Basic4200 "Supermotor"?

[glassdoctor]

After Optima's tests of the 4200 in an Emaxx: 45mph on 12 cells, I'm wondering what this motor is capable of?

What other vehicles have had awesome results with this motor? Or the 5300?

Question for Optima and others who have used this motor...

Do you have to gear it so it runs really hot to get this performance? Can it run for say, 20 minutes without cooking?

I have been thinking about a good setup for 1/8 buggy and Emaxx. Now I wonder if the 4200 would provide adequate speeds for racing, with better runtime than other choices like the 3100XL or B50 8L, as well as the option of using a less expensive controller.

If I run a 1/8 buggy with a 4200 and 14.8v lipos, the math say I could use a Jazz 55 esc... That setup would only cost @$350 and should be very efficient, right? (The basic 3100 would probably be better for the 1/8 scale gearing... but that only makes this setup better)

[OptimaMan]

My next test it to run the emaxx with 14/66 gearing only in first gear. I'll actually time the whole run and then I'll take measurements of temps for motor, batteries, and controller... Stay tuned..

[OptimaMan]

Ran all-out with the 4200 14/66 gearing through grass, dirt, construction, street, back and forth w/o ever stopping. I got 11 minutes run time, batteries were approx 140 degrees F, controller was 125 degrees, but motor was a scorching 240!!!!

Now, the tires were stock - which are much heavier than ProLine bow-ties. If I go with Proline Bow Ties and drop 2 teeth, I'm probably going to get 15 minutes easily and my top speed in first should drop to about 26 mph instead of 30. Motor should probably run much cooler - maybe about 200?

Doing some math - 11 minutes of run time on 3300's means that I'm pulling approx 18 amps continuous and at 14 volts, that's approx 252 watts of average input. Isn't that interesting? I'm only averaging 18 amps which means I probably spike the current to up to maybe 50 amps. This tells me that the regular basic series are probably more efficient than the XL's because the XL's are more efficient at even higher amp draws. At least for my application. I'm going to have to get a nice big finned heatsink if I'm going to race my emaxx.

[glassdoctor]

Thanks for the test run.. 240 is a bit too much. :eek: But 190-200 wouldn't be bad. My C50 would run @180 after most of a 3300 pack on the track, as I recall? My Novak esc runs about 220-240 :D

Ok, I would think the 4200 would do well in a light race maxx with lipos and bowties. Qualifiers would not be an issue for heat.. and there is only one 15 minute main for me. I'm sure it could survive the occasional hard 15-20 minute run. Drop one or two teeth if you really need to...

I'm still amazed that such a little motor can throw around an Emaxx. With your current gearing, it still has great acceleration?

11 minutes on 3300s is very good! I don't think I could get that with my C50...

I wonder what a basic 3100 would do as far as heat/runtime? It would have to be very good...

[n2rcn4fun]

i just ordered a 3100xl to put in my emaxx but mine is light, no alum ,proline suspension...i was under the impression that on the novaks one could not go over 8.4 amps..i have a 5800 in a xxx4 set on sportsman and its the right mix at our track for traction and speed...i got to belive at 8.4 amps on a 5800 on say setting 1 could move a emaxx fine, that is if i have done my toqure calculation correct.......and since i have botha emaxx and the 5800 its darn hard not to try it....of course a fan on the esc is required.. so what ya think give it a try or what..lmk

[glassdoctor]

A big problem with the Novak is the limit of 7 cells... you can't just gear it real low and then add cells. If you could run it on 10 cells, it might do well. Seems I've heard that one novak runs about like stock...

The report of the novak E doing 30+ is pretty good, but I would be concerned about major heat issues.


I have heard of pretty good results with two novaks in an e...

[OptimaMan]

Besides the number of cells, the SS5800 doesn't have as much torque. I'd rate it like a 4500 kV motor and "400" sized in terms of motor power. A C40 is 400 sized, a B40 is 400 sized, a Lehner 15 series 400 sized. It's good for TCs, buggies, but not enough torque for MT.

I actually have 2 SS5800's I could use on my emaxx - but for some reason, I just don't wanna even bother trying it! Besides, if I ran 6 by 6 cells, the motor would probably spin closer to 30,000 rpm and gearing it with 18/66 would only give me a top speed of about 30 mph in second gear! If the motor truly doesn't bog down too much, I might get mid 30's mph. So, why do I want to go slower and add 2 motors and 2 controllers? My opinion: best case scenario with 7 x 2 cells with 20/66 gearing - you might be high 30's MAYBE 40.