Brushless/Brushed number of turns
11-05-2008, 10:31 PM
#1
Brushless/Brushed number of turns
Is the number of turns on a Brushless motor equivalent to a brushed motor with the same number of turns?
eg Is a 10.5T brushless motor the same as a 10.5T brushed one?
eg Is a 10.5T brushless motor the same as a 10.5T brushed one?
11-05-2008, 10:59 PM
#2
in terms of whats been approved for sanctioned racing..
27T brushed -- 17.5T brushless
19T brushed -- 10.5T brushless (or 13.5T brushless)
In general, the equivalent power levels are not the same when comparing the same number of winds on a brushed or brushless motor.
27T brushed -- 17.5T brushless
19T brushed -- 10.5T brushless (or 13.5T brushless)
In general, the equivalent power levels are not the same when comparing the same number of winds on a brushed or brushless motor.
11-05-2008, 11:53 PM
#3
You've lost me now 
, how can a Brushless 10.5T or 13.5T equal a 19T brushed?....btw I'm not doubting you, just trying to make sense of it 
I purchased a S400 and was told he'd give me a 10.5T brushed motor....so what would that equate to?
When people refer to what a class will run on, is Brushed/Brushless also specified...or are one of these the normal default so people know what they mean?
, how can a Brushless 10.5T or 13.5T equal a 19T brushed?....btw I'm not doubting you, just trying to make sense of it I purchased a S400 and was told he'd give me a 10.5T brushed motor....so what would that equate to?
When people refer to what a class will run on, is Brushed/Brushless also specified...or are one of these the normal default so people know what they mean?
11-05-2008, 11:59 PM
#4
The equivalencies are just rough guesses that were made by race organisers. As brushless motors develop, these guesses are being changed.
10.5 was the first guess at a 19T brushed equivalent, however it turns out that 10.5 is quite a lot faster, and that 13.5 (first made as a 27T equivalent) is closer.
If a wind in the rules is xx.5 then it will be brushless, round numbers are brushed.
10.5 was the first guess at a 19T brushed equivalent, however it turns out that 10.5 is quite a lot faster, and that 13.5 (first made as a 27T equivalent) is closer.
If a wind in the rules is xx.5 then it will be brushless, round numbers are brushed.
11-06-2008, 12:39 AM
#5
The 10.5T brushed motor is fast enough to run modified touring, although most would be opting for 5.5-3.5T brushless for this class.
The cutoff for Super Stock is 19T brushed.
Stock level racing is 27T brushed.
Hopefully you're aware that the lower the wind, the "faster" the motor is? Because basically with the 10.5T brushed, you've got a rocket coming your way and you're going to want to make sure you have some spare parts :P
-Mark
The cutoff for Super Stock is 19T brushed.
Stock level racing is 27T brushed.
Hopefully you're aware that the lower the wind, the "faster" the motor is? Because basically with the 10.5T brushed, you've got a rocket coming your way and you're going to want to make sure you have some spare parts :P
-Mark
11-06-2008, 04:32 AM
#7
I read a note from someone who said "take brushed turns and halve them to get a similar performance brushless motor turn number".
So, that seems to work.
27T brushed -> 13.5 brushless
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless
something like that. Brushless motors are not all the same - so the formula isn't exact - but works for a ballpark. Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".
So, that seems to work.
27T brushed -> 13.5 brushless
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless
something like that. Brushless motors are not all the same - so the formula isn't exact - but works for a ballpark. Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".
11-06-2008, 08:10 PM
#8
27T brushed -> 13.5 brushless
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless
Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless
Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".
11-07-2008, 12:24 AM
#9
11-07-2008, 01:05 AM
#10
Tech Addict
I read a note from someone who said "take brushed turns and halve them to get a similar performance brushless motor turn number".
So, that seems to work.
27T brushed -> 13.5 brushless
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless
something like that. Brushless motors are not all the same - so the formula isn't exact - but works for a ballpark. Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".
So, that seems to work.
27T brushed -> 13.5 brushless
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless
something like that. Brushless motors are not all the same - so the formula isn't exact - but works for a ballpark. Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".
That's a good "rule of thumb" but in reality, your list could be offset by one
27T brushed -> 17.5 brushless
19T brushed -> 13.5 brushless
13T brushed -> 10.5 brushless
10T brushed -> 6.5 brushless
7T brushed -> 3.5 brushless
going from 27t brushed to 13.5 brushless was a huge leap in gearing for me at my local track. I went from 8.2 down to 5.1
11-07-2008, 08:49 AM
#11
Tech Master
I heard it was like brushless X2 -2. So a 13.5 would be more to a 25T motor speed. It just seems much faster because you can gear the hell out of them. Try run a 13.5 vs a 19 turn with the same gearing. 19T will be faster.
11-07-2008, 09:13 AM
#12
Obviously you wouldn't run the same gearing because brushless has a much different torque curve and rpm. Brushless has less rpm and more torque for the same power output. Therefore the gearing must be longer.
But if both 13.5 and 19T are geared properly, they should both run competitive and that's what matters...
But if both 13.5 and 19T are geared properly, they should both run competitive and that's what matters...
11-07-2008, 09:24 AM
#13
Tech Master
I guess you can compare them as BL= V8, Brushed = 4cyl turbo engine. 
11-07-2008, 08:52 PM
#14
correct me if i am wrong. i always thought it was the rpm of the motor that determinds the brushed/brushless equivalency. 25000rpm motor on brushed= 27t or 17.5 brushless.
Last edited by mr fit; 11-07-2008 at 09:20 PM.
11-20-2008, 07:02 AM
#15
hi all....
i'm new to this brushless thingy...
brand such as Mamba,HSP,HL is using KV as rating for their brushless motor
how to compare wit other brand?
they rate thier brushless motor using 3000KV,5000KV,7000KV
as the rating .. what is the equivelent ?
3000KV = ?T ( other Brushless Motor ) = ?T ( Brush Motor )
5000KV = ?
7000KV = ?
can someone enlighten me?
i'm new to this brushless thingy...
brand such as Mamba,HSP,HL is using KV as rating for their brushless motor
how to compare wit other brand?
they rate thier brushless motor using 3000KV,5000KV,7000KV
as the rating .. what is the equivelent ?
3000KV = ?T ( other Brushless Motor ) = ?T ( Brush Motor )
5000KV = ?
7000KV = ?
can someone enlighten me?