mamba maxx? - RC-Monster Forums

**mamba maxx? -** 11.08.2006, 02:05 AM

what would happen if im out running with a mamba maxx on 14 cells and a 8 xl motor and my reciver pack dies:026: ???? would it het up or fry??

11.08.2006, 02:27 AM

...shouldnt do...It would probably shut-off before smokin'...bUt i dont think it would even do that...

Finnster · 11.08.2006, 12:11 PM

Why would it heat up or fry? Think about it a bit... It only runs the Rx and the servos.

The pack would just eventually get low voltage, after quite a while, and you would start to lose range and prob start to get some glitching and poor responce from the servos. You would know the pack is getting low and you'd pul the truck in to switch packs or pack it in for the day.

11.08.2006, 12:45 PM

ok good lol im just making shure.

MetalMan · 11.08.2006, 04:53 PM

If the pack gets low enough that the receiver no longer operates, the failsafe in the MM will kick in and stop the motor from spinning. It might take a couple of seconds for it to kick in (my RX pack got disconnected last night, and this is how long it too), but it will kick in.

neweuser · 11.08.2006, 06:19 PM

yeah, it'll just die out. You shouldn't have any heat issues with the rx pack, unless the cells are bad of course.

Finnster · 11.08.2006, 11:13 PM

Quote:

Originally Posted by E-MAXX Rock's

ok good lol im just making shure.

Its OK, chill baby...loosey goosey

:017:

11.09.2006, 12:45 PM

hahaha the school of rock............ yeh well i have had my speedcontrolls go up in flames while going down the street and then they glitch and it goes into my nieghbors house like 5 houses down and then starts burining so i had to rip off the battery and throw it down the sewer because it was leaking BIG time lol but yeh i just dont want any surprises

MetalMan · 11.10.2006, 01:24 AM

Quote:

Originally Posted by MetalMan

If the pack gets low enough that the receiver no longer operates, the failsafe in the MM will kick in and stop the motor from spinning. It might take a couple of seconds for it to kick in (my RX pack got disconnected last night, and this is how long it too), but it will kick in.

Actually, I have to render this post as not 100% true. Just a few minutes ago I was driving my Rustler, and broke the antenna tube (75mhz FM receiver). I wrapped the antenna around the base of what was left of the antenna tube, giving me an effective range of about 15-20ft before it would start glitchting. So I was going along, and then all of a sudden I no longer had control. The Rustler was fortunately going only about half throttle (but still at least 25mph) when it hit my neighbor's driving, and skimmed his car. I think it only skimmed the muffler, as I saw some sparks. I'm really hoping that I didn't dent anything, but I will have to wait until the morning to check.

The damage to my Rustler is dented capacitors, which happened when the Mamba Max was ejected after hitting the driveway and the truck hit the muffler.

To summarize, the Mamba Max won't cut off in case of a bad signal. My receiver was sending it ~50% throttle signal, which the Mamba Max did not refuse.

aqwut · 11.10.2006, 07:02 AM

MetalMan.... Man... that's not good at all.....

11.10.2006, 07:31 PM

wow i would just about crap a brick if my e revo hits a mail box or something lol well i guess i will find out

BrianG · 11.10.2006, 08:41 PM

Quote:

Originally Posted by MetalMan

...To summarize, the Mamba Max won't cut off in case of a bad signal. My receiver was sending it ~50% throttle signal, which the Mamba Max did not refuse.

Are you sure the signal was in fact ~50% throttle, or might it be random noise that the Mamba Max interpreted as 50% throttle? I'm just wondering if a failsafe would have helped here...

11.10.2006, 11:07 PM

can i use the fail safe from my nitro cars????? i could hook it up to the servos so when they wouls stop i would know to charge it up???????? i would hook it into the servos obviously, but would that cause interfearence between the speedy and failsafe???

BrianG · 11.11.2006, 12:21 AM

What servos are you going to hook it to? The failsafe simply monitors the signal from the receiver and if it sees that it looks like it isn't a valid singal, it interrupts the signal and outputs a preset signal to the ESC. Obviously, you'd set this to a neutral setting. So, you can hook it directly to the ESC. Once out of range, the failsafe should put the ESC into neutral.

The only problem with an external failsafe is that it monitors for an invalid servo signal. If the noise looks a lot like a valid signal, it will let it go to the ESC and who knows what will happen. A failsafe built into a receiver on the other hand looks at the transmitted signal so it's a little "smarter" IMO.

MetalMan · 11.11.2006, 01:06 AM

Quote:

Originally Posted by BrianG

Are you sure the signal was in fact ~50% throttle, or might it be random noise that the Mamba Max interpreted as 50% throttle? I'm just wondering if a failsafe would have helped here...

The Mamba Max is supposed to have a built-in failsafe of sorts (as do most ESCs), so that if the signal is lost the ESC will remove power from the motor.

If it was noise, then it was consistent noise. From the time when I lost control of the throttle to the time when it hit my neighbor's car, the RPM of the motor was not varying, so to me it seems like it couldn't have been glitching from noise.