Boat newb need help for electronic

[Steeve.B]

Hi all,

I'm not new to rc. I've had rc truck and car since a few years and I know all the basic about LiPo, ESC, motor, etc. I'd day I'm fairly advanced in this reguard. But I'm a complet boat newb.

My brother in law exchanged and old LiPo battery for a Thunder Tiger Outlaw Jr. OBL boat (yellow color). That boat has a burn motor and esc. I don't know anything about propeller so I'm not sure if it's stock. Basically the plan is to get a really cheap electric brushless combo for this boat that will run on it's rather heavy (for this boat) 3S 5000 mah battery pack. We are not aiming for stellar performance at all we only wan't maybe 20? 25? 30 mph. Is that asking a lot for a boat. We know the battery will probably hurt the handling but we just wan't to bring the boat to a local beach on a river side (with no current) and cruise the boat slowly and borrow it to the kids, girlfriend, etc. So really what would be the best cheapest combo that will run on 3S for this purpose? I beleive the stock motor is 28mm diameter so we want a motor that fit the stock motor mount if possible. Also how can I identify the propeller? I'm guessing you will wan't this information anyway? It's a red propeller and it don't appear to have any writing on it.


Thank you for any help that will be provided.

[Meniscus]

Welcome to OSE! The biggest challenge for using a heavier battery in a mono-hull will be the balance from the front of the boat to the back and from side to side. Since this model is 28" long, it may be a good candidate for 4s1p as an upgrade. That would allow for two 2s packs to be put on either side of the motor. This would resolve the issue of balance and allow for many prop options. Depending on the prop choice, it could cruise around happily at a lower speed such as 20 mph with lesser concern for excessive amp draw. At the same time, it would allow for a larger prop to have some fun at 35-40 mph range.

There are a lot of motors available in the size range that will fit the stock motor mount. Try to choose a motor that has a longer can if possible. With cars/trucks, the wheels slip when there's too much torque applied. This is not the case with boats and as a result, we end up seeing a more constant and heavier load on the components in many cases.

It may be helpful for others to make suggestions if you wouldn't mind posting a picture of the inside of the boat. If you are willing to change the motor mount, you may find that you could use some of the same components you use in your trucks as long as you are reasonable about the size of prop you put on the boat.

Hopefully this is helpful and I'm sure that collectively, the folks here on the forum will be able to make some good recommendations to support what you want to achieve.