Different wire guages bad?

[Tony]

Hi guys. My 32" cat is running strong so far. But, everytime i open the hatch after 5 mins run. There are some smokes coming from the batt. Motor was hot, so was the esc. The timming was set to HIGH on first run. But, now that the timming has been set to LOW. I thought it should solve the heating temp but it didn't.

Here's my 32" cat setup.
Feigao 9XL
Octura X642 prop S/B
Turnigy Sentilon HV 100amp with 12guage wires
3S 11.1V 2200mAh 2P connect to 14 guage Y deans connector

I watercooled the esc, and lower the prop a little today. So, lets see what the 3rd run will be.

[Doby]

Whats the C rating of your LiPo's??

[Tony]

Whats the C rating of your LiPo's??

Its a Thunder Power eXtreme V2 Lipo 2200mAh 11.1V 3S
25 Cont/50C burst (55A/110A)

[Steven Vaccaro]

For starters, You need batteries that are at least 100 amps continuous.

[NorthernBoater]

Check this site out for batteries. You will want to get some combination either with a single pack or running 2 packs in parallel that has at least 100 amp capacity.
http://www.rclipos.com/Elite.htm

[AntronX]

Get a data logger and tell us the amps you are pulling. You also may want to ditch that ESC and get Hydra 120 regular, non HV version. It has 4 times less resistance than Turnigy HV. You will have less heat in the ESC and more power going to the motor. Plus, you will have reverse! It will make gas guy's jaws drop when your boat gets caught in the weeds and you just back up and blow all those weeds out and keep going. About the wire gauge, feel how hot the wires and connectors get after full, continuous run. If they are warm - hot, then go with 10 gauge on everything and 5.5 mm bullet connectors. If they are cool - warm, then i guess don't bother. I personally like 10 gauge in my boat. I wish there were 8 and 6 gauge silicon wires available for longer runs in bigger boats.

[Tony]

For starters, You need batteries that are at least 100 amps continuous.

The lipo batt i'm using is 55 amps continuous. So, by running 2 packs parallel. shouldn't this already be 110 amps continuous?

[ozzie-crawl]

qoute: You also may want to ditch that ESC and get Hydra 120 regular, non HV version: that could be your problem as i run a 7xl on 4s with a 640 prop and can run 4 minutes with out issues. also run larger batteries to wich helps because if the batteries cant deliver the amps needed not only will the batteries suffer so will the esc

[ED66677]

if the motor is hot, assuming it is watercooled, then you're pulling way too much amp!...

Get a data logger and tell us the amps you are pulling

oh yesssssss!
3S on a 32"???!!! just my opinion!

[Steven Vaccaro]

I'm sorry! I missed that you were running 2p. 3s on 9xl isnt going to get you many rpms. Only in the 16k - 17k range. I would consider running 4s setup. Than drop the prop down to an x440 and start from there.

[Tony]

I'm sorry! I missed that you were running 2p. 3s on 9xl isnt going to get you many rpms. Only in the 16k - 17k range. I would consider running 4s setup. Than drop the prop down to an x440 and start from there.

So, 4S 100amp continuous? 1P or 2P parallel

[ED66677]

no matter 1P or 2P as long as the whole bunch of batteries can supply 100Amp! if you have one 5000mAh 20C that'll work for 1P, one 4000mAH 25C will also work, but if you have some 2500mAH 20C then you need 2P.

BTW a 9XL under 3S would spin 20500rpm unloaded under 4S it would spin 27400rpm unloaded.

[Tony]

no matter 1P or 2P as long as the whole bunch of batteries can supply 100Amp! if you have one 5000mAh 20C that'll work for 1P, one 4000mAH 25C will also work, but if you have some 2500mAH 20C then you need 2P.

BTW a 9XL under 3S would spin 20500rpm unloaded under 4S it would spin 27400rpm unloaded.

ED: Thanks for the infos. BTW, I have been using Thunder Power Lipos. What other lipo brand do you recommend?

[Steven Vaccaro]

BTW a 9XL under 3S would spin 20500rpm unloaded under 4S it would spin 27400rpm unloaded.

Why quote unloaded rpms? I was estimating loaded rpm. Th speed the prop turns is what we are after.

[ED66677]

You're right Steven, don't take any offense this was just to give him a view of the difference between 3 and 4S as it was very quick to calculate unloaded!
And again you're right Fecalc says 16-17K at prop, and he wants to be at least at 20k!