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10-16-2005 11:37 PM  12 years agoPost 1
crewchief_432

rrNovice

Groveland,fl.

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I have a cc pheonix 25 with a warp 4 bl motor with a 14 tooth pinion and TP 2100 3 cell battery on a t -rex. around 4 minutes into the flight the motor stops and some times I have to unplug the battery to get it to restart. other times the esc resets all by it self. does this sound like a bad esc or do i need a external bec. I still have control of the rest of the heli when this happens. also I have the esc set as follows 9 volt cutoff, softest cutoff, curent limit off. If I need a bec what is a good brand and where is a good place to get it. thanks, Jeremy

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10-17-2005 08:50 PM  12 years agoPost 2
Rob_T

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If you still have control over other functions, it's not a BEC problem, so adding an external BEC wont help.

Sounds to me like the ESC thinks your battery voltage went below the cutoff. That might mean the ESC is being over sensitive, or it might mean your batteries aren't holding up to the current load. (It might also be current limiting, but my guess is that it's more likely to be cut-off voltage,make sure the current limit is set to "insensitive" or "off" just to be sure...)

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10-18-2005 12:47 AM  12 years agoPost 3
crewchief_432

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Groveland,fl.

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The current limit is set to off. Should I set the cut off limit to a custom setting of about 8 to 8.5 volts. do you yhink that might help.

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10-18-2005 04:07 AM  12 years agoPost 4
Rob_T

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For the purpose of trying to find the fault, I'd say set a lower cut off voltage, or even disable the cut-off completely. But then be very carefull not to keep flying once the power starts to sag- most 3S powered helis cant keep enough headspeed to stay in the air at the point where you're damaging your lipos, so as long as you have good flight power left its usually safe for the batteries.

If the power starts to drop at about 4 minutes then the problem is the batteries (or maybe the motor itself)- if you get the 10 minutes or so I'd expect from that setup the problem is the ESC being over sensitive. In that case you might want to try adjusting the threshold a little lower than 9V, 8.5V ot 8V should be OK in that case. I think on my Shogun I have it set for 7.2V, but I always land when the headspeed starts to drop, so I never fly to the cutoff voltage (I'm not actually recommending you set it that low, but it can be done...) I think electrical noise sometimes fools the ESC into thinking the battery voltage is lower than it really is.

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