New but Building a 60inch offshore boat

[mickgc29]

Hi Guys
New to electric boats but I race 2 stroke petrol
But now we have a electric class so I want to build a 60inch boat to race offshore in the sea
And motor I have got to try is a 56/123 500kv
Running on 12S and boat will be heavy
As anyone got a idea on what prop to use
I only need to get about 50-55mph
So no need for out and out speed and we race for 7 minutes

Regards Michael

[Bande1]

what voltage will you use?

[mickgc29]

Hi
Sorry yes that would help you guys 12s
And boat will be quite heavy

[Bande1]

so theres a bunch of prop choices. a simple starting point would be an X465 or X467, maybe even a X470
https://www.offshoreelectrics.com/pr...?prod=oct-x465

another is an ABC 2316-17-45

a 3 blade might also be a good choice. its kinda hard to nail down exactly without knowing what real RPM would be. I would expect to buy 2-3 props to dial in runtime and heat.

[mickgc29]

Thank you I will try a 65mm and see what amps the motor pulls with this and see what kind of speed I get

What?s the best data logging setup
I can only find the one from a German company
https://www.sm-modellbau.de/UniLog-2
Any thoughts on this system ?

Regards Michael

[Bande1]

you can get standalone data logging through the hyperion emeter2. Its very inexpensive. most large esc's that you need should have it internally. I dont know anything about the German one there.

[monojeff]

Hello and welcome I have moved your thread to the boat building talk section

[Peter A]

Ok so having actually built and raced electric offshore boats I can give you some actual experience. My first boat was a 42" HK Osprey which ran 10s the first year with a TP4060 540 kv motor and detongued prather 245. Batts were 4s & 6s 20,000 mah in series and would do 20 mins runtime at 65-70 kph. Second year I change to a TP 4070 440 kv motor and ran the same set up other wise on 12s.
I built a second boat which was a 45" hull and ran the 440 kv motor on 12s. On a ABC 2314/4 it would run at 90 kph and do two heat races or a 10 lap race on 6000 mah packs. The best run I did on 12s with 6s 6000 mah panther graphenes was over 8 mins on a Graupner carbon prop at a max speed of 56 kph.
Esc was a Seaking HV 130.
You have a much bigger boat, maybe too big, but if you carry the battery capacity then you can easily do the 7 mins. Prop size you will have to test with, OSE stocks the Graupner K series props and are good for testing to figure out a size, and cheap. Also two blade props are more efficient than three. Prathers are good, especially if you detongue them.
Do not worry about weight, it has little effect on the top speed. I can tell you that from the testing that I have done in the past. With the size boat you have the extra battery weight will be negligible.
While amp draw is important, it is the total mah that you use for a 7 min run that matters. You want to keep your amp draw as low as possible, 60-70 amps. On 12s this is still 3.5-4 hp equivalent. At 70 amp current draw you can do your 7 mins on 10,000 mah, so that is 12s 2p using 6s 5000 mah packs. The more capacity you have the higher the current draw you can use and then the bigger the prop and higher the top speed.

[mickgc29]

Thanks Peter

The batteries I have are 16,000 per 6s per side
And 20,000 6s per side
I can buy more for next year
Racing in the sea you need weight and size
This year I ran a boat I bought second hand with a 56/94 650kv which was reasonably
But I want to build my own boat
Now I have done a little bit with this class
I went with a
SSS 56/123 500kv motor
Going to get a 400amp esc
the boat I plan to build is 62 inch
MHZ No Mercy

But I can change anything in the setup if there?s options


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