ANOTHER Flux MMM goes up in flames!? - Page 2 - RC-Monster Forums

TexasSP · 05.19.2009, 01:04 PM

6s is not the issue, people doing stupid things on 6s is.

A filter on a gas motor and a filter hindering airflow to an ESC is two different things.

You also cannot drastically increase the rotating mass on any vehicle be it nitro, BL, gas, or whatever and keep the same gearing setup. Everything is a trade off. You also don't want to run a monster truck geared for 60+ off road for 40 minutes straight with no cool off.

e-mike · 05.19.2009, 01:11 PM

sorry...my last post can hurt someone

,,,but we learn about each experience...so i think that you learn something...

05.19.2009, 01:37 PM

LOLOL, I like that filter thingy on the ESC! That noob shouldn't get a new MMM ESC by warranty...

_paralyzed_ · 05.19.2009, 06:37 PM

freezebyte-

I'm all for helping noobs. You've come to the right place if you want brushless advice.

However.... Your logic is flawed. You mentioned in your savage thread, for as much as you spent, you should just be able to take it out of the box and use it.

Well, these are toys, but they are the most highly technical toys I can think of. To think you can just pull it out of the box and use it.... well....the burnt mmm tells the story.

The failure was your fault, quite simply.

If you don't want it to break again stick around and read up. Best of luck.

05.19.2009, 06:39 PM

Quote:

Originally Posted by _paralyzed_

freezebyte-

I'm all for helping noobs. You've come to the right place if you want brushless advice.

However.... Your logic is flawed. You mentioned in your savage thread, for as much as you spent, you should just be able to take it out of the box and use it.

Well, these are toys, but they are the most highly technical toys I can think of. To think you can just pull it out of the box and use it.... well....the burnt mmm tells the story.

The failure was your fault, quite simply.

If you don't want it to break again stick around and read up. Best of luck.

Uh newsflash if you reread the link, ITS NOT MY TRUCK.

Aceldama · 05.19.2009, 07:50 PM

Excellent points made by everyone here obviously. This is the best forum for technical advice.

I think 'attitude' has a lot to do with these problems as well... and it's partially the fault of the manufacturers such as Traxxas and HPI. Everyone seems concerned about the reliability of their setup after they burn six new holes in it. Well, you need to PLAN for reliability from the beginning and that means gearing your vehicle to a reasonable speed. Not some internet e-dick speed like 65.

40 MPH is damn fast for a 10+lb RC car. Have some humility and start with gearing that will get you to 40. If things work out, from there you can slowly try to work your way up in speed while monitoring the temps of your system.

suicideneil · 05.19.2009, 07:52 PM

Noob 0, laws of physics 1.

Its sad to see a toasted esc and then the person repsoncible blame everything and everyone else, including castle for the failure, really is. He probably saw the link to this thread and is now weeping his heart out- we're a horrid bunch, but its true; learn from the old guys and ask advice before making changes- these arent ToysRus vehicles after all....

hootie7159 · 05.19.2009, 07:52 PM

i have that outwears filter on my sc8 as well but it was only because it was winter time and the track was muddy and wet....and i only used 4s....it helped to keep out the mud and my temps were ok (back to back 4s lipos runs of 17min each) but i definitely wouldn't use it if i was running 6s or 6s runs of 35+mins.....anyways...tell your buddy to check this site out..there is a TON of info about brushless and i only trust the guys on RCM if I have a question...rc-related or not :)

suicideneil · 05.19.2009, 08:11 PM

Oh but it is, but it is- use the Neu 1515 1y 2200kv, as thats the motor the FLUX is based on (Castle licensed the Neu design and built it en mass since Neu couldnt possibly produce enough to fill demand).

08:21 PM

Ah ok, now I see them.

Hmm, i'm getting this with stock 44/20 with Big Joe 40 series with 4S at 4.2v fully charged

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 20
Total Voltage: 16.8
Motor KV: 2200
Tire Diameter (inches): 6.4
Tire Ballooning (inches): .2
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.2 : 1
Total Ratio: 16.12041 : 1
Tire Circumference (inches): 21.36 inches (542.62 mm)
Total Motor Speed: 36960 RPM
Vehicle Speed: 46.38 mph (74.51 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

Or at 3.7v

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 20
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 6.4
Tire Ballooning (inches): .2
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.2 : 1
Total Ratio: 16.12041 : 1
Tire Circumference (inches): 21.36 inches (542.62 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 40.86 mph (65.64 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

suicideneil · 05.19.2009, 08:24 PM

Nope, try again- he said 6s lipo when he cooked his MMM right? and stock gearing?

Quote:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 20
Total Voltage: 22.2
Motor KV: 2200
Tire Diameter (inches): 6.4
Tire Ballooning (inches): 1
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 2.2 : 1
Total Ratio: 16.12041 : 1
Tire Circumference (inches): 26.39 inches (670.29 mm)
Total Motor Speed: 48840 RPM
Vehicle Speed: 75.71 mph (121.62 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

I spy an epic fail on the person responsible's part...

05.19.2009, 08:25 PM

No, thats for my future planned Flux setup, not his.

Aceldama · 05.19.2009, 08:29 PM

Quote:

Originally Posted by Freezebyte

No, thats for my future planned Flux setup, not his.

I'd try gearing for around 40mph to start, monitor temps, and then go from there.

suicideneil · 05.19.2009, 08:30 PM

Ah, I see. 50mph on 4s is a tall order for a truck that size- limit yourself to 40mph with only 4s, or step up to a 5/6s setup and gear accordingly- 50mph would be fine then, though the brand & quality of lipos is always key, as key as the gearing.

Its all good fun

08:37 PM

Quote:

Originally Posted by suicideneil

Ah, I see. 50mph on 4s is a tall order for a truck that size- limit yourself to 40mph with only 4s, or step up to a 5/6s setup and gear accordingly- 50mph would be fine then, though the brand & quality of lipos is always key, as key as the gearing.

Its all good fun

I just wanna keep stock gearing is all on 4S. After all this, I don't think i'll ever touch 6S. I run SMC's 6000mAh 28C packs and soon their 9000mAh 28C's

So basically its showing me this with stock 44/20 gearing, 40 series Big Joe's and fully charged 4S at 4.2v

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 20
Total Voltage: 16.8
Motor KV: 2200
Tire Diameter (inches): 6.4
Tire Ballooning (inches): .2
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.2 : 1
Total Ratio: 16.12041 : 1
Tire Circumference (inches): 21.36 inches (542.62 mm)
Total Motor Speed: 36960 RPM
Vehicle Speed: 46.38 mph (74.51 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

And the same with the nominal 3.7v charge on 4S

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 20
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 6.4
Tire Ballooning (inches): .2
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.2 : 1
Total Ratio: 16.12041 : 1
Tire Circumference (inches): 21.36 inches (542.62 mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 40.86 mph (65.64 km/h)
Effective KV Value: 2200
KT constant: 0.61 oz-in/A

Looks safe to me