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>> Home > Forum > Electrical Related > Brushless in or out
Brushless in or out
(430 views)
Author Message
none
(Fleet Admiral!)





Forum Posts: 185
18th May 2017 08:05  
>> Permalink
mdlbt.com/29028

Brushless motors.

Just a question about them.. What is the real difference between an inrunner and an outrunner ?

RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
18th May 2017 08:30  
>> Permalink
mdlbt.com/29032

Hi Sonar,
Check this out

file:///M:/Downloads%20-DELL&PBELL1/0%20Model%20stuff/E%20Motors%20&%20Controllers/Brushless%20DC%20electric%20motor%20-%20Wikipedia,%20the%20free%20encyclopedia.htm#Variations_in_construction

some good info for us 'Brushless beginners!'. I asked me the same question a few weeks ago and, amongst others, found the above.
Cheers Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1399
18th May 2017 09:24  
>> Permalink
mdlbt.com/29039

Hi Sonar
Inrunner brushless have an outer case which remains static just like a brushed motor.
Outrunner brushless have an outer case that revolves around the central core which remains static.
The revolving outrunner case forms a flywheel which is beneficial when driving a model boat prop where the water resistance is greater than a plane propeller in air.
The effect lessens with larger motors used say for fast speed boats.

Doug
That link appears to be to a file somewhere but there is no url.

Dave


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1086
18th May 2017 09:50  
>> Permalink
mdlbt.com/29040

Ooops! Yep I had saved the page!
Here's the link.
https://en.wikipedia.org/wiki/Brushless_DC_electric_motor

For big 'eavy boats an advantage of outrunners is the high tork at low revs 😉 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
John
(Fleet Admiral!)





Forum Posts: 104
18th May 2017 23:46  
>> Permalink
mdlbt.com/29078

Hi Sonar,
I prefer to use outrunners whenever possible as they do not require additional cooling. The down side is you need to have space around the motor.
John.


Happy sailing.

John.
canabus
(Admiral)





Forum Posts: 65
19th May 2017 09:09  
>> Permalink
mdlbt.com/29087

Hi Sonar
I have used both in boats and with no watercooling.
No problems with both types.
The in runners are good for replacing brush motors as the 35mm brushless motor are the same bolt holes as the 540 brush motors.
My first brushless was a Trackstar 17T 2400kv into an old rc car,
90watts to 550 watts, turn it into an insane rocket.
The main brushless motors we use in the boating club are Hobbyking 3639 750 and 1100kv, 3648 1450kv and the outrunner D3548 1100kv with a 2 blade 40-50mm props.
ESC's are the car 60 and 100 amp which handle 2S to 4S Lipo batteries.