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brushless recomendation

Old 09-29-2010, 04:47 PM
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andybenton
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Default brushless recomendation

hey all, im looking for a good brushless set up to run in a 25" fiberglass deep v hull.

something nice and cheap would be pretty awesome.

to be honest, when i look at marine brushless stuff, and its not labeled 540 or 550 can, i have no clue how big of a motor im looking at, also, idk what Kv rating would do well, or what amp esc.

my best efforts at a rough estimate were something aroung 3500 kv, and an esc around 150 amp. on 3s 4000 mah lipos.

any corrections are welcome, and recomended lol. id like the help. im familiar with electrics, but not familiar with brushless too much yet., i understand the basic theory, i understand the differences,
but picking a kv, and amp rating on the esc are a bit rough.
and i know kv relates to rpm per volt, and pretains to the motor.


Old 09-29-2010, 04:57 PM
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BACKEMF
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Default RE: brushless recomendation

What is your "cheap" budget? There are some excellent motors on sale at Castle's clearance sale: http://www.castlecreations.com/promo...clearance.html

or a 2000kv leopard motor: http://www.hobbypartz.com/77p-lp4074-2000kv.html

These motors are typically 4S or 5S motors. If you haven't bought batteries yet, then these are great motors and you will not find motors priced better anywhere in terms of quality for your $$.

You can buy smaller cheaper motors but, I think you would be very happy with either a 1512, 1518 or a Leopard 4074...

Just my .02 worth...
Old 09-29-2010, 05:04 PM
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Default RE: brushless recomendation

Hi for a fast boat you want just about 30,000 RPM so using 3S you would need 2600KV 2700KV should be good to go!
Old 09-29-2010, 05:08 PM
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andybenton
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Default RE: brushless recomendation

ive allready got batteries, ive allready got the hull, just need the motor, esc, and some other misc stuff.
Old 09-29-2010, 07:11 PM
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Default RE: brushless recomendation


my best efforts at a rough estimate were something around 3500 kv, and an esc around 150 amp. on 3s 4000 mah lipos.
How about some details about the hull, don't make us guess then give you the wrong recommendations. Brand, pics, etc. would be good. Also, how much can you spend - how cheap you want to go is meaningless. Without this info:

The ESC rating is good. Too high a Kv on the motor though. Particularly since you are a beginning boater, you will want a Kv around 2300-2500 for 3S. More may be faster but also more likely to burn up your equipment. You can get plenty of speed out of a 25" boat with the milder motor. High speeds can be fun but on many hulls not designed for them you will spend more time retrieving an upside down boat than running it.





.
Old 09-30-2010, 04:34 PM
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andybenton
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Default RE: brushless recomendation

lets simplify this all...

what mm can would the typical 540-550 size brushless motor,

next,

if someone could send me in a general direction of what amp rating would be safest on the esc for a 3000kv brushless motor on 3s lipo in a 25 inch fiberglass hull



this boat is being converted from nitro to electric, its a custom hull, not sure who built it originally, and i ripped the hardware and motor out for a nitro hydro im working on. so i decided to give it a shot at electric boats.

i race a losi 1/10th scale buggy at my local track, its got a novak gtb 10.5 brushless system in it, so im not new to electrics, (this is just one amongst several electrics i own.)

also im not new to boats, this boat has been with me all season as nitro, as well as 2 balsa nitro hulls,


Old 09-30-2010, 05:43 PM
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Basstronics
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Default RE: brushless recomendation

With a 3S you want as close to 3000 KV as possible.

The 540 sized should be 36mm OD.
http://hobbyking.com/hobbyking/store...hless_Inrunner

I would go that route. Im dropping that motor into my 25" Delta Force copy right now.

I also powered it with a 380 XL 2898 earlier with good results.
Old 09-30-2010, 06:48 PM
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andybenton
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Default RE: brushless recomendation

i looked at those, what are you running as far as water cooling?
Old 10-02-2010, 04:15 AM
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Default RE: brushless recomendation

Hi Andy,

I've been running the KD motors too and found them to be amphogs, if your hull runs light (pictures please?) this one draws less current and should work too:
http://hobbyking.com/hobbyking/store...600kv_Inrunner

Cooling is done with a jacket such as this:
http://www.offshoreelectrics.com/pro...od=ose-mjacket

Regards, Jan.
Old 10-02-2010, 06:38 AM
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Basstronics
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Default RE: brushless recomendation

Any water jacket.

You have options.

Steve at OSE has a selection and is US Based. You will get your order quickly.

There are also numerous options elsewhere and E bay- often times less price but comes from Hong Kong. HK standard shipping often takes 3-4 weeks. Ive even had 5-6 weeks... If you are in US and order from Steve you will have it in about 3-4 days.

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