• Welcome to RCCrawler Forums.

    It looks like you're enjoying RCCrawler's Forums but haven't created an account yet. Why not take a minute to register for your own free account now? As a member you get free access to all of our forums and posts plus the ability to post your own messages, communicate directly with other members, and much more. Register now!

    Already a member? Login at the top of this page to stop seeing this message.

OutRunner brushless motors?

Status
Not open for further replies.
i only see one problem. what happens when the tires wedge? does it just pop back and forth a lot? of course it doesnt have car programming yet, so im jumping the gun here. i wish i had a shafty together. i have the parts around...

maybe you could trade your evx for a mamba or something.

and also, what axles, tires, and gearing are you using? maybe i missed it, but i want to know how much weight this thing is pushing! or is this your new rig. tlt axles with the tray on the side?
 
yep, it's the new rig, just an rch over 8 lbs all up. eliminating the Titan and EVX will drop a good bit of that, but still around 7-1/2 with a regular stick pack.

E-Maxx tranny, TLT axles, 10/70 primary gearing.

when a wheel gets wedged in the rocks, the motor sort of rocks back and forth, wanting to turn but soft-start programming won't let it really grunt.

i'll probably have to relocate the battery from the side tray. with a much lighter motor it leans to the battery side, so it'll go up on the links. can't wait to try it with a Mamba ESC!
 
dude... that motor is so small.. and it works.. jeez.. thats a great way to cut out some weight... i like that..

how much would a motor like that cost ? just curious... :)
 
jaime from starluck has the best customer support, great prices, and he has done a LOT for brushless in the states. good to see you here man.

kinda makes me think twice about starting production on a brushed motor now, seeing good results for once. the availability of brushless and the awesome controllers that are coming out might just make brushless work well. i am still weary of how they will act in a bind though. can it force its way out in the right direction?

geeze, ten amp draw with enough power to spare. thank good magnets and the outrunner design. my lathe motor isnt looking so hot anymore.
 
that particular motor goes for 70 bucks from Hobby Lobby International.

one thing i forgot to mention was the constant speed of the motor regardless of load. on the grass-bash section, it maintained constant rpm no matter how dense the grass/weeds were. where a brsuhed motor would bog down and speed up thru different secions, this thing maintained constant rpm, showing how much power it had in reserve. kinda spooky.
 
i had to make an adapter plate to get it to bolt up, but no biggie.

i found a Mamba esc in the "back room" of the LHS (you know how they keep all the GOOD STUFF in the "back room?". this one's a maypop, so i got to borrow it. if it blows, it was going back to Castle anyway. if it don't, i'll get it cheap.

will let you all know how it goes.
 
update w/ Mamba-25

holy crap.

that about sums it up. giving it more amps was just the ticket. starting torque is huge enough to strip both rear wheel hexes. the motor gets properly hot now, but nowhere near its danger point (150*C). still much cooler than a stock touring car motor after a race. the speedo's not even working hard. warm to the touch but not what you'd call hot or even uncomfortable.

there were one or two times it didn't want to get going at low throttle inputs. more throttle got it going each time. a slightly bigger outrunner should put all starting-torque issues to bed.

Mamba esc settings:
proportional forward & reverse
reverse throttle 100%
4v cutoff (just to be safe)
"race" timing advance (didn't try "extreme" but maybe i will)
starting power high
 
**** yeah. thats what i want to hear. im ordering the big axi on monday. it wont get as hot as the smaller one. how was your low speed control? is it truly crawlable? i guess the motor spins slow enough.

its too bad that axi makes the only motor that has the right specs (besides the cyclon motors) but both brands are expensive. there needs to be a cheaper solution. 100 bucks for a motor is not acceptable. maybe $50. all in the name of testing i suppose.

for your timing, i would play with all the settings. the extreme timing might have issues with startup speeds. once its gets spooled up it wont want stay slow.
 
thanks! i wasnt familiar with that one! i didnt know anyone had a motor to compete with the axi. sweeeeet.

do you know the mounting pattern for the face? 25mm spacing hopefully??
 
