prop question

[camarohrod]

is i was running too small of a prop would it make my esc run hot? my motor and batts r fine but the esc is getting hot. im new to the boat scene and dont really know much about this yet.

[ejimbo4]

Don't know much myself but more info is definitely needed .....motor size(kv),type of esc, type of batteries,prop size,type of hull and hull length?

[electric]

Just the opposite. More prop equals more amps equal more heat. Other things that heat up an esc are running a lot at partial throttle or short runs like in a small pond.

[electric]

And excessively long run times

[camarohrod]

its a skywing sw150a esc, 4s 20c 4000mah lipos, 40" genesis, no clue what the prop size is or what the motor is, here is a pic of each if it helps any. theres plenty of water coming out of the side of the boat so i know its getting plenty of flow.

[h2o 1]

The motor is a stock Genesis 36/74 2075kv.

[lenny]

Have any pictures of the insides of the cat set up and wires ?
And take the prop off and look for numbers and check that the flex shaft is free.

[camarohrod]

ok prop is a 435, the shaft may have had a bit of a bind in it so i loosened the motor and gave it more of a strait on shot and greased the shaft.

[lenny]

The shaft should turn with two fingers smoothly in open coupler on motor.
That is a small prop for that boat,
Need to see wire connector, No pictures yet ?
If that is a stock motor, I think they pull high amps and are not very good.

[h2o 1]

I would also go to a higher c rated batts.

[camarohrod]

well still the same problem, it starts falling off really quick on power and the esc is still hot, here is a pic of the whole setup but i have the boat in pieces right now. i run the 4s batts in parrelell also.

[camarohrod]

the shaft seems to turn really easily so i dont think thats my problem

[lenny]

I do not like the deans and to much different wire sizing going on to.
Go with 5.5 bullets all the way.
The esc is getting hot when running the boat in the water for how long and how hot.

[lenny]

You also need to have a 3/16 gap for your flex shaft from the back of the strut to the prop dog.
And take the wight washer off, You do not need it.

[camarohrod]

i have a good gap between the prop dog and strut, your goin to think im crazy but it gets up to 180+ after about 5 minutes of running, and ive done that read three times. what size wire do you sugest i use all the way? the batteries have 12awg coming out of them.

[lenny]

What part on the esc are you checking is 180 f,
Can you mark it with tape or some thing.
No wire, Just the 5.5 bullets in a Y like these,https://forums.offshoreelectrics.com/...llel-conectors

[srislash]

180? It still works? I'd hesitate to say your ESC is faulty.You haven't sucked enough juice to melt solder yet have you?

[srislash]

Just a minute,I just looked back over the thread and where's the water cooling lines for the ESC? What is it out of?I don't even see a cooling plate there.

[camarohrod]

yes it still works, and it is that hot cause i cant hold my finger on it or any amount of time, i measure it where the tip of the screwdriver is.

[camarohrod]

yes there r cooling lines, i dont know if you r susposed to put the cooling plate on the top or bottom but i mount the esc with the cooling plate on the botttom

[srislash]

I see them now.Did you add the plate?

[camarohrod]

no, came with the esc, it was wraped and everything when i got it.

[srislash]

Mmmm.Kinda got me other than faulty.Has it done this right from new or did it just start.

[srislash]

You should be having other heat issues if you are over drawing power.You can heat up motors with wrong gearing,I know this from my cars but then things are easy on the controllers.So that kinda takes away the small prop heating things up.

Is it that particular block part that you are pointing at that gets hot?

[camarohrod]

well i check it all around it and it varies about 10 degrees but its still supper hot, its done it since it was new, the motor and batteries stay super cool, highest ive seen on the batts is 92 and 99 on the motor but that esc gets smokin hot. but it still works every time, i dont get it either. im guessing the esc heating up is what makes me loose power so fast but i still cant figure out why its gettin so hot.

[lenny]

You may want to cut that shrink warp off and take a look to see what up.
My 120a swordfish was getting hot like that so time back and than I added some caps to it,
And the temps went down a lot.

[camarohrod]

caps?

[camarohrod]

and i have it times as low as it will go

[lenny]

Hears mine,Picture 004.jpgPicture 003.jpgPicture 007.jpgPicture 009.jpg

[srislash]

caps?

Capacitors help to regulate the voltage from the batteries.They can spike voltages. Do a search and enjoy the evening of reading.