Quote:
Originally Posted by JaySki
PLease explain. Looking at Specs of both 1.5d and MMM, I shouldn't be outside of the parameters. and it shouldn't result in FIRE after about 3-5 minutes of maybe half throttle?
In all reality, 6S on that motor, I knew would be overkill, but I wanted to try a run on it. It was the first run.. Brand new batteries even.
I actually purchased the 6S for my Medusa.
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You are at the top line of spec only assuming adequate airflow. You must also account not just for rated current but stall current, spikes, and so forth.
The motor is rated at 120 amp and the controller at 120 amp with air greater than 500 lfm. Pretty tight when you look at it. Then factor in that with 0-200 lfm you get 70 amps, and 200-500 lfm you get 110 amps, you can see where the problem is.
Running the KV as high as possible is not the best way to get speed in a monster truck, you can't apply 10th scale or 18th scale formula's in a monster truck and/or 8th scale world. You are much better off to get a lower KV motor and gear down to attain the speeds you want. Then there is the fact the having a high speed setup on anything but the street changes the dynamics drastically.
Then there is my final note that your 15c batteries can't provide enough current for that setup. 15c at 5000 mah is 75 amps. You would need at least a 25c 5000 mah pack or at 15c an 8000 mah or higher pack. Cheap packs can damage the ESC as well.