amp to watts on motor

[jjrctech]

if you runing say 6s 22.2v on 1577kv neu 1521 3500w max

what would be the amp draw??

at 22.2v , 25.9v and 33v??

Thanks

[Make-a-Wake]

Not enough info...............a HUGE prop would be alot of amp draw...........tiny prop low amp draw................etc............

[jjrctech]

is there a online a online calculator where it would tell me , I would like to play with numbers, I am think about run 5017/3 ???

[Chilli]

There are just too many variables. Hull type, size, prop, setup.

Give us your whole set up and someone here will give you a pretty good estimate.

[lohring]

The allowable current would be 158 amps, that is 3500 divided by 22.2. The actual current depends on the things mentioned above.

Lohring Miller

[jjrctech]

The allowable current would be 158 amps, that is 3500 divided by 22.2. The actual current depends on the things mentioned above.

Lohring Miller


so would a 180a T ESC be good for this ?? setup at 6s 1521 1577kv??? Prop 5017/3?? 44"cat c5000??

[video200]

that motor is to small for a 44" cat.
that prop is to much for that motor in almost any boat and would most likely melt a 180 within minutes.

just my $ 0.2

[Steven Vaccaro]

that motor is to small for a 44" cat.
that prop is to much for that motor in almost any boat and would most likely melt a 180 within minutes.

just my $ 0.2

agreed.

[jjrctech]

agreed.

Really 2 x Neu 1521 1577 would be to small for a 44" Mystic ??? what would be better??

[Fluid]

You need to re-think your goals here. A single 1521 is not enough motor for a 44" cat, and 6S is on the bottom end of acceptable power as well. The two 1527/1Y motors you were selling would be great in that hull as a twin setup. A club member used them in a HPR build and that boat performed very well. Finding the right props was his biggest problem.

- What do you expect the cat to do, sport run, race, SAW?
- What speed and run time are acceptable to you?
- What is your budget for this project?
- Do you already have the cat hull?

Don't try to re-invent the wheel here. Get proven setups from folks who have ACTUALLY built and run large boats - not recommendations from those who think they know what might work. Follow the wrong advice and you'll end up spending a lot of money and not have a reliable boat.


/

[jjrctech]

I was think the 2 x Neu 1527 1250kv would be to strong for this boat 55455 I already have the boat. this is my 2 build, first one was a 54" FOUNTAIN ( http://www.youtube.com/watch?v=_cxR6yDRJXw )which run in the low 60mph , so i wanted to get this one in the 80mph recommend setup wise???

[jjrctech]

I was try to copy mike76 setup mhz mystic C5000 JBS racing 44,8''

2x leopard 4082 2200 kv
2x esc 180A turningy + cap bank
2x 6S 5800 turningy
2x propshop 5017/3

he show 84mph

I was thinking the 2x Neu 1521 1577kv would be about the same or better then the leopard 4082 2200 kv ???

[Fluid]

You didn't state this was a twin build in time for my post - several of us assumed you were using a single motor. Two 1521s will work as long as you are careful in the build and don't run too wet. The 1577 Kv motors on 6S will give you good speed, start with props like the K57s and expect high-60s with a good setup (strut/CG). K63s cut to 52-55 mm diameter should up the speed into the high 70s or more. Once you get close you can get metal props, the carbon fiber props will last long enough to get in the ballpark. Watch those Turnigy packs with Neus, those motors will pull more amps than the Leopards will and IME the "C" ratings seem inflated.


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[jjrctech]

[QUOTE=Fluid;339359]You didn't state this was a twin build in time for my post - several of us assumed you were using a single motor. Two 1521s will work as long as you are careful in the build and don't run too wet. The 1577 Kv motors on 6S will give you good speed, start with props like the K57s and expect high-60s with a good setup (strut/CG). K63s cut to 52-55 mm diameter should up the speed into the high 70s or more. Once you get close you can get metal props, the carbon fiber props will last long enough to get in the ballpark. Watch those Turnigy packs with Neus, those motors will pull more amps than the Leopards will and IME the "C" ratings seem inflated.

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Do you think the 2 x neu 1527 1250Kv would make the boat faster even with that motor weight alot more?? and would be a better pick becuase i already have them??

I would run the neu 1527 on a Swordfish 240hv ESC with hyperion battery

[Fluid]

The problem is that the 15271/1Y motors do not have enough Kv to reach 80 mph. You'd need props with about 4" of pitch to go that fast, or you'd want to run on 8S. The 1527/1.5D would be better from a Kv standpoint. Don't worry about a few extra ounces of weight in a boat that size with that much power.



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[jjrctech]

I could run 8s , what would you say is the max cell i can run 10s on the neu 1527 1250kv?? but 10s would weight alot does this make a different??


What would be the advantage of running 8s on the 1250kv motor over runing 6s on a 1500kv?? seem the 1500kv would be faster on 6s and cheaper on battery wise??

Thanks

[Fluid]

I could run 8s , what would you say is the max cell i can run 10s on the neu 1527 1250kv?? but 10s would weight alot does this make a different??Eight S would be maximum on the 1250 Kv motor, that would be about 33,000 rpm on the water. You will have plenty of power for the small amount of extra weight.


What would be the advantage of running 8s on the 1250kv motor over runing 6s on a 1500kv?? seem the 1500kv would be faster on 6s and cheaper on battery wise??Running 8S allows you to have the same power at lower amps, or more power with the same amps. For larger boats it is usually better to run more voltage. Efficiency is higher and the amps needed are lower. It is just easier on the whole system. And 8S with the 1250 motor will be faster than 6S on the 1500 motor - 33,000 rpm versus 30,000 rpm - at lower amps.



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