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rchippie · 11:15 AM

I just had my friend dave order me a OFNA ultra GTP . I will be using the medusa 70mm 2300 kv motor on 4s. What size pinion would be good. Im came up with this using a 13t pinion .

Differential Ratio: 3.142857142857143
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 49
Pinion Tooth Count: 13
Total Voltage: 14.8
Motor KV: 2300
Tire Diameter (inches): 4.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 3.77 : 1
Total Ratio: 11.84615 : 1
Tire Circumference (inches): 14.14 inches (359.08 mm)
Total Motor Speed: 34040 RPM
Vehicle Speed: 38.47 mph (61.79 km/h)
Estimated Adjusted Speed: 37 mph (59 km/h) - 5% loss
Effective KV Value: 2300
KT constant: 0.59 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

	(#5)
rchippie RC-Monster Brushless Offline Posts: 2,824 Join Date: Apr 2005 Location: largo fl	10.14.2008, 11:09 AM I just had my friend dave order me a OFNA ultra GTP . I will be using the medusa 70mm 2300 kv motor on 4s. What size pinion would be good. Im came up with this using a 13t pinion . Differential Ratio: 3.142857142857143 Transmission Ratio: 1 Other Ratio: 1 Spur Tooth Count: 49 Pinion Tooth Count: 13 Total Voltage: 14.8 Motor KV: 2300 Tire Diameter (inches): 4.5 Tire Ballooning (inches): 0 Motor Current Draw: 0 Motor coil Ω: 0 Spur/Pinion Ratio: 3.77 : 1 Total Ratio: 11.84615 : 1 Tire Circumference (inches): 14.14 inches (359.08 mm) Total Motor Speed: 34040 RPM Vehicle Speed: 38.47 mph (61.79 km/h) Estimated Adjusted Speed: 37 mph (59 km/h) - 5% loss Effective KV Value: 2300 KT constant: 0.59 oz-in/A Motor Torque: Amperage not specified... Final Torque: Amperage not specified... Final Power: Amperage not specified... REAL MEN RUN BRUSHLESS Last edited by rchippie; 10.14.2008 at 11:15 AM.