ESC and Motor Setup Help

[Jacques]

Hi Guy's Hope Some one can Help me with this Problem , I have been Burning Out ESC every weekend and starting to feel the cost now.my latest Setup is as Follows:

29" Cat Made From Balsa and Plywood
ADS300XL Water-cooled Brushless Outrunner 3000kv 400w
40A Water Cooled Brushless Boat ESC
45mm Prop
3Cell 11.1V

Ran this Last Setup for about 10-15 Sec and Boat Cuts Out in Water after retrieving it from the water everything looks fine but no Pleasure . got home Tried another Spare ESC and Got Power to System .
Please Advise on What setup I should use for this Boat . it is a home made Copy of the Genesis Cat.
Please Advise on Watercooled Brushless and ESC which ones and where I can Purchase Them From.

[Fluid]

The first problem is the motor - it is tiny and has a pretty high Kv for 3S. Second, the prop is too big for the motor. Third, the ESC is really too weak for a boat application.

Okay, what can you do with what you have? The easiest is to get a much smaller prop. A prop with a diameter between 32mm and 38mm is best for your motor. This may allow you to get the boat running, but the motor and ESC are still too small for a boat that size. Assuming you want to stay with 3S power, I will recommend parts which you can get here on OSE.

The 2290 Kv version of this motor:
http://www.offshoreelectrics.com/pro...o-3650&cat=148

This controller:
http://www.offshoreelectrics.com/pro...f-sword-120%2B

One of these propellers:
http://www.offshoreelectrics.com/pro...?prod=oct-y534
http://www.offshoreelectrics.com/pro...?prod=oct-x438

You can get cheaper products elsewhere, but I don't recommend them. Others will respond with their suggestions.


.

[siberianhusky]

The prop is too big for that motor, that motor is too small for the boat and the esc doesn't have enough capacity.
What is the capacity and C rating of your battery?
You'd be better off buying a used Aquacraft or Proboat 1800kv motor/esc and buying a pair of 2s 5000mah batteries at least 40C if you're going budget batteries.
All my boats are in the size range of yours including a couple of cats. Your setup is just not up to the task. More applicable to a boat roughly half the size of what you currently have.
I just checked a couple of data logs from my Motley Crew, it pulls over 1100 watts at times, same size boat, m445 prop (45mm), that's just about 3x what your motor is rated for.
Or follow Fluid, he posted while I was typing, he knows his stuff!

[Jacques]

Fluid/ siberianhusky

You Basically got me in Tears here...been busy with this Boat for about 3 month's now ,been to every hobby shop we have within 150km from me no one knows and the local boat club all the Guy's are running Nitro.

You have given me alot of help

will i be able to stay with my 3cell 2200mah and 45mm Prop on this Setup You recommended?

Once again Thanks for the Great Advise.

[lomdel]

45mm is a BIG prop! Go down on prop and up on ESC and motor as Fluid suggested. I would also ditch the 3S and either go 4S or even 5S dpending on the motor's kv. Multiply the kv with the batt volts and try to get in the 30k range...

[Jacques]

The prop is too big for that motor, that motor is too small for the boat and the esc doesn't have enough capacity.
What is the capacity and C rating of your battery?
You'd be better off buying a used Aquacraft or Proboat 1800kv motor/esc and buying a pair of 2s 5000mah batteries at least 40C if you're going budget batteries.
All my boats are in the size range of yours including a couple of cats. Your setup is just not up to the task. More applicable to a boat roughly half the size of what you currently have.
I just checked a couple of data logs from my Motley Crew, it pulls over 1100 watts at times, same size boat, m445 prop (45mm), that's just about 3x what your motor is rated for.
Or follow Fluid, he posted while I was typing, he knows his stuff!

Thanks for the Advise I went with Fluid's Suggestion. Nice to finally have the Right Guy's with the Right Knowledge.

[Jacques]

Thanks Fluid.. I have Ordered as per Your Specs ..Now Comes the wait for my new Toy's.
why would lower Kv be better for my Boat than Higher Sorry new to this.

[lomdel]

With the 2290kv Leopard motor you will get just over 33k rpm theoretical from a 4S setup which would be more than enough for you. Low kv + high volts = low temps, high kv + low volts = high temps and danger of blowing stuff up.
I would've gone for the bit longer http://www.offshoreelectrics.com/pro...74&cat=148 2200kv motor and 4S setup, but that's just my 2cents... I have huge amounts of respect for Fluid's replies on these matters.

[ray schrauwen]

I suggest if you do invest in a motor that you try to stick with "Y" wind motors. They are easier on speed controls.