I killed it... MMMv3 bit the dust

Well I received my v3 replacement about two days ago and fired it up today.......

e-revo
1515/1.5d
no external bec just the internal one
two 3s zippy 4800mah packs in series

it started right up the first time and hooked up to my futaba 3pm 2.4 no problem......like a charm for about 15min..... real fast and suddenly just quit...I had it set custom at 19.2 volts cutoff....low timing......everything else was default except for soft start...kept checking temps after every two runs....batts werre about 150 esc was about 170....motor 150


took it in the house and hooked it back up to my pc and couldn't get it to recognize the monster....but notices that programmer thingy got real hot


real depressing

[Silver_Flame101]

Wow..... That is exactly what I did not want to here; a MMM v3 failure. Hopefully it was just a quirk.

[MetalMan]

Overgeared? MMM at 170 makes me think so. Your batteries weren't enjoying the punishment either, apparently.

24/58

no smoke or fire...just quit

[George16]

That's the first confirmed death of a V3.

[BrianG]

I think we are all just a wee bit over-sensitized to any MMM failure, but there are bound to be failures here and there, even with a solid product...

I too think the ESC was a tad hot, especially considering it has a fan. The fact that the link gets hot when you plug it in leads me to believe you smoked part of the brains.

Wow batts at 150* That is way hot for lipos.

[hoovhartid]

hey man,
I'm gonna go out on a limb here and say that gearing a 12lb truck for over 70mph....
...you're only gonna be able to do a few speed passes before a need for cool down.

dude you're mean to your electronics.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.8333333333333332
Other Ratio: 1
Spur Tooth Count: 58
Pinion Tooth Count: 24
Total Voltage: 22.2
Motor KV: 2700
Tire Diameter (inches): 5.9
Tire Ballooning (inches): 0
Motor Current Draw: 120
Motor coil Ω: 0.004
Spur/Pinion Ratio: 2.42 : 1
Total Ratio: 12.61004 : 1
Tire Circumference (inches): 18.54 inches (470.8 mm)
Total Motor Speed: 58644 RPM
Vehicle Speed: 81.63 mph (131.12 km/h)
Estimated Adjusted Speed: 72 mph (116 km/h) - 11% loss
Effective KV Value: 2641.62
KT constant: 0.5 oz-in/A
Motor Torque: 0.31 ft-lbs
Final Torque: 3.95 ft-lbs
Final Power: 2664 watts (3.6 HP)


not to say I wouldnt still hold the camera and wear the shin guards
call me up if you need a videographer!

[lincpimp]

Originally Posted by hoovhartid

hey man,
I'm gonna go out on a limb here and say that gearing a 12lb truck for over 70mph....
...you're only gonna be able to do a few speed passes before a need for cool down.

dude you're mean to your electronics.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.8333333333333332
Other Ratio: 1
Spur Tooth Count: 58
Pinion Tooth Count: 24
Total Voltage: 22.2
Motor KV: 2700
Tire Diameter (inches): 5.9
Tire Ballooning (inches): 0
Motor Current Draw: 120
Motor coil Ω: 0.004
Spur/Pinion Ratio: 2.42 : 1
Total Ratio: 12.61004 : 1
Tire Circumference (inches): 18.54 inches (470.8 mm)
Total Motor Speed: 58644 RPM
Vehicle Speed: 81.63 mph (131.12 km/h)
Estimated Adjusted Speed: 72 mph (116 km/h) - 11% loss
Effective KV Value: 2641.62
KT constant: 0.5 oz-in/A
Motor Torque: 0.31 ft-lbs
Final Torque: 3.95 ft-lbs
Final Power: 2664 watts (3.6 HP)


not to say I wouldnt still hold the camera and wear the shin guards
call me up if you need a videographer!

Jesus!!! And I though my 1521 1y on 6s would be a bit much... The tires must have been 8" diamter minimum at those speeds...

[lincpimp]

Just for comparision I run a 1515 1.5d in my erevo on 4s lipo geared 19/50. It does over 40mph and never breaks a sweat. It does work a pair of trakpowers pretty good though... I have a pair of fp 4s 3700 packs that I plan to run in parallel, that should provide plenty of juice.

yea, a 1515 1.5d on 6s is a bit much...ESPECIALLY AT THAT GEARING!

I run the 1515 1.5d on 4s with 24/62 is goign 45+...

and are your batteries the 15c zippy? sounds like they are COOOOKING

Originally Posted by hoovhartid

hey man,

dude you're mean to your electronics.

!

HA...this from a guy who opens his beer bottles with his MMM


she handles like a dream though....flew over the speed bump like a bird and landed like the space shuttle

I'm going to blame it on Larrydino over at traxxas....I was trying to win the $20 for the first guy to hit 70 with the mmm...not really for the money...for bragging rights mostley

anyway ya I wont be trying that again

[crazyjr]

Originally Posted by hoovhartid

hey man,
I'm gonna go out on a limb here and say that gearing a 12lb truck for over 70mph....
...you're only gonna be able to do a few speed passes before a need for cool down.

dude you're mean to your electronics.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.8333333333333332
Other Ratio: 1
Spur Tooth Count: 58
Pinion Tooth Count: 24
Total Voltage: 22.2
Motor KV: 2700
Tire Diameter (inches): 5.9
Tire Ballooning (inches): 0
Motor Current Draw: 120
Motor coil Ω: 0.004
Spur/Pinion Ratio: 2.42 : 1
Total Ratio: 12.61004 : 1
Tire Circumference (inches): 18.54 inches (470.8 mm)
Total Motor Speed: 58644 RPM
Vehicle Speed: 81.63 mph (131.12 km/h)
Estimated Adjusted Speed: 72 mph (116 km/h) - 11% loss
Effective KV Value: 2641.62
KT constant: 0.5 oz-in/A
Motor Torque: 0.31 ft-lbs
Final Torque: 3.95 ft-lbs
Final Power: 2664 watts (3.6 HP)


not to say I wouldnt still hold the camera and wear the shin guards
call me up if you need a videographer!

Till i saw the inside of the case, I was wondering and still wondering. The bold and underlined part makes me wonder, whats the theorettical RPM of the mamba monster on 2 pole motors? The RPM shown would be 117,328 RPM's as seen by the esc due to being on a 4 pole Neu. I am wondering what the RPM or phase shifts the esc can handle. I hope thats understandable

[auto2]

yea overgearded BUT a MMM should shut itself off if it gets too hot no matter what is going on wrong around it.right?