quark or mamba maxx for e-revo

if the quark is having broblems with 6s then i'll probably stick with 4s as i'm planning to use two batteries connected in series in the revo so that i can use the same batteries one at a time in my xray fk05 and kyosho zx5... i'm still undecided about the motor though...

[cart213]

Originally Posted by MetalMan

Some time in the future I plan on trying the Mamba Max with 5s A-123 cells from a Dewalt power tool battery pack. The nominal voltage is 16.5v, 0.3v less than 14 cells.

I've been pondering whether or not I could get away with using 6s A123 cells on a MM. I know that's a lot of voltage (19.8v nominal), but I haven't heard of anyone frying a MM due to overvoltage yet :036: , so I wonder how much is too much? Didn't rtsbasic say that he was going to try 16 cells (19.2v)?

[Finnster]

Originally Posted by cart213

I've been pondering whether or not I could get away with using 6s A123 cells on a MM. I know that's a lot of voltage (19.8v nominal), but I haven't heard of anyone frying a MM due to overvoltage yet :036: , so I wonder how much is too much? Didn't rtsbasic say that he was going to try 16 cells (19.2v)?

Haha, this is what I've been planning to do for a while, but I've been keeping it under wraps. :) Problem is my Triton v1 charger only charges lipos @ 2A, so I'd have to get another charger (for wait forever), and the SPT are ~$20ea for the A123 cells. Plus I'd have to redo my batt trays as the M1s are so wide. so plans have been on hold.

However, I've been doing some more testing with the MMax, and I successfully ran it with 16 cells last night. I had been using 15 for a little while with no issues, so decided to go for it. Nice. Two critical factors I am looking at; peak and discharge voltage. W/ the NIMH I am saying a high 1.45V/ cell, so 16 cells=~23.2V Very high, but obviously this drops very quickly after a little discharge. From graphs I've seen, I'd put loaded V @ ~1.1V/cell (depending on batts), so ~17.6V.

The M1 cells peak @ 3.7V/cell, and look like they drop to ~2.7v/cell under a 40A load. => ~16.2V for 6s, but only peak @ 22.2V.

The numbers are very loose, so don't get to hung up on them for exactness, but I do think the MMax would easily run 5S M1, and even 6S M1 with care. I am also thinking it would run 5s lipo (if peak =4.2V/cell, ~3.3v/cell loaded.) This actually looks the best situation as peak voltage is only ~21V, but under load the voltage should be about the highest. This is the plan I've been leaning towards lately (getting a 2S and 3S and saddling them) vs the M1 cells for ease of fit and charging.

I have some more testing to do, it was only a few speed runs and some bashing, but nothing blew up. If it does nuke, its only $50 to fix for any reason. Temps stayed very low, ~100F Esc, but it was only 59F outside. Don't know how it would fare 90+F in summer.

@BrianG, checked the manual, and it does talk about 4s so that would be ok IMO. I was thinking about my Mtroniks or some other esc I believe that had some wierd spec of 12cells/ 3s lipo.

@Cartwheels: I've never seen that w/ mine after ~2mos of use... Maybe something w/ yours in particular or your setup? What motor?

[cart213]

Cool! Congrats with the successfull 16 cell test! You are using a fan on the MM, right? Let me know if you run into any problems. I've already got 6s M1 packs ready to go, I just need to spring for the MM if I decide to go that route. I'm waffling between keeping the quark or selling it to get the cheaper MM. Most of the time I'll just use 4s, but I want the capability to do 6s M1 if I want more power.

Btw, the resting voltage of the M1 cells is 3.3~3.4v, so the 6s peak would be less than the 22.2v you mentioned, more like 20v.

[Serum]

You mean that the MM is only 50 bucks to have replaced by CC when you burn it due to your own fault? the mamba (1/18th) was 25 to replace.

[Finnster]

Originally Posted by Serum

You mean that the MM is only 50 bucks to have replaced by CC when you burn it due to your own fault? the mamba (1/18th) was 25 to replace.

That's what I read in the back of the manual last night when I went to double check the 4s thing. There is a 1yr warr, else $50 repair fee as I read it.

Your Mamba Max ESC is warranted for one (1) year from date of purchase to be
free from manufacturing and component defects. This warranty does not cover
abuse, neglect, or damage due to incorrect wiring, over voltage, or overloading.
The flat rate charge for non-warranty repair/replacement (for any reason) is
$50 for your Mamba Max ESC, and $45 for any CM36s motor.

http://www.castlecreations.com/support/documents/Mamba%20Max%20User%20Guide.pdf


@ Cart213: G/L, but if you blow it up, don't blame me! All above spec use is at you own risk! :)

I am using a fan, a small 5v 25mm fan I bolted to the HS. I calc'd the voltages off of the M! spec sheets IIRC. I took the worst case senario, such as pulling it right off the charger and plugging it in. Same w/ the NIMH. As long as it doen't nuke right when you plug it in.. I guess the worst worst case would be if you chilled the M1's and charged, at they say they charge to 4.2V/cell @ 0*C. Use a voltmeter before you plug in anything to be safe.

[cart213]

Originally Posted by Finnster

@ Cart213: G/L, but if you blow it up, don't blame me! All above spec use is at you own risk! :)

Of course. Everything with brushless conversions seems to be: proceed at your own risk! :037: Especially when you're pushing the limits.

i just came back from speaking with to the crew from castle creations today at the iHobbyExpo 2006 in Chicago and they told me some some of the specs about the mamba monster maxx prototypes their testing now and OMG!!!! i'm definately waithing for it and getting the mamba maxx for now so that i can use it in the smaller stuff later... they say its about 2.5 months out

[BrianG]

Originally Posted by abiye

i just came back from speaking with to the crew from castle creations today at the iHobbyExpo 2006 in Chicago and they told me some some of the specs about the mamba monster maxx prototypes their testing now and OMG!!!! i'm definately waithing for it and getting the mamba maxx for now so that i can use it in the smaller stuff later... they say its about 2.5 months out

Well, are you under some type of NDA, or do you just enjoy keeping us hanging? Tell us about the prototypes man! Even though the beta versions aren't set in stone, the specs they are using should give us an idea of what to expect.

6s or 5s and pretty much double the current rating...

[jhautz]

I am really hoping for 6s...

Its no good for the drivetrain, but it sure is fun.:D

[Finnster]

Originally Posted by abiye

6s or 5s and pretty much double the current rating...

:004: