Need Professional Help.

[BigJohnnyNC]

I purchased 3 new in the box Graupner Electro Vee Hulls.
They are 28.5” long with a beam of 8”
I need suggestions for a Brushless set up?
I’m not looking for a racing setup, just fast enough to have fun with my kids.
All three are going to be set up identical so we can race each other

Motor size & KV
ESC size
Lipo battery cells, Mah & C-Rating
Surface or Submerged drive
Prop shaft size
Prop size

[stadiumyamaha]

In my opinion I’d set it up something similar to an aquacraft revolt.
3656 2000ish kv
Seaking 120 esc
4s2p or a single 4s 50c plus
Tfl stinger and rudder
3/16 shaft
442 prop
Should rip, stay cool and be very durable.
Jmo

[Jesse J]

Wow, that was my first FE boat!
Are you going to use the steerable outdrive? This will make them quite squirrelly, but are cheap and relatively simple.
A fixed strut or a stinger might be a better handling option. I’d be mounting it where the center of propshaft is 3/8” above the base of the vee, so it will be surface penetrating.

The above recipe sounds reasonable. The boat can handle the weight. We used to use 12 round cells, a brushed motor on a 3:1 gear reduction and a 42-45mm prop. Probably got mid to upper 20s.

With all the lift those hulls have, you don’t need a lot of power.
I’d be more inclined to try a 2700ish 36mm motor on 3S2p with 40mm prop. And maybe go up to a 42 if needed.
Maybe show us a picture of what you are starting with?

If you ever want to sell those steerable outdrives, keep me in mind.

[Speed3]

The revolt setup would be perfect for that boat.

I would like to point out that the revolt motor is an 3656 1800kv motor.

The x442 would be an excellent prop.

4s lipo 5000 mah 20c or greater.

Surface drive.

[BigJohnnyNC]

I have a ton of 3S 5000 40c lipo’s from my airplanes!

Should I increase the KV to use them or use them in series for a 6S setup & reduce KV?

[Speed3]

You can run a single 3s with the suggested setup. The electro vee is a little smaller than the revolt and it probably have more lift. I would suggest 3s with the x442 or you can even get an m545 for 3s running with the suggested aquacraft 3656 1800kv.