New test lightning+1930+4S 4900
 

Hallo boys today i have test my lightning, with new pack of flightpower 4S1P 4900
20C continuos 30C average and 50C burst.
The motor is 1930/8, the esc is MMax with UBEC, the gearing is 12/44.
This battery is fantastic, the punch is very strong, my runtimes is 15 minute,run on street at full trottle, and continous acceleration and brake.
The temperature on battery is 40C°, Esc 40/45C°, the problem is motor,90C°!!!
The 1930 pulls 120 ampere, 1600 watt, but seem too little for stadium truck?
I need a more torque? (1940) or my gearing is too long?
The car speed is 75/80 Kmh, wheeling at full trottle.
Plese explain me because my motor is too hot.
Thanks very much

Hmm, that is is a pretty small motor, if you'd want real power a 1950 6T would be the answer, or you could try a 1940 7/8t.

90C for that motor is HOT! Do you have a video of your lightning?

Yes the video is up a short :)

How about installing a RC-Monster hetasink and a cooling fan?

Instead of buying another motor, think about a way to keep your current motor cool.

80kmh/50mph is quite impressive from a small motor and only 4s.

Even though, capt, 90C is really hot, a rcm heatsink and a fan would only bring him down 10C at most, his motor is too small for his application, and those batteries are giving it alot of juice.

The motor is supposed to be at danger when it reaches 100c(150c internally).

I would not worry so much. Use a smaller gearing, heatsink and a cooling fan..really, not THAT scary..:)

Also, Virusss, if you have the regular can, you can change the winding of the motor. If its a 8 turn motor, it might be possible to make it 12-14turn motor.

Thats only 10C off its max operating temp, not very scary, BUT, it will not be as efficient at those temps, he could just run a fan and heatsink, but a bigger motor would be alot better!

BTW ; Whats up with your sig capt? Whats the problem with your grandark? Maybe we can help! :)

You are right, but is it really worth it to spend another $250 just to bring heat down?

Yes capt i have a regular motor, but for 4s i suppose 2600 Kv is ok, 2600*14.8=38480 Rpm, the gearin is the smallest i have my smallest pinion is 12 and the kyosho spur is 44.
I have a 1940/8, but 1960 Kv is not too slow for 4S???
1960*14.8= 29000 Rpm

He could possibly sell his current motor and buy a 1940/50..

Its all up to viruss, but, if it were me id spend that extra money to have it run right, if its anything that ticks me off when running, is high Temperatures.

Okay then, I thought you did not have a larger motor at hand. Switch to the bigger, then.

You can gear higher with the 1940, Virusss.

I run a 1950 7T on 4s which is 1867x14.8=27631 .. I havent acutally ran my lightning yet, but when i ran this motor on 14 cells it was acutally fast, and it didnt get hot, barely warm.

Sylvy, you're using the MaxAmps?

Yep, 8000mah 4s2p HV cells. Ill report on them once i get 2 last little bits :)

And with 1940 the amp surge is not too much?
1930 already pull 120 amp of my batteries

for gearing down you have to put in a bigger spur or a bigger pinion

i dont know if you have a 46 tooth spur, but you can try that

It will pull more amps, but your batteries are well capable of that.

You may even get more runtime, maybe similar, since ;

1930 / runs hot, pulls less amps
1940 / runs cool, pulls more amps..

You will have more sufficient torque with the bigger motor.

The video
http://www.brushless-italia.it/stadium.rar

Downloading now.. How long is it?

6-7 minute

Sounds good! :)

Viruss; what does the voltage of the pack does at the 120A load?

What i would do;

get a heatsink and a fan for that motor, it will bring the temperature down with about 15-20 degrees. you can get a 46T spur, which will help keeping it cooler too.

No wonder that motor is HOT.. with that driving, it is asking for a hot motor LOL..

it's fast Ettore! very fast.. Did you changed the oil in the centerdiff?

heheh, I wanted to push to bottom the setup...
The spur 46 dont fit (touch the chassi), my runtimes is 15 minute with on-off trottle :)
The graph is http://www.brushless-italia.it/data.rar
The oil in the centerdiff is 30000

Just watched the video.. Damn man you were pushing that thing! :) If you want you could just try the 1940 for kicks..

:) i like this truggy, and i love this Flightpowers battery

Looks like she handles well, what servo were you using?

The servo is Tower pro digital (chinese servo, but works very well)

Yeah, fast little bugger, that servo..

Ettore; can you get me the data saved with the eagletree? i can't read the voltages from that picture.. Thanks!

Thanks, as long as you guys are on, you think the hitec that mike sells (333oz of torque) is overkill?

Overkill.. Arh, that's not the case.. i have got that hitec too, it's a great servo.. fast and unbelievable strong.. but i used a towerpro servo in my Mugen buggy; and every time i switched it on, she amazed me with her speed and torque..

Yes Renè...
http://www.brushless-italia.it/eagle.rar
tell me what of tasks of these data, if the batteries are ok, or the effort too much

His eh... :005: :010:

Sorry for my english :D

Guys,

I've been thinking for a very long time if its possible to make a 3mm threaded hole in the rear shaft of the motor and screw in a fan to that shaft so the faster the motor turns the more wind the fan will give.

You think it's possible to do?

thats what the plettenbergs do captain.

Viruss; Those packs are THE bomb..

they do deliver the 3.5V per cell at a 100A load! and they keep doing that for quite some time...

And for you is ok with that setup?
I have regulated the cutoff to 12.8V, I would not want to ruin them

Whats the website for them ? I went to flightpower.co.uk but cant find international distributors.. They sound like VERY good cells!

Question ; These packs use enerland cells, dont the maxamps packs use these too?

I order of flightpower.co.uk is superfast...
I dont know if the maxxamps cell is the same