Need help!

[ChrisHerzog]

Ok, for starters I know little about elec boats and NOTHING about one this size. Also this is strictly a play boat for him and nothing more.

A friend of mine brought me a cat boat and asked me to convert it from gas to elec. Along with the boat, he gave me…

A Seal Series ESN:300A IPTO 6s - 14 s
And a TP B2002 8.38kv motor

Im assuming that I can buy two 5s 5000 lipid and run the boat on 10s without any problems, correct?

If so what about two 6s packs and run it on 12s, would this be OK?

Also what butt connectors do I need between the ESC and motor or is it better to solder these connections?

What batteries connector should I get between the ESC and batteries?

Finally, where should I start out with prop wise. I do have it set up with a 1/4” shaft in this Cat boat.

Thanks in advance for any advice. I would like to get everything ordered this week ASAP to get this thing out of my shop.

 

[rhomodel]

Chris, I can't find any reference to the engine you specified. However a bit of math will help here: usually the max rpm of an electric motor is 50000, your engine is 8.38kv, meaning 8380 rpm per volt. 50000 rpm/ 8380 = 14,7 volt to have it run 50000 rpm.
The voltage of 12 S pack ( or 2x6S) is 12x3.7 Volt= 44,4 V. Way too high
Half of this, 6S is already 22,2Volt, which I think is already over as well.
What I think you can do is 14,7 Volt / 3,7 is a 4 S pack

So after google I could find a TP 2020 motor, but that is for mini eco, tiny tiny motor that can not push a former gas cat.
Can you check the specs of the engine, may be a picture next to a soda can? Normally the size of engines that push a gas sized boat are a small soda can size and their kv is a lot less: 0,800 or so.
Link to TP engines: Basic » TPPOWER

The ESC can handle this easy: 300A 14S is 15540 Watt max, or about 18 hp.

 

[ChrisHerzog]

Thanks for the reply and here you go! Also it might be 838kv motor not 8.38, it’s hard to tell because it’s hand written and faded some.

 

[ChrisHerzog]

I’m thinking this is what I have… this is all off the OSE web site and since the ESC came from there I figured the motor did to.
The can is also 55.89mm x 91.44mm and has a 8mm shaft coming out of it.

I wish they put better numbers on these things!!

 

[Martin Hamilton]

That would be 838kv, their is no way a motor of that size would be anywhere even close to 8380kv.

 

[rhomodel]

Yeah this is 838. So with the documentation were they advise 25000 rpm, simply devide the rpm by the kv and you know how much volt you can run. So around 30 Volts, or 8 S.
Buy batteries that can handle high amps, so high C value: 40 minimum and you'd probbaly need around 7000mAh for some decend runtime..

 

[ALLAN YUEN]

Yeah this is 838. So with the documentation were they advise 25000 rpm, simply devide the rpm by the kv and you know how much volt you can run. So around 30 Volts, or 8 S.
Buy batteries that can handle high amps, so high C value: 40 minimum and you'd probbaly need around 7000mAh for some decend runtime..

Lot of drain amp and become hot lipo cells also big brushless motor possible burn out or cramp ”brake”

 

[ChrisHerzog]

I was talking with Steven at OSE today and he told me that the ESC that I’m installing is a good one and that they usually run this motor on 10s.

 

[longballlumber]

I was talking with Steven at OSE today and he told me that the ESC that I’m installing is a good one and that they usually run this motor on 10s.

BINGO! Steve has provided you good advice. 10s is the right Voltage. Start small on prop and work your way up.

 

[ChrisHerzog]

BINGO! Steve has provided you good advice. 10s is the right Voltage. Start small on prop and work your way up.

He suggested to start off with an x455.

 

[Martin Hamilton]

Yep 10s is right for this 838kv motor all day long = 31000 rpm unloaded.

 

[Hydro Junkie]

He suggested to start off with an x455.

Guys in my club run 8S with a X457 so you might want to have one of those as well

 

[ChrisHerzog]

Guys in my club run 8S with a X457 so you might want to have one of those as well

What kind of speed are they getting with a cat boat? Just ball park is fine.

 

[Hydro Junkie]

They run 1/8th scale hydroplanes and they are comparable to nitro scales as far as speed goes. They are limited to 57mm props by the rule book so it's hard to say how much faster they could run with a larger prop

 

[ChrisHerzog]

They run 1/8th scale hydroplanes and they are comparable to nitro scales as far as speed goes. They are limited to 57mm props by the rule book so it's hard to say how much faster they could run with a larger prop

That’s cool. That will be fast enough for what he is looking to do with this cat boat.

 

[T.S.Davis]

Great motor. Beast mode. Should turn a lot of prop once you get it figured out. Not legal for scale in either organization.

10s for sure. Did I miss which cat it was going in?