Esc and motor temps good.Lipos HOT!!!

[britscoot]

i have a temp gun but since they puff i'm thinking hot anyways so i dont bother taking a reading.

[domwilson]

How does it run? Do you have long wires? It sounds like you are drawing more amps than your batteries can provide.

[Flying Scotsman]

i have a temp gun but since they puff i'm thinking hot anyways so i dont bother taking a reading.

If they are puffing, toss those batteries in a safe manner. What were the voltages on each cell after discharge? I would not use those batteries again, just my 0.01 cent

Douggie

[BakedMopar]

That's because your running 1p. Run 2p and your hot lipos will be cooler and your wallet will stay heavier. Your batteries cannot keep up with the demand of your motor esc. That's why their cool and your batteries are hot.

[Fluid]

Had you told us 1P in the beginning we'd have had an answer for you immediately. Hot cells but cool motor/ESC usually means not enough pack capacity. The Castle motors draw plenty of amps. You could be drawing ~140 amps with peaks around 200 amps. I run a Neu 1521/1850 motor on 4S2P in my sport hydro and I draw an average of 180 amps with a larger S230 prop.

How much capacity are you using for each run? That will help determine your actual amp draw. If the packs "puff" then go down, they are not really "puffed" i.e. ruined. Actual pack temperatures would be needed here. Drawing packs down below 80% will usually heat them up pretty hot.

Two and a half minutes is pushing that racing setup. Most P Hydro heats are about 2 minutes long. Plus most folks have no idea how long they are actually running - did you use a stop watch to time your runs?

Bottom line, you do not have a setup appropriate for 1P and over two minutes of running. The only guys who seem to really get away with 1P and high power motors are running 45C/6500 mAh packs and limiting their runs.

The next thing to go will be your ESC - inadequate packs stress the controller a lot....



.

[britscoot]

my lipos do go down after puffing.
I still need to learn the whole mah draw thing.when i go to charge them after they have cooled
they read 3.85 per cell.What do i need to get a mah reading?
I have limited space so i will have a go at stuffing 2 x 2s in her.

Thanks for all the help!

[Fluid]

To find the capacity used just record how many mAh you put back into the cells after a run. That will help us to determine what is happening. 3.85 volts is about 50%.

You will gain nothing from using 2 x 2S1P packs in the boat, that is still 4S1P. You need 4S2P. Depending on where your motor is you may be able to put two 4S packs in front of the motor. Or 4S1P in front of the motor and two 2S1P packs on the sides. Here is what one racer did, but I don't know what capacity cells he used.

[britscoot]

ok i understand now....phew.
i need to run 2 x 4s in parallel to give me more mah.
that will make the hull very heavy...wow.

Its going to be a tight squeeze to get all that in there.lol

you have been very helpful Fluid.

thanks

[britscoot]

"That will help us to determine what is happening. 3.85 volts is about 50%."

is this bad or good?

[johnf]

Perhaps you could run a 2s pack on each side of the 4s pack?

[Fluid]

If you are only using 50% of your pack capacity then the problem is probably too high an average amp draw causing the heat. If you are drawing over 80% then the high heat can be caused by depleting the packs. Both results are related. But we really need to know how much mAh you put back in.

Yes, with 4S2P you'd better hope you never lose the hatch 'cause it will sink. This happened to Mark F in LA last month. He did find the sunken boat though.


.

[britscoot]

i'm going to do some experimenting and see what will work.
I thought having all that extra wire would cause heat problems.
will having more mah give me more speed and allow me to use a bigger prop?

[britscoot]

it would be very heavy for sure.
I'm going to invest in some hatch locks!
Will my charger tell me how much mah i'm putting in?

[johnf]

Whoops, missed Jay had already posted what I said.

[johnf]

Some chargers do. My hyperion does.