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12.31.2009, 05:11 PM
Ok... I made another 'test' run today with two packs... the first was not fully charged, but it had enough get the motor turning well. It's quick and smooth on power... breaking was excellent...
stopping was noticeably easier with the 1520... temps on the motor went up to 120° F and the esc 122° F (no heatsink)... I think I got about 5 minutes of WOT run time with this set of batteries...
with the 'fully' charged packs I got 10 mins WOT... I pushed a lot harder with these cells and saw that this truck will be a handful when I finally get some lipos for it... I was a little aggressive with
the throttle and brakes just to see how hard it could be pushed... the temps of course were a little different... 137° F for the motor and 135° F (still not heatsink).
Here's the setup:
Differential Ratio: 4.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 51
Pinion Tooth Count: 15
Total Voltage: 18.5
Motor KV: 1600
Tire Diameter (inches): 5.65
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 3.4 : 1
Total Ratio: 14.62 : 1
Tire Circumference (inches): 17.75 inches (450.85 mm)
Rollout: 1.21:1
Total Motor Speed: 29600 RPM
Vehicle Speed: 34.03 mph (54.67 km/h)
Effective KV Value: 1600
KT constant: 0.85 oz-in/A
I think when I finally put all back together, i should be able to gear up a tooth or two. The temps on esc were really good and I was quite impressed it had no thermals running without a heatsink.
Alien
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