CC2650 Eagle Tree Data 5s Lipo

[SpEEdyBL]

I did a short run with the the Elogger in my 8ight today. It was short because the kyosho plastic spur gear began losing its teeth but here are some of the results.

Gearing: 12/46
Battery: NeuEnergy 25c 3900mAh 5s.
Timing: 0
LVC: 16.2 volts
Punch Control: 60% (helps minimize amp spikes from radio glitching)


As you can see in the graph, the motor draws about 50-60 amps under acceleration. There is an 88 amp spike after peak rpm is hit, either because it began to wheelie after reaching the peak of a hill or because the road very bumpy.

Max current recorded during the run was 119 amps.
Avg. Amp draw while I was running was about 18.5 amps.
Min Voltage was 16.21.

Going by the max rpm readings, top speed was at least 53 mph with the 4.5" dia. tires i was running. Way too fast for the area I was running in, as i rarely even used full throttle during any point in time during the run.

Temps at the end of the run (5min) were 138F motor, ~150F MMM (fan was on then turned off when was checking temps), batteries 95F.

Anyways, Enjoy!

[SpEEdyBL]

Here is a section of another graph, but with 4s and everything else the same. I had another plastic spur and decided to use tighter gear mesh this time. I Forgot to mention that the ambient temperature was about 45F for both runs.

Gearing: 12/46
Battery: NeuEnergy 30c 4100mAh 4s.
Timing: 0
LVC: 13.0 volts
Punch Control: 60%

The pack was not fully charged, but I managed to get 2500 mAh out of in about 8 minutes of running or about 18.75 amps on average. Same as with 5s, although i was on full throttle much more of the time. You can see in this graph that it takes about 25 amps @ 14v or about 350 watts to maintain a speed of 40mph.

Also during the run:
Max current: 94 amps
Max speed: At least 42 mph
Min Voltage: 12.09 volts (something is wrong and this has happened before and on the graph near the end of the run there is a sustained voltage of 12.4 volts!)

At the 5 min mark, motor temps were around 140F. At the end of the 8 minutes temps were 148F on the motor and 110F on the battery.

One other note: On both graphs when rpm is decreasing and current reaches 0, after that is actually current being put back into the battery.


Anyway, it's pretty safe to conclude that this motor can handle 5s just as well as 4s and ideally you would gear lower with 5s. Yesterday, although i didn't have any measuring devices, I did another 5s run in a wide open area, with full throttle most of the time and I could keep my hand on the motor for quite a long time without pain.

[hemiblas]

Nice. Thanks for the data.