Low torque brushless
 

I need a new motor for my Stampede. I mainly use it as a buddy bash vehicle, so I want low easily controllable torque. But want enough speed so it's not a turd, thinking around 45mph. I plan on running 3s through a MM controller. So far I'm throwing around a Fiegao 380c 13t http://www.rc-monster.com/proddetail...AO_380C&cat=20 Novak 8.5( which is what I had before, but was still a handfull on 3s) EZrun 12t http://www.hobbycity.com/hobbycity/s...tor_12T_3300Kv (or just buy the combo deal with esc and program card for 80 bucks) But was looking for some more suggestions . I'm sure there are better ones available, but looking for low power is not a real popular subject. :whistle:

Use nimh batteries lol!

Actually A123 will still have less punch than lipo. As far as a motor, go with the castle cms4600 motor or a tekin redline sensorless motor of equivalent or less kv. Both are aircore/slotless motors with large dia. rotors, providing less bottom end torque and more midrange torque to get you the speed you need. I have a tekin redline 632 3200 kv motor for 3s and it has a lot less bottom end punch than any novak i've tried or any motor with a 380 size rotor for that matter.

Tricky, anything powerful enough to propel a 5lb truck to 45mph is gonna be pretty torquey I would have thought. What about a low kv motor (1100kv or so) geared up to the desired speed, that way the top end speed would be what you want, but the torque is reduced due to the higher gearing; only issue with that is the load it places on the electronics, so fairly good lipos would be needed + an eagle eye on the temps..

The Tekin sounds promising. What about some of the motors with adjustable timing like http://www3.towerhobbies.com/cgi-bin...?&I=LXTNU7&P=7 Anyone with experience with those? My 3s are kinda weak,MA 5000 probably don't fit that bill, but it was free. I also have a couple more of similar quality, SPC 5000's. I did think about a 28mm Medusa, but was thinking the 4 pole would still be torquey. I'm just trying to keep it off it's lid once it reaches the 25mph range, a problem that I once would have loved to have :)

That is a tricky one. Any BL motor small enough to have less power will probably also heat up because it is too small for the job. You could take a page from Novak's book in what they do with their HV line and use a smaller diameter motor and just spin it at higher rpms. So, something like a 380 size motor with a kv that will get you ~50k rpm at whatever voltage you run. Then, just gear it down. Will take a bit of figuring to determine the smallest gearing possible so that you won't be cruising at 80mph, lol.

How about a Neu 1112/1.5D on 3s? That will put the rpms at around 54krpm when wound out. From Griffin's graphing program, Neus retain pretty good efficiency up to around 57k rpm. And anyway, you won't be hitting that max rpm unless you are at WOT, which most people aren't most of the time.

Yeah, it has my mind pondering. I had looked at the Neu's, but really don't want to spend that much ,136 ,for a motor thats sole intention is to be underpowered, was kinda unjustifiable. I really would like to keep it under 80 or so.
So here's kinda what I'm thinking with the Ezrun combo. With the smaller esc, smaller wires and basically more resistance on the way, it would slow the amp flow some. Thus giving me less torque, motor cooler, yet still being capable of 3s, giving me more speed. Compared to using a MM , which would feed these size motors all they want.
Am I just asking for trouble, moving from 1 weak link,the motor, to 2 weak links, motor and esc. I can get the 35a 9t combo for 69 bucks shipped, with program card. Not really a wallet breaker.

what about an esc with punch control??

where can you get it for that cheap?

The punch control helps down low, but it still has a tendency to have to much torque through the mid range. The rolling from 1/2 throttle to full throttle.You can find it for like 80 dollars shipped on Ebay, and if you use Microsoft cashback, you can get 14% cashback later.

I think a medusa 36-50-2200 would be an efficient low-power setup, but can be geared nicely to achieve high speed.

As I stated in my first post, that actually will not result in less torque. Novaks have A TON of bottom end torque, and I am sure a neu 1112 will too because it is also slotted.

Anyways for speeds of 25 mph the Tekin 632 is your motor. You will easily be able to gear for 35 or 40mph on 3s (whenever you like) but no matter what gearing the initial torque will still be roughly the same, which is what you want. In fact, I've run a neu energy 4s 4100mAh 30c pack through this motor (overkill) and it was fast, but bottem end was still easily manegeable.

I wasn't saying to use a Novak specifically, just something along those lines. I've seen a Novak take-off. They do have torque, but seemed to have less than a Neu for instance. Of course, I didn't check out the gearing or batteries.

I know torque is a function of kv and amperage. So, if a high kv motor is used with low to medium voltage, and geared normally, the system should have less torque. The medium voltage and normal gearing keeps the current at a moderate level, and the medium gearing also provides less torque multiplying.

Can you dial out throttle speed on your transmitter?
If you can- problem solved.

Take a look at one of Novak's motors with a "light" rotor in it. They reduce the torque and throttle response but not the final top speed.

The best you could do short of setting the EPA is increase the ESC punch control to 100%, and maybe decrease the timing to lowest. 100% punch control makes for a very driveable setup, you just don't have that wheelie-popping torque. You could also change the throttle curve to be more gentle off the line either in the ESC or the radio (via exponential setting if it has it).