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E Motor sizes

#1
Hi guys

Been building my own foamies for a little longer than a year now, but I lack the understanding around motor sizes.

As an example, a 2218 Brushless Outrunner, what does the 2218 mean?

Would be great if someone can piont me in the right direction.

Thanks for sharing the info ;)
 

pgerts

Old age member
Mentor
#3
Hi guys
Been building my own foamies for a little longer than a year now, but I lack the understanding around motor sizes.
As an example, a 2218 Brushless Outrunner, what does the 2218 mean?
Would be great if someone can piont me in the right direction.
Thanks for sharing the info ;)
You are not the only one being confused at the numbers.
Look at the 2218 http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11172 and get even more confused.
or this 28 22 http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5354
But this one seems to fit the description http://www.hobbyking.com/hobbyking/store/__12921__D2830_11_1000kv_Brushless_Motor.html

Try to go for the weight or watt when you select the motor.
 
#4
You are not the only one being confused at the numbers.
Look at the 2218 http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11172 and get even more confused.
or this 28 22 http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5354
But this one seems to fit the description http://www.hobbyking.com/hobbyking/store/__12921__D2830_11_1000kv_Brushless_Motor.html

Try to go for the weight or watt when you select the motor.
Thanks, that's what I have been doing (thurst in grams or WATT) and I seem to have found this to be the best way to choose.

It is just when you look at some of the FliteTest episodes they always refer to a certain size, 450 Park Flyer, but for a newbie like me that does not make alot of sense.

But now at least I know the 2218 is for diameter and height :)

Thanks for the help guys.
 

pgerts

Old age member
Mentor
#6
It is just when you look at some of the FliteTest episodes they always refer to a certain size, 450 Park Flyer, but for a newbie like me that does not make alot of sense.
There are a lot of size numbers to compare.
One way is the equivalent to IC engines, like 25e comparing to a 0,25 ci (4cc) glow - same for 10, 15, 40, 60, 90 and 120 size.
Another way is the mentioned 450 park referring to the old electric brushed dc-motors where 450 is for the lengt of the motor. 250 is for 25 mm 400 is for 40 mm 450 is for 45 mm 600 for 60 mm. I am not familiar with motors smaller than 250 and bigger than 750 in those old heavy things.
The system 28-08 could be for the diameter and length of the magnet pack - total diameter and length of the actual motor was normally more but that system does not seem to be adapted as shown in my links above.
 
#7
Is there any way to decipher the Hobby King motor sizes in comparison with other brushless motor sizing. Examples: 300, 400, 450, 480, .15, .20, .25, .40, .46, .60. The pricing on the brushless motors sold by Hobby King are great but unsure what is the size of the motors are in power terms.