want speeds similar to my losi8t.


(sample from another thread)

Differential Ratio: 4.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 48
Pinion Tooth Count: 13
Total Voltage: 14.8
Motor KV: 2700
Tire Diameter (inches): 5.8
Tire Ballooning (inches): .2
Motor Current Draw: 0
Motor coil Ω: 0.004
Spur/Pinion Ratio: 3.69 : 1
Total Ratio: 15.87692 : 1
Tire Circumference (inches): 19.48 inches (494.74 mm)
Total Motor Speed: 39960 RPM
Vehicle Speed: 46.42 mph (74.57 km/h)
Estimated Adjusted Speed: 44 mph (70 km/h) - 6% loss
Effective KV Value: 2700
KT constant: 0.5 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...