Last edited:
ok two questions. anyone try the e flite outrunners? and can one esc run two motors? this would be a big weight savings in a clod
 
one esc cannot operate two motors reliably. the esc uses the impedence of the motors circuits to determine where the rotor is. two motors wired together can really muck up the timing.

i have run the eflite motors in a few of my planes. i guess have four, err five brushless planes. the only brushed motor that i run is in my crawlers. the maintenance is starting to rear its ugly head in my brushed motors.

i do have an outrunner that i was going to try in my tlt. actually a complete copy of microgoats setup. emaxx tranny, tlt axles, 2.2's, and my own NVS (no vertical travel) chassis. first i have to build the chassis though. brushless needs more R&D for crawlers. its possible to have it near flawless like any other part of a design.
 
to run 2 motors you'd need 2 esc's, but they weigh next to nothing. but they don't cost next to nothing. you could run em independent or y-harnessed, and use one battery for both controllers.

with "normal" timing and starting power, low speed control is much better. it truly crawls and doesn't get as hot.

i don't think the E-Flite motors would work, as they are reccommended for 380-400 applications. the AXIs are for 550-600 apps. there is a noticeable difference in the feel of the motors, the AXI is much more notchy. plus the shaft is on the wrong side on the E-Flites.

for a smaller crawler (VMG, superslick) an E-Flite would work fine. but not in a big rig like mine or a Clod.

i'm still trying to determine runtime. i'm 50 minutes into this battery and still going strong.

a new problem, my rig is now too light to get much rear artic!
 
well i finally managed to drain the battery, 1 hour 15 mins into the crawl. 2000 mAh pack, and a beat up one at that.

one nice thing about the smaller motor is performance doesn't drop til the battery is all the way done.

i love this motor. no WAY it's going back in an airplane!
 
Woah nelly, this is a cool thread!
I was going to suggest you set the timing to the lowest setting. As you probably already know, higher timing = more rpm & less torque.
I have found with my Mamba stuff that the starting power setting is a tradeoff. For low speed operation with very high initial loads (getting the tires spinning vs. getting a prop spinning), a high start power setting might work better. From a stop, it should help kick-start it a bit better. The tradeoff is a bit of schizo behavior if you don't follow through from the start with a good amount of throttle input.
Of course all of my experience with this stuff is on a featherweight 1/18 car, so... grain of salt rule applies.

Regardless, I blew up two Novak brushless ESCs in my TXT-1 (prior to realizing the TXT-1's true purpose in life, heh). Novak fixed them both, no questions, but Charlie over there did recommend I not use it in my TXT-1 any more :mrgreen:
 
i don't fully understand brushless yet, but "normal" settings for starting power and timing advance worked better than "race" or "extreme". possibly because i'm only running 6 cells. the rpm is linear to the voltage input. 1 volt = 870 rpm (with this motor) regardless of load (up to the motor's capacity) unlike a brushed esc which says, essentially, here's a volt, see how much speed you can get out of it.

the more i wheel this thing, the more impressed i am.
 
ive got that mp jet motor on the way. i should have it in this week, and i will post up what i find. now to get busy having a vehicle to drop it into..
 
Status
Not open for further replies.

Similar threads

S
help building a very slow crawler
Replies
5
Views
1K
sfort
S
W
GoolRC 3660 3800KV Motor & Waterproof 60A Brushless ESC
Replies
7
Views
4K
Wehlee
W
P
SCX10 II Build List *Noob Alert*
Replies
16
Views
4K
triggerhapy
T
B
Help choosing a Holmes brushless motor
Replies
11
Views
2K
Biomedchad
B
Robbob
2017 .... its coming and we need growth
6 7 8
Replies
146
Views
56K
minicrawlerguy530
M
Back
Top