danivida

Hi all.

I have a 29" fiberglass v-hull (it's a Scarab speed boat) I also have a Leopard WP SC8 120Amps (760Amps burst) ESC and a Leopard 3674 motor with 2650KV (with a max. continuous current of 110Amps). I also have 2 x 2S 30C 6000mAh batteries.

I would like to know if there's something I can do with this. I just want a funny boat, not racing, and I would like not to fry anything. I was planing to use it on 2S with an Octura X442 propeller, is it OK? ... If I wanted to go on 4S, which propeller should I use to avoid frying anything?

Kind regards.

Daniel.

danivida

Oops I've been around here during more than 4 years but this one is my first post

My name is Daniel, i've been boating for more than 15 years but it's the first time I try to do something related to Brushless and speed boats. (I am used to glow cars, glow airboats and live steam boats), so I'm a bit lost...

Goldenduff

I don't know boats but you are aiming for voltage x kv= 28000.

danivida

on 2S I would have 19600 rpm (max.)

on 3S I would have 29400 rpm (max.)

on 4S I would have 39200 rpm (max.)

So... 3S seems to be the most reasonable option but I already have 2 X 2S batteries [&o]

Is it a good configuration?: 2650KV 3674 motor + 120Amp ESC + X442 prop. + 3S 6000mAh 30C bat.

Is it possible to connect one 2S battery in series with a 1S battery? Do 1S 6000mAh 30C batteries exist?

*delete M i k e u p delete*

2 x 6000Mah lipos-30c in series on a 442 is close but a 440 would be best. Series at 14.8 on a 440 would run cooler. Weight of boat MUST be considered in this decision. This is a suggestion only.Don't forget motor cooling and esc. ESC- T-180 would be better. Now after rereading about 1S and 2S combo don't try unless you know exactly what you know about lipos. Best to havematching lipos as you have a decent boat, so why cheapen it with a cheap setup, doesn't jive.- Hold it!! You said in post 1 that u want to use 2S lipo 6000 maH right. Now it is 3S, new ballgame. Use 3S in a single pack cost plenty. Better off to use 2 lipos in parallel at 3000mah per pack for balance of cg and etc. This gives you 6000maH and you can place the lipos on each side of motor with a t-180 esc. The weight of 2 lipos at 3000mah each will almost weigh less than 1 6000maH at a high C rating of 50 c rating Higher the C rating, the weight increases. Do some checking around.-2650 on 3S =29,000 and at t-180 esc watercooled and 2 lipos run in parallel for 6000maH with motor can cooled and a 440 prop. When you have a lower kv motor and use a high voltage lipo, things run a little cooler and are easier on motor and esc. Hope this all helps. I'm retired and combo will be real close to what your posting mentions. Say when you get it running let all know how close it is for what your after, ok! I want you to succeed, cause rc boating is FUN and you can help others. Have a good day!

danivida

I'll go for 3S starting with a x440 prop.

THANKS A LOT FOR YOUR HELP DUDES!!!

I won't experiment mixing 2S and 1S Li-po. I'm a mechanical engineer: Li-po is like something coming from Mars to me...