Electric Newbie

[RCGasBoat]

Guys, need advice and help
Planning to convert a 48" tunnel to electric. This is what I have in hand. If I configure the motor to "Wye" and keep that below the ESC current rating, what are my 6S Lipo battery options and run time? If I configure to "delta" how damaging will be max current to the ESC as it is rated for 250A surge?............or am i missing something.

Thanks


Proteous X524 motor coupled to a MHZ NXT leg

Motor Specs as follows:
Watts Max Voltage Max Amps Resistance KV (RPM/volt) Max RPM
X524 3Y 6300 50V 126A 0.0141 600 30000
X524 3D 6300 28V 225A 0.0035 1,050 30000


Swordfish Pro 220 amp - 6s lipo ESC
Input Voltage : 2S-6S Lipo Cells
Continuous Current(Surge) : 220A (250A)
BEC Switching ; BEC Max 4A

[madmikepags]

6S is not enuf power for a 48" boat in my opinion. And you're Kv is not enuf for a 6S setup. With the 1050kv configuration on 6S you're looking at only 23,000 rpm on 8S you're at 31,000 and thats more what you want. with the 600kv setup you're gonna need 12S!!!!

[RCGasBoat]

Isn't 23000rpm enough? The RCMK gas engines only run at ~20000rpm......
Please enlighten me as I hate buying another motor or ESC...

[Fluid]

It is not just rpm, but electric motors are not gas motors. One of their advantages is higher rpm, most will want to run between a calculated 25,000 to 30,000 rpm. 6S is not enough voltage for your large boat, to develop enough power you will have to pull too many amps and will risk destroying your ESC. Watts (power) is volts times amps, increase one and reduce the other. Mike knows what he is talking about, he runs very fast 6S boats and understands their advantages and limitations. FE boats in your size range run a minimum of 8S and most are at least 10S. Tunnels are particularly demanding of power, requiring more for their size than most boats of their size. You risk disappointment running just 6S.



.

[RCGasBoat]

Guys please bear with my ignorance ....

With my current setup, what should I swap out?
Buy a higher capacity ESC I.e. a 12s rated ESC or a higher kV motor? (I can wire it to delta configuration for 1050kv isn't that sufficient?)

Suggestions please...... thanks

[RCGasBoat]

Guys please bear with my ignorance ....

With my current setup, what should I swap out?
Buy a higher capacity ESC I.e. a 12s rated ESC or a higher kV motor? (I can wire it to delta configuration for 1050kv isn't that sufficient?)

Assuming I wire to delta, 1050kv and run 7s I will be at 27000+ rpm but my current draw will be 243A! Or a runtime of <2mins for a 8000mAh pack.... what am I missing here.

Running 8s will exceed my max voltage of the motor..... hence another constrain.

Suggestions please...... thanks

[Fluid]

No one is born knowing about FE boats. I've been running them for over 25 years and I learn more all the time. In hindsight it would have been best for you to have asked questions before purchasing components. That didn't happen, so you have less than ideal parts. The "easiest" change is to get an ESC with a higher voltage rating. Running 8S (safe for you motor) you will have around 27,000 loaded rpm and a prop like an x457 or x460 may give you adequate performance with low enough amp draw to keep the ESC safe. But so much depends on how well you set up the tunnel - these are among the toughest boats to setup well. Good luck and let us help.




.

[RCGasBoat]

More question, wouldn't running 8s (29.6v) exceed the max motor voltage rating or 28v. Is that harmful to the motor??
What is a good HV ESC to buy???

If I start from scratch ....what would be then" ideal" motor /ESC combo for a 48" tunnel?

[Fluid]

The loaded rpm will not exceed the motor's max 30,000 rpm "limit". I wish I could recommend an ESC but since Castle has left the field I can't recommend the Swordfish - too many mixed reviews for me.


.

[RCGasBoat]

Got ya. Loaded rpm is below threshold.
Is the Proteus X524 I have a decent motor?
Scorpion 5035 looks smaller but more $$$
What is the largest capacity LiPo for 8S?? 8000mAh??

[Fluid]

I have no experience with the Proteus motors, just the specs. Motors of comparable quality seem to be Leopard and TP Power. I have several Scorpion motors, they are high quality but are amp-limited and rpm limited. The "normal" max pack capacity is 6000 mAh for 1P but going 2P can double the capacity.




.

[RCGasBoat]

Thanks fluid.
To make a 2p I have to wire 2packs of 8s in parallel.
Do I charge them separately as the packs are not balanced??

[Fluid]

It is probably best to charge them as separate 4S packs at first, then after a few cycles as two 8S packs
IF you keep running them together. Charging in parallel is usually not recommended.

[RCGasBoat]

Are there pictures showing me how to wire up 2 packs of 4s2p packs together??