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Old Apr 01, 2014, 09:59 PM
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DIY Coaxial motors

Hello guys!!

I don't know how many guys are experimenting with making their own coaxial motors, but I am so I figured I'd share.

Please discuss any homemade coaxial motors here.

I know about Kimmo's thread, but would like to start a new one about systems made for individual use.(for now)

Enjoy!

Free
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Last edited by Free; May 03, 2014 at 04:19 PM.
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Old Apr 01, 2014, 10:03 PM
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With about $20 for the hardware, with $75 for the Glavak props, and with about 5 hours of work, I have successfully made a coaxial system!

It was relatively easy and I am very happy with it.
It is the first version and I did not try to save to much weight, but it is still 18 grams with Vprops, and 16 grams with Glavak straight props!

It produces about 130 grams of thrust and will be suitable for a 75-85 gram aircraft.

I am thinking about trying to make my own props in the future. We'll see.

Enjoy!

Free
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Old Apr 02, 2014, 06:00 AM
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Hi Free
That looks really impressive keep up the good work, I've got the frame, gears and shafts etc from a tiny coaxial heli to play with so I'll see how I get on .
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Old Apr 02, 2014, 11:35 AM
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Thank you!! I must give credit to "Bicutz" here on RCG for giving me the idea and telling me where to get the gears!

The only downside is the fact that it is loud.(due to the gears) And the prop savers were tricky to make.(they took the most time)
But I can get over that.

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Old Apr 02, 2014, 11:39 AM
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Can you share what you did? What parts?
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Old Apr 02, 2014, 12:05 PM
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Sure! I'll try to take some photos, but until then, here's the parts listing:
HK Motor
3mm ID bearing from a different HK motor
The orange thing is the hub from a GWS 8x4.3 prop, modified to hold the bearing.
3mm OD aluminum shaft from Tower Hobbies.
2mm carbon rod(could save weight by using tube)
A tiny piece of 3mm OD 2mm ID carbon to keep the 2mm shaft from falling out the back.
Two servo arms and some small plastic rings for prop savers.(modified, of course)
1/16" plywood for motor mount.
Gears(they took forever to ship)
CA
A tiny piece of Depron foam used for supporting the motor.

Those are all the parts.

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Last edited by Free; Apr 04, 2014 at 10:50 AM. Reason: Added 3mm OD 2mm ID carbon shaft
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Old Apr 02, 2014, 12:07 PM
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Quote:
Originally Posted by Arcright View Post
Hi Free
That looks really impressive keep up the good work, I've got the frame, gears and shafts etc from a tiny coaxial heli to play with so I'll see how I get on .
I thought about doing that, but I don't have a small coaxial heli, and I didn't want to buy one.

Post pics!!

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Old Apr 02, 2014, 12:28 PM
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Glad you started this thread and great job on your first try. Would be nice if we could get Bicutz to share here.
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Old Apr 02, 2014, 12:39 PM
Atleast It's in one piece
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Hi Free
Only got the heli guts this week looks like I need to cut the outer shaft down to give space between the gears for the motor drive to fit in and then a spring between the shafts to keep a bit of pressure on.
I was hoping a rubber bush would serve a drive between the gears just need some time to play.
Forgot to mention the doner heli was the remains of MCX blade one of my fellow indoor flyers gave it up for free he said he may others but I reckon I'll have to give him a beer or two if I want them.


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Last edited by Arcright; Apr 02, 2014 at 05:50 PM.
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Old Apr 02, 2014, 03:06 PM
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Looks good!!

I look forward to seeing progress!

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Old Apr 02, 2014, 11:12 PM
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A coaxial helicopter uses 2 motors on all the rc ones at least. Just throwing that out there
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Old Apr 03, 2014, 02:43 AM
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I have a tote full of parts to build one, I have just been too busy. I have built three big planes two electric and one gasser with a DA50. I have to get this stuff finished because I really miss flying my foamies.

Great work Free, lets see it run buddy.
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Old Apr 03, 2014, 05:13 AM
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Quote:
Originally Posted by Bubba Gump View Post
A coaxial helicopter uses 2 motors on all the rc ones at least. Just throwing that out there
Hi Bubba
The motors from the old heli won't be used I've attached a quick drawing to try to show the idea.
The drive from brushless is through a rubber bush so the teeth one gears aren't used.


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Old Apr 03, 2014, 01:50 PM
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Quote:
Originally Posted by akfreak View Post
I have a tote full of parts to build one, I have just been too busy. I have built three big planes two electric and one gasser with a DA50. I have to get this stuff finished because I really miss flying my foamies.

Great work Free, lets see it run buddy.
I have a video, I just have to upload it. It's just of it running up to about 20%. I'll try to get it up here soon.
Quote:
Originally Posted by Arcright View Post
Hi Bubba
The motors from the old heli won't be used I've attached a quick drawing to try to show the idea.
The drive from brushless is through a rubber bush so the teeth one gears aren't used.
Arcright
A very simple design. Where are you guys getting the spring for the 2mm inside shaft?

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Old Apr 03, 2014, 04:32 PM
Atleast It's in one piece
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A very simple design. Where are you guys getting the spring for the 2mm inside shaft?

Free[/QUOTE]

I'm still looking hoping to find some common household item to get it from.

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