Not enough speed

[sash]

Hi guys

can you please help me out.
I have purchased a leopard 4082 1600 kv 3500 watt motor that does not seem to be performing.
I'm running a suppo 125 amp esc with 5S 4800 45c & 6S 4500 30c with a Vantex F1 hull 36 inch.

Day temp 86 deg
After a 1 minute run :
Motor 95 deg
Battery 97 deg
Esc 158 deg

The battery was pulling 110 amps and only 1860 watt.
On 5s it clocked 36 mph & 6s a dissapointing 39 mph.
I was expecting 46 mph on 5s and 55 mph on 6s
Does anyone know how to test an ESC ?

Thanks

[Mattwarner]

What prop are you running? Although i am fairly new to this my guess would be you need to prop up, secondly that esc is gonna fry with that motor and 6s so I would suggest to upgrade first before doing anything else!

[Fluid]

Not enough information

Welcome aboard. We cannot help you if you don't tell us what boat you are running and what prop. Is it a tug boat? An outrigger? Is the prop an x432? Is it an 1465? Photos of the setup and the transom can be of value too.



.

[sash]

Sorry about that its a X445 on a Vantex F1 36" hull (cat)

[Jeepers]

still not a whole lot of info how, is the boat trimmed, loose or wet. like Fluid said a photos would help.

A wet running hull will be slow.

[Make-a-Wake]

Sounds to me like you need 2p to start with............that motor can pull darn near what the 6s batt can put out......... If the boat is trimmed well and gets up on the pad then you should be able to spin an x447, x448 on 6s, x450-452 on 5s

[Fluid]

There could be several issues. This is a "Y" wind motor and will like timing advance from 10-15 degrees at that amp draw. But that alone won't slow you down 10 mph. From the temperature data I suspect that you don't have a large enough prop. If the motor is spinning too fast (slipping) that can heat up the ESC since it has to switch at a high rate, but the packs and motor will be cool - as your temps suggest.

Running the outboard too high can do the same thing. That is a relatively small prop for a 36" tunnel hull, something like an x450 is more appropriate...but that may be too much for your motor. It is definitely too much for 6S. Really, that motor has a pretty high Kv for a 36" hull on 6S.

There are a lot more potential issues too, like the CG position, prop depth and angle, motor/shaft alignment, and the overall hull design. Some boats are poorly designed and will run too wet no matter what you do. I have no experience with the rather odd Vantec OB tunnel with its inboard motor.

How do you know how many amps it was pulling?



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[runzwithsizorz]

Hmmm, something is amiss here. the 1600kv Leo 4082 @ 6S should take this hull far beyond 39mph. I'll be watching this thread

I'll take " prop depth " for the win Alex.

[Alexgar]

Deff need a bigger esc that's way to many amps out of a 125 cheapie

[runzwithsizorz]

Deff need a bigger esc that's way to many amps out of a 125 cheapie

A vid of the OP's hull with a 60amp esc http://www.youtube.com/watch?v=M1f7j3e8Txw

[sash]

guys i've tried prop depth up and down with not much difference. The hull rides at 30 % wet but i've tried 70 % wet and no difference.
I use a Turnigy watt meter and garmin gps after all must adjustments to compare readings and speed.
Great handling hull but i do think its the esc holding it back.
Ajusted the timing 1 to 7 and 15 deg no difference.
Pulse width modulation from 8 khz to 16 khz no difference.
Ordered a seaking 180 amp esc hopefully will be here by Thursday and that will be the test.
I'll try to upload some pics shortly

[sash]

IMAG0122.jpgIMAG0120.jpgIMAG0119.jpgIMAG0118.jpgIMAG0117.jpg

[sash]

IMAG0116.jpg

[sash]

low res photos does any know the file size limt to up load ??????????

[sash]

Thanks Make-a-wake I'll be taking your advise on the props once i get that esc temp down to the motor level.
I also have a 26 " mono hull running a fsd 2500 kv on 4s with a 38 mm prop with a 70 amp suppo esc.
It pulls 44 mph. Temps are ok and it puts my new boat to shame.