# What makes a powerful brushless motor?
**URL:** https://foil.zone/t/what-makes-a-powerful-brushless-motor/18743
**Category:** Propulsion System (Motor, Gears)
**Created:** [July 29, 2023, 5:49pm UTC](https://foil.zone/t/what-makes-a-powerful-brushless-motor/18743 "2023-07-29T17:49:13Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [July 29, 2023, 5:49pm UTC](https://foil.zone/t/what-makes-a-powerful-brushless-motor/18743/1 "2023-07-29T17:49:13Z")
I came accros this video from [SunnSkyRC.com](http://SunnSkyRC.com) : weight: 26 grams, static thrust in air : 680grams so a X26 multiplying factor
[ ](https://www.youtube.com/watch?v=HHLj5oYOKAU)
Then discovered:
Manufacturer site: [http://en.rcsunnysky.com/x-fixedwingseries/1148.html](http://en.rcsunnysky.com/x-fixedwingseries/1148.html)
US site: [SunnySky X Series V3 X7025 V3 40CC Equivalent Motors – SunnySky USA](https://sunnyskyusa.com/collections/x-v3-motors/products/sunnysky-x7025-40cc-motors),
Max power in air : 5800W, 135 A max for 30 sec, 38V
US price: 250usd
So it’s a 70mm x 25 coil (67 mm total length), 190kv, 800grams, 24N22P, equivalent power of a 40cc motor.
The build quality reminds me of LIFT/FR, here a 4130 VX3
If we had the same build quality in our 63x84 motors, could we increase their power significantly ?
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### Author:  [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [August 2, 2023, 12:44pm UTC](https://foil.zone/t/what-makes-a-powerful-brushless-motor/18743/2 "2023-08-02T12:44:24Z")
Can’t judge a motor from pictures or specs on the internet really. Larger motors from a european and large manufacturer, yes - but not chinese.
What can be done to the 6384s:
-Laminations are already thin and in our rpms they won’t matter too much.
-You could get higher torque capability with high saturation steel laminations like the cobolt alloy ones.
-To match this the coils need to be able to produce those fields (=higher current) for longer time without overheating so windings need a better copper fill factor, could be achieved with hand winding or even hairpin windings, that would be novel on a motor this size😄
-switch to stronger, n52 magnets for efoil use (but not for land use as n52s are too temp sensitive, any heat rise and they are less powerful than a normal magnet.)
I bet you could get 1.5-2x the short term output of the motor. Continuous not so much since thermal properties will be limiting and this is hard to solve in a motor this small.
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### Author:  [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [August 2, 2023, 4:08pm UTC](https://foil.zone/t/what-makes-a-powerful-brushless-motor/18743/3 "2023-08-02T16:08:54Z")
> [@Larsb](#):
>
> hand winding or even hairpin windings, that would be novel
Had a look and yes, that would mean torque+ range increase, improved performance despite power and weight decrease…
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### Author:  [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [August 2, 2023, 5:14pm UTC](https://foil.zone/t/what-makes-a-powerful-brushless-motor/18743/4 "2023-08-02T17:14:38Z")
That’s not really a fair comparison but yeah, they make filling the slots easier.