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[surabaya]

Hi All.
I had a cheap Hong Kong 50 amp Esc in my Antje II, worked perfect. I needed a pair of esc,s for another project and since I already had matching cheap HK esc I bought a mtronics viper marine 15 for the and swapped it.
When I ran the boat this weekend it was pooh , kept stopping and starting , as though cutting out.
It,s running on 6v sla battery. No separate receiver battery. I didn't change anything else other than the esc.
Any ideas.
Maybe I should buy some more Hong Kong ones, they have never let me down.

[Martin (Admin)]

Viper controllers are usually rock solid... did you do a range check?

[surabaya]

Thats why I picked Mtronics
Range about 20 ft, didn't dare go further.
Cheap esc perfect control.
Someone once told me that when voltage dropped to about 5v esc or bec would cut out. Could this be the problem, although HK esc has bec too.

[PMK]

See if it improves any by running the receiver on its own battery.

[Umi_Ryuzuki]

The Viper marine have a heat cut out, so if they are being over drawn, then they
will self protect....

If that is not the problem, and you are running a pair, did you pull the center wire out of
the receiver plug on one of the ESC? This prevents feed back from both BEC running into
your reciver.  The red wire needs to be pulled out of the plug, or the switch needs to remain
in the "off " postion, or the switch needs to be cut off of one of the  ESC.

...

[FullLeatherJacket]

Ah! The old MTroniks Mamba:

1. Battery low on charge.
2. OK with no load but stick props into 'oggin and current goes up.
3. Battery voltage goes down to below threshold for BEC regulator (probably 5.5v)
4. BEC cuts out.
5. Motor stops.
6. Load decreases so voltage increases.
7. Motor starts.
8. Go back to step 2.

(Anyone know a good melody to fit these words?)

Solutions?
Charge the battery.
Check the running gear for friction.
Check the current drawn on load - your motors may be over-propped.
As PMK says, disable the BEC and try with a separate Rx battery.

Doncha just LURV BEC?? 
FLJ

[jabba]

hi there
sounds like your esc is overheating ,
why not do a amp check with the boat in the water.
hope this helps.
  jabba

[malcolmfrary]

I had a cheap Hong Kong 50 amp Esc in my Antje II, worked perfect.  I needed a pair of esc,s for another project and since I already had matching cheap HK esc I bought a mtronics viper marine 15 for the and swapped it.

How much current is being pulled?  Original ESC = 50A.  Viper 15, the 15 refers to a max of 15A.  This could be a clue, as even 50 oriental amps might be more than 15 viper amps.

[Shipmate60]

What motors are in the model and what size props (plastic or brass) and what voltage are you running?

Bob

[andywright]

I have a spare Mtroniks one ,tried it in my Nangee tug, on full throttle the engine just dies, you then ease the throttle a bit and all is OK, set the limit on my throttle at 120% and all OK, but occasionally tou need that full blip, so swapped it back to my electronise, best ESC's going I think.
Andy

[malcolmfrary]

Seems to be a thing with Vipers - if the "full speed" command from the stick is more than what it is expecting, it doesn't think to itself "He wants more, he can just like what he's getting", it thinks "He wants more than I can give, he aint gettin' nuffin'".  I had this and did a re-set-up making sure that I was using full stick travel plus trim tab and things worked OK after.

[Martin (Admin)]

... unless it's detecting 'overload' and shutting down....

[malcolmfrary]

I suspect that the motor I was using would struggle to pull as much as ten amps from a 6 volt battery, and seeing as the boat at the beginning was of similar size and performance, neither would that, so I was assuming that it was the internal program deciding that the longer pulse was invalid, rather than the ESC heating up.  Add to that the fact it was stone cold.