HV ESC Option

[BrianG]

This was originally going to be PM'd specifically to GriffinRU, but I thought I'd stick it here instead for others to chime in on.

We are all looking for an inexpensive, HiVolt/HiAmp controller that is usable with a pistol grip radio. Currently, all the choices out there fail in one or more of these areas. And, they seem to be all air ESCs, which seem to be a little weak on the burst current rating.

So, keeping Griffin's expertise with the "MM stage 2 mod" in mind, I thought about using two of these controllers modified so there is one brain, but 2 FET boards.



http://www.hobbycity.com/hobbycity/s...idProduct=4691

$200 for an ESC capable of 12s and 200A isn't bad at all IMO. All the ratings of "just" the 100A version seem to be all positive.

I'll probably pick up a couple and see what I can do, but am not set up to work on this level of PCB. Are you up to it GRU??

[bdebde]

I like how those ESC's say "bulletproof" right on them, must be good!

[BrianG]

Maybe for really tiny bullets?

I like how there is plenty of room for adequate cooling and looks like it will be simple to stack. Just a matter of possibly changing the FET gate drive...

[lincpimp]

Does this esc work with a wheel radio, or does it need a pixstix?

I like the idea BG, It would be cheaper than anything elese out there, but do we need 200 amps at 12s lipo? 8000+ watts is quite a bit, not sure if my mini t could handle that...

I guess that 11 horsepower is not that much...

[othello]

Well if this ESC is really able of 110A bursts then this should suffice easely if used with 8s Lipo (10s A123) or even more. At least it's more then enough (10s1p A123 @100A = 2.5KW) to wheelie a center diff driven 11lbs truggy. Don't know in what kind of car you could use double the amount of Watts -> 1:6 car maybe.

EDIT -> lincpimp was faster!!!

Aren't you concerned with the slower startup air esc normally have? In car application 0,3sec is about the max i would like to have but 0,6sec or more would feel sluggish. Would be interesting how long this one takes to spool up a motor to max rpm. From what i red it does not seem as "punchy" as a car ESC.

Could be an interesting project nonetheless.

[BrianG]

Yes, it does work with a pistol radio without an adaptor. The reviews say so and MetalMan has one and likes it. Yeah, 200A is a lot, but the burst current is kinda low, so if you use it at 120-150A, then you have that extra headroom.

[Haldir]

Starscream's got one send him a link to this thread. I must warn you he's a weird guy. Check your your glasses gramps it's $97.72 not $200.

[BrianG]

Well, I was referring to a price tag of $200 for two ESC's as one unit (after modding). And, I was rounding.

[MetalMan]

And you gotta have some extra cash for that programming card

I've used it for speed runs in my MT2 "direct-drive to diff", so haven't used it for anything that is meant to be driven. I haven't fully tested out all the options, but from what I've seen, it has a weird negative exponential type of startup (but that could just be because it's running an overgeared outrunner). In my MT2 it is coupled to a PiStix, so I can't comment on non-PiStix usage (even though my radio is capable of setting up the ESC without the PiStix).

[starscream]

Oh well, I guess you can consider me weird since I refuse to run anything less than 6S on my big trucks. I prefer 10S A123's or 8S Lipo.

So it sounds like noone here has used this ESC without the PiStix adapter.

From my previous testing with the HV110 I draw at most ~45AMPS avg and 100-110 bursts so this ESC should handle my Truggy fine.

I'll be racing my MBX5T with this ESC (stock config) tomorrow with 10S A123's so I'll have results Sunday.

[cart213]

Starscream,

How about some pics of that MBX5T? I'd like to see your layout.

[tashpop]

i'm also using this esc. i have it running with a mega 22/45/2 motor in my yusa rally on 8s1p a123 for now. esc runs cool. hottest i've gotten it was 119 on the caps. i'm also not using a pistix adapter. just 3pks radio. it setup perfectly and runs real smooth. its true you notice the lower take off power, but after a few feet, it starts pulling real hard. simular to my mgm on a lower setting. it still has enough to break the tires loose and leave marks on my drive way in my car. i'll soon go up to 12s1p on this setup. its very nice for the $$ so far. also yesturday i set my car cartwheeling into a water filled ditch and everything got wet. it survived, so thats on up on my bk that smoked from a very tiny drop. i'm sure i just lucked out. i should have known better to run it, but the neighbors dog came out chassing it and i dodged him and went off the road.

[tashpop]

http://www.youtube.com/watch?v=_gjWzlmtJLc

you can see my car run in this vid 2 times. both of them i had to feather the throtle because of wheel spin. i have foams now for next time out. just look the yellow mcclairen onroad. 2nd car in the vid, and again later.

[Sammus]

I run it without a pistix. Just straight up connected to my futaba 3pm fasst receiver. It is a little sluggish to start - almost like its got massive punch control... makes for cog free start though. If you go wide open from a stand it does seem to lack a little punch, but if you are rolling even super slow its got plenty on tap.


My (RCM) build thread.

Someone else's (tekno) build.

edit: all my pictures disappeared for some reason? I can't edit to put them back up either...

[BrianG]

Hmm, sluggish start may actually be good to save diffs/drivetrains and to help with off-the-line wheelspin, but not good if the ramp-up time is too long.

Has anyone gotten the programming card along with it? At $7 it seems almost stupid not to. I'm wondering if adjustments to the "Start Mode", "Timing", or "Governer" would have any effect on the delay people are noticing?