View Full Version : First brushless motor kit

04-29-2008, 09:32 PM
I am considering purchasing a brushless outrunner motor kit, but don't really know what package to buy. Would like to build a moderate priced, double stator motor (not CD-RM style) of sufficient power to handle a 16 - 20 oz plane for sport flying with some light 3D for practice. Need suggestions on kit, wire, number of winds, etc. Please feel free to comment. I've never done this before so I know I'll need all the help I can get.????

Still looking for suggestions on above

04-30-2008, 01:51 AM
I cannot give you any advice on that, but ... here's some generic advice in case you have not seen it yet.

Excellent motorbuilding articles by Brian Mulder,they cover the all the basics, a must read:
-> Articles by SouthEasterners.
-> Electric Motors - part 1-5

Do-it-yourself motor homepages, manuals/tutorials, checks and tests in this motor builders tips and tricks thread. The checks and tests may save you from frying your controller or motor. Thread is active, bookmark it for future reference and subscribe to it:
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky thread, at top of that subforum)

The ‘bible’

Two instructive motor winding/assembly videos, 14 & 10Mbyte respectively (cd-rom and lrk have different winding diagrams!)
http://www.youtube.com/watch?v=iHYlWKICkqc&e http://www.youtube.com/watch?v=Ybb0Ysh0FRE
Vriendelijke groeten ;) Ron van Sommeren
• int. electric fly-in (http://home.hetnet.nl/%7Eronvans/), Nijmegen, the Netherlands
• brushless motor building tips & tricks (http://www.rcgroups.com/forums/showthread.php?t=240993)
• diy brushless motor (http://www.yahoogroups.com/group/lrk-torquemax) discussion group
• Drive Calculator (http://www.yahoogroups.com/group/D-calc/) download & discussion group

04-30-2008, 10:11 PM
I just rewound my first motor yesterday! Put it on a speed controller and fired it up...she worked!
I had a loose shaft when I maidened my rhythm bipe and ended up frying the motor due to some insulation contact...but I rewound it using three strands of 30 ga. and the motor spun up when I was done! I need to put it through the numbers, but it worked! I can't wait to try it again!

04-30-2008, 10:15 PM
Is it cheaper to buy a kit than a ready to go BL outrunner?
Also what happens if you use thin wire or if you use thick wire?

04-30-2008, 11:05 PM
Not sure about cheaper. I think it depends on the kit. I happened to have a fried motor sitting around and decided to rewind it. I went down to radio shack and they had three different gauges of wire on spools for five bucks.

It's probably cheaper to buy a UH motor/combo I would think.

As for what happens with different gauges of wire, you'll have to read up on it.


There is some great info on that site, I referenced it during my rewind yesterday.

04-30-2008, 11:08 PM
Nice, i may have to give it a go.

04-30-2008, 11:57 PM
... Also what happens if you use thin wire or if you use thick wire?First you figure out the number of winds for the Kv you need. Use the thickest wire possible for that number of winds, better for efficiency, lower temperature.

05-01-2008, 05:54 PM
Well, looks like I'll be winding another one today! I kinda oopsied. Burned up my TP yesterday, and now I have a plane repair and a motor winding to do!

Any suggestions on the towerpro motors? It's the 2408 21T. What gauge and how many turns?