Motor voltage and kv

[mickgc29]

Been reading and looking at different options for new motor for new
62 inch mono build
And looking at say TP chart on the TP5870 Y as I may want to run
12s with the option to go higher
If I need to for less amps
Is it best to get the KV that is lower
Even if you are not going to run the higher voltage
Ie the Y5 is 585KV with a max
Voltage of 68 volts
Would this still run ok on 12s and 14s IMG_6142.jpg


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[Bande1]

not really. its too high of KV for 14s. fine for 8s-12s. Look at the 500kv SSS that OSE has on sale for $159. its a 56123 and can handle the same power as the 5870.

https://www.offshoreelectrics.com/pr...s-56123-v1-500

that will put you in a prop range on 14s of around 75-105mm total pitch (55-75mm size props; gas props)

[mickgc29]

Hi
Thank you for replying
This is the part I can?t understand with the TP motor as the 585kv as a max voltage of 68volts is this for max power
And can this motor be efficient if I only
Run it at 12s 44.4 volts
I am quite new to electric boats
This yea I have been running
A SSS 56-104 650kv
In a 58 inch boat pulling 190amps on
12s with a X460 type prop doing 58mph

I have a SSS 56-123 500KV this is what I was planning on using in the new build
But one of my race companions is
Going to run this motor in is new build
So I want to get something a little different even if it the new
SSS 56-133 or SSS 56-154

Reading pages and pages on here
You guys go on about LMT motors
And TP motors and that they are better
And more efficient

LMT is a 2 pole motor
TP is 4 or 6 pole depending on model
SSS is a 6 pole

Does this make much difference ?

I have emailed both TP and LMT to ask them
Regarding there options
LMT said 3080/8
and TP
Said it was out of there comfort zone
To answer and to ask on forums

I guess I am just going to have take a plunge and buy one and do some testing as I keep going round in circles
But any in put from you guys is greatly appreciated

Regards Michael


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[Bande1]

TP are kinda overrated. look at an electric system like this. MPH/KPH = wattage. wattage = amps (prop total pitch) X voltage.

everything comes down to wattage. What wattage you will pull all depends on load; drag, speed/prop size. 9,000w continuous on both motors = probably 70mph give or take.

a motor doesnt make power like a gas engine. a motor simply converts battery energy into rotational energy. So you look at them as to what they can handle without overheating. thats it. can the motor HANDLE what you want to do? does it have satisfactory efficiency in the conversion to rotational energy. number of poles and wind type doesnt really matter to the end user, perse. Stick with WYE winds though because you have timing adjustment flexibility.

And can this motor be efficient if I only
Run it at 12s 44.4 volts

efficiency has nothing to do with the voltage you are running.

So I want to get something a little different even if it the new
SSS 56-133 or SSS 56-154

why not the TP 100XL it is 100mm x 261mm and 72,000w peak power?

201691716120690.jpg


again the motor size doesnt mean literally anything. all that monster motor will do is slow you down from excess weight. Batteries supply the power in the system. The motor is simply rated to HANDLE the power you are asking from it. Lipo batteries can only sustain 150A-175A for a couple minutes. 350A for 5 seconds. and about 100A for 3+ minutes. So first we need to know how long you plan to run? are you doing 5 minute races? IF so then with 12s you can maybe output 4500w. a 5692 motor. IF you are racing heats you can maybe do 7000w. In which case your 56104 is fine. Is it overheating? if not then keep propping up until its getting too hot.


a big motor doesnt make you faster. It makes you slower, actually. Because its heavier. these 9000w motors are 14s-16s motors. Why? because 16s x 160A = 9000w
there is absolutely no need to go bigger unless you are running hot as it is.

[mickgc29]

Thank you
for the explanation
That makes a lot of sense
I understand it all way better now

We race for 7 minutes
Not flat out all the time
And the 12s 20,000 would do a race
Not pushing to hard

Regards Michael


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[fweasel]

A 62" mono is a big hull to push with a single motor. And now, you're racing for 7min, which means the battery capacity to finish the race adds a fair amount of weight to the setup. Member "Peter A" does a fair amount of offshore endurance racing. He would be a good person to get first hand suggestions from.

[Bande1]

I would put the SSS motor in it on 14s and expect 65mph max to last 7 minutes.