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[U-33]

Gentlemen...spot of advice if you please.


What would be the equivalent brushless motor to replace a 380 brushed motor? I'm looking for something nice and small, but with a bit of 'oomph' in it, preferably to be able to be run from a 7.4v lipo battery.


Your suggestions, please...thank you kindly.


Rich


(oh, and available from a UK stockist)

[essex2visuvesi]

http://www.hobbyking.co.uk/hobbyking/store/__692__691__Cars_Parts-Micro_to_1_18th_Scale_380_Type_.html


These should work :)

[U-33]

Which one, E2V...there's a page full of the things?

Rich

[Calimero]

What power and speed do you need ?


A "380" or "540" motor tells us approximate physical size (and mounting points) but that's about it.

[U-33]

At present I have a 380 motor in my Long Tail boat...it's proving to be too big and too heavy, so I need a motor smaller/lighter than the 380, but with similar power.


Rich

[Calimero]

OK. What kind of RPM do you need ? What prop size ?

[U-33]

Similar rpm to the 380, prop size is 35mm three blade plastic.


Rich

[Netleyned]

If your 380 is a 6v 18000 rev
you will need something around 2500K/V
with a 7.4 Lipo


Ned

[U-33]

Hmm...mine is a 7.2v-12v 380 motor.


Rich

[Subculture]

I'd go for something around 2000kv mark with 2s lipo on a 35mm prop. Should provide ample performance.

This is a diddy little motor, but don't be fooled by the modest dimensions, they're powerful little blighters.

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=28419

[U-33]

Excellent..thanks Andy, just what I needed.


Rich

[Netleyned]

A 7.2v 380 revs at 26000 so you may need a slightly higher K/V than 2000

Ned

[Subculture]

Not sure what 380's you have. The ones I have used e.g. Graupner 400 7.2v, Tamiya 380's etc. tend to rev at about 16000RPM, nowhere near 26000RPM.

Some of the really hot 380 sized motors like the BB race could do those sort of revs.

Depending on prop slip, the motor specced should give anywhere from about 8-14mph speed. If the pace is too much, fit a smaller prop.

[U-33]

I don't think my 380 revs anywhere near 26000 revs, if it did, I'd have a top fuel drag racing long tail boat!


I just need enough speed to push the boat along at a sensible rate of knots, with a bit in reserve if it's needed. If it's too quick I can always back the throttle stick off a bit. I'm not sure about having a reverse function, I don't think these boats would go astern too well, it'd probably end up getting swamped.


Rich

[Subculture]

Just a simple forwards only esc required then e.g. http://hobbyking.com/hobbyking/store/__21247__HobbyKing_10A_ESC_1A_UBEC.html

I doubt your 380 is doing anything close to 26k either- else you'd have a burned up motor, controller or both.

[U-33]

I've got an esc already, bought one ages back for something...can't remember what now. It's an aircraft one, handles about 25 amps, I think...but the main thing is it's size. It's tiny, which is just what I need.


Rich

[vnkiwi]

I'd go for something around 2000kv mark with 2s lipo on a 35mm prop. Should provide ample performance.

This is a diddy little motor, but don't be fooled by the modest dimensions, they're powerful little blighters.

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=28419

Rich, I'd go for this as well, and no reverse, that was the main point of mounting them on a 360 degree pivot.
That wee 10g with the hull etc you have, and a bit more lead under hull, should be cool
 

[U-33]

Thanks, VNK...not sure how to get full 360 degree rotation as yet, but it must be possible.


Rich

[vnkiwi]

Hi Rich,
on your wee boat, I wouldnt bother with 360degree rotation.
Can be done, but to heavy and complex for such a small craft.
Just the steering you have will be fine, but keep the rotation very gentle, and not to much angle.
On yours, if your worried and require reverse, then do it with the ESC if possible. As I said, I wouldn't bother.
Keep up the good work
cheers
 

[Netleyned]

Rich,
Sorry if my info on 380 specs was a bit misleading
I got it from this.http://homepage.ntlworld.com/edward.matthews/ddmbc_files/motors/mabuchi.htm
 
Ned

[U-33]

No problem, young fella me lad...motor is sourced, job's a good'un.


Rich

[Subculture]

All the mabuchi can motors come in numerous winds, so it's difficult to differentiate between them.

[david5]

Hi,I've ordered one of the motors recomended by subculture as I think it will do a project I'm doing quite well,but what ESC do I get ?,I'm not familiar with brushless motors yet,if possible I would like reverse but not essential.
David5

[kinmel]

Any one from this range,  choose your preferred amperage of those available from the UK warehouse and order when it is in stock there, or else reserve one for when it is back in stock.

http://www.hobbyking.com/hobbyking/store/__67040__HobbyKing_50A_Boat_ESC_4A_UBEC.html

[david5]

Hello
Peak EFF current is 5.5A,so would the 12 amp ESC be ok ?
David5