Dual Motor Question

[klampykixx]

This has probably been asked hundreds of times before, but i couldnt find anything specific to my question.

in my wraith based 1/6 F350 (trail truck- not looking for bulk speed) i plan to use a double 16t brushed motor, a 2s2p 4400mah 20c lipo, and the stock Axial ESC.

what im wondering is, the truck will weigh ALOT so, will the motor be stressing to the point where gearing down will only get me so far? planning on using the stock 20tooth pinion, where it in buggy form was running a 28t for more speed (it was also a lot lighter like that....)

so, my Q is this.

im not wanting to go BL at this time so am i better off accepting a lower speed and running more gear reduction while keeping the torque there, or can i run a dual motor setup where the 16t has the bigger pinion and say a 20t has a smaller pinion and run them in series to "show" as a single 36t but with the torque of the 20t and the power of the 16t ?? (does it even work like this??)

or should i be looking for a pair of 55t and run them in parallel with the same pinion on each??

ive always wanted to run a dual motor setup, and this is the perfect excuse, but if its truly not needed then i wont bother. ( which would of course be the more wallet friendly option )

TIA.

[Terra Nova]

I am not really experienced with dual motors, but I don't think you can run 2 different motors. I assume they would fight against each other. I am running dual 550 21T motors on my SCX10 wired in Parrallel. The torque comes from having 2 motors, and I geared mine higher. I am running 23T pinion and 80T spur with 3S. It is fast for a trail truck and seems to have plenty of torque. I have not had it out for a good trail run yet.

[klampykixx]

ok so based on that, my logic said that two different motors would fight but theory says they should work together electrically... sounds kike if i want two i need a matched pair.

also thinking the upright Emaxx? tranny with dual motors would be more fitting also..

[stanmondz]

level3 rc has a dual motor mount for scx/ax trans, dont know if there the same as a wraith trans. both motors have to be the same wind,they got to spin at the same speed
i run 2 65t motors in my 6x6 on 3s geared 14/87 its faster than walking pace.

if you use a emaxx trans, get one from a 3905 or newer maxx, it'll have steel gears. the older 3906 is 2speed but plastic geared

[klampykixx]

yea, ive been looking at the L3 dual motor mount, thats likely the way ill go. and ill be sure to run a pair of matched motors/pinions. ill probably source another axial 20t like the one that came in the wraith.

[klampykixx]

toml make sure im lernding proper, if i run two 55t motors in parallel the ESC will see it as a single 27.5t motor as far as load is concerned. so does that mean they will spin as fast as a single 27.5t motor and also have the torque of two?

if it doesnt spin faster than a normal 55t i should still be able to upsize the pinion due to the doubled torque tho yes?

i have been thinking about what motors to get and dont have a big motor budget. i currently have a double16t and an axial ax24003 wraoth motor. i could easily get another of either. unless peeps are suggesting to go higher windings..

please learn me some more on duallies

[stanmondz]

you are right, 2 55t motors will be seen a a 27t motor. motor winding divided by number of motors. they will spin as fast as a 55t, its just the load the esc will see that will change.

2 55t's on 2s will be slow as balls though.
iv had good luck with the 10 dollar throw away motors from rc4wd and the cheaper integy motors. there the only motors i got

and the level3 mount is nice, its pretty beefy, price is right and shipping is fast

[klampykixx]

hmmm regarding speed. i want something thats at least walking pace. but also has the ability to spin the wheels fast enough to eventually fling some mud.

so if i go dul 20t in series that will reduce the speed similarly to a single 40t because now its splitting voltage. but in parallel it will probly burn out my esc.

so keeping with 2s2p pack it seems maybe the dual 55t with bigger pinions might be the way to go.. what do u all think?

[stanmondz]

what esc are you going to run? that limit will determine what motors you can get away with. series on the motors would make em really weak,power would be equal to a single motor. no reason to get the dual mount

55t's on 2s could be walking pace, but not enough to sling mud out of the tires. consider stepping up to 3s.
i was a hold out for my 2s packs, i got 20+ 2s packs.but the bigger,heavy trucks do so much better on 3s, i buy one as i can afford, so far i got 1 4500 3s

[klampykixx]

esc is stock axial that came ij the wraith. reason im referencing 55t is ive only lokloked at the axial 55t motors on ebay. ii really havent looked yet

i hear ya on the series connection tho. definate no. but back to parallel, im currently runnig a 16t with a 28tooth (27?) pinion abd stock wraith spur. this will feed into a 1:1transfer feeding AR60 axles. they just might get some O.d or U.d gears pending on speed.

perhaps i could go with a pair of 35t motors. that will bribg me back to 17t @Esc and still have more grunt than what i have now...

all just speculative atm of course...

[stanmondz]

that AE2 esc has a 19t limit, dual 40t's is your limit

[Olle P]

I'd recommend that you do as Terra Nova and use 21T 550-motors, on 3S with a new ESC.
The 550s have more torque and efficiency than 540 with the same wind.

[klampykixx]

can i run dual esc off the same signal and have on motor on each or is that just silly?

[stanmondz]

should be able to, just use a "Y" servo harness.
didnt think about a 550 motor, a single emaxx titan 21T may serve your needs. how heavy is the truck?

[klampykixx]

figured its best to link to the build so anyone else reading this thread can get a better idea of the grunt i actually need.

Klampyz Wraith turned F350

[klampykixx]

i have a couple higher turn motors on the MOA 1/8 HSP crawler i have, im thinkin i might use them as a starting point. at least theyre matched. and from there, if i need more powah ill source better motors for it.

i like the idea of the 550 motors tho, much more powerful than the 540's