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Author Topic: Converting 27MHz Co-axial to 2.4GHz  (Read 2726 times)

keukpa

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Converting 27MHz Co-axial to 2.4GHz
« on: December 16, 2012, 06:30:13 AM »

OK,

So my sister was kind enough to buy me a LARGE co-axial Helicopter for Christmas (Sky King 42"), so pretty hefty.

The current control system is a custom 27MHz board that drives two DC motors, one for each set of the coaxial blades.

What I want to do is convert this system to 2.4 GHz and make it FPV. I want 2.4GHz as I'll get some better range and more channels.

I've found one solution that I think might work, but this will only give me limited channels, I'll show that in a second. But the problem I'm forseeing is that the throttle channel on the coaxial controls both the motors at the same time, and yawing left or right, changes the speed of one of these motors to allow the rotation....

So I can just put in a standard 2.4GHz RX and Some ESCs as this isn't going to work, so my question is, does anyone know how this modification can be made? Are there any off-the-shelf 2.4GHz mods for coaxial helicopters?

Here is the helicopter:



http://www.ebay.co.uk/itm/160882758182?ru=http%3A%2F%2Fwww.ebay.co.uk%2Fsch%2Fi.html%3F_sacat%3D0%26_from%3DR40%26_nkw%3D160882758182%26_rdc%3D1

Here is the heli control board:



http://www.ebay.co.uk/itm/SKY-KING-8501-01-PCB-Receiving-Board-Motherboard-27MHz-/120697579760?pt=UK_ToysGames_RadioControlled_JN&hash=item1c1a22e8f0&_uhb=1

Here is what I'm thinking of using to make 2.4GHz, however, I'm not sure if this will have the current supply for this size heli:



http://www.ebay.co.uk/itm/ESKY-2-4GHZ-4-IN-1-RECEIVER-LAMA-V3-V4-HUNTER-KOB-CO-AXIAL-000878-RX-EK2-0708-/150663340144?pt=UK_ToysGames_RadioControlled_JN&hash=item23143c2070&_uhb=1

Any help would be much appreciated!

Keukpa

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electrotor

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #1 on: December 16, 2012, 12:39:11 PM »

The 27MHz board appears to be both rx and  controllers, but the Esky appears to be just the rx so is not a direct replacement. You would have to find a matching controller board for the motors. How much time do you have and experience with electronics?
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keukpa

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #2 on: December 16, 2012, 12:45:19 PM »

Hi electrotor,

The 4-in-1 also powers to motors (I have on of these on my small V3-Lama) - better view and info here:

http://www.heliguy.com/Electric-RC-Helicopters/ESKY-KOB/EK2-0708-2.4GHz-4-in-1-Controller/

As for electronics experience, a degree in Electronic Engineering, and about 20 years experience (playing :) ). Oh and loads of time.

I was mainly wondering if there was a COTS I could use for direct replacement, if not I'm sure I can stick something together. Just prefer the easy option :)

Cheers,

Keukpa
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mike

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #3 on: December 16, 2012, 12:56:14 PM »

i might be wrong but... i think the kk board can controll a coax too   (2M 2S singlerotor??)
+2 cheap escs and it should work :P

keukpa

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #4 on: December 16, 2012, 01:03:25 PM »

Hi Mike,

Hmmm now there is an idea!! Any links to reference this?

I'll have to read up!

Cheers,

Keukpa
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Coyote

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #5 on: December 16, 2012, 01:10:06 PM »

i might be wrong but... i think the kk board can control a coax too   (2M 2S singlerotor??)
+2 cheap escs and it should work :P

That`s a very good point, the KK the black and blue boards can run dualcopter mode which is a coaxial heli. That`s by far the easiest way
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keukpa

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #6 on: December 16, 2012, 01:21:37 PM »

Awesome!

Are these the HobbyKing ones?......hang on let me find a link....

These:

http://www.hobbyking.com/hobbyking/store/__21977__HobbyKing_Multi_Rotor_Control_Board_V3_0_Atmega328_PA_.html

Actually, thinking about it, would any KK board, or even MultiWii board do it?

Cheers,

Keukpa
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Coyote

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #7 on: December 16, 2012, 01:59:49 PM »

The multiwii does support dualcopter yes

I`m not sure on that board you linked too, but this board does for sure

http://www.ebay.co.uk/itm/KK-Multicopter-Flight-Control-Board-V5-5-Tricopter-Quadcopter-Hexacopter-/230882665173?pt=UK_ToysGames_RadioControlled_JN&hash=item35c1ade2d5
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pk-surfing

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #8 on: December 16, 2012, 02:26:36 PM »

The OpenPilot CC board (and CC3D) looks like it will do coaxial

http://forums.openpilot.org/topic/10645-coaxial-helicopter/page__hl__%20coaxial

PK
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electrotor

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #9 on: December 16, 2012, 02:43:15 PM »

Time available and experience give you a distinct advantage. The Esky link in your first post only partially came up on my phone so it appeared to be only an rx. As I recall the Lama is quite a bit smaller than the coax you have been given so it is likely that the current raings of the escs will not be sufficient.
KK solution seems promising but more complex than necessary.
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keukpa

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #10 on: December 16, 2012, 02:50:22 PM »

yeah, this was my thought, I think it isn't sufficient to deliver the required current for the larger heli.

But I think a KK or MultiWii that do co-axial is certainly the quickest and easiest solution, and pretty cheap too :)

So, I'll investigate that first...unless anyone knows of a dedicated system?

Cheers,

Keukpa
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charosenz

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #11 on: June 05, 2013, 07:37:18 AM »

I am sure if the authors will read this but I would sure like to know if the conversion worked out.   If so could you share the results here on the thread?
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DaveyLC

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #12 on: June 07, 2013, 04:49:06 PM »

By the looks of things you need three brushed speed controllers (2 medium, 1 weeny), a gyro and some interesting mixing on your radio :D
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charosenz

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #13 on: June 08, 2013, 04:42:11 PM »

DaveyLC

I thought about the mixing issue, and not sure how that would be set up.  I am sure someone has done this...... 

 I also like the idea of using a multirotor mixing board like the KK style controller.  I know that Hobby King advertises one for about $20.00.  It has a 3 axis piezo gyro on the board which is great.  I know it has a 3 rotor profile on the list of set up.   I am just not sure if you used this board, if it would take the place of the 3 brushed, ESC, do you?

I was also hoping to hear back from some of the folks who posted on this to see if they made any progress on this. 
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DaveyLC

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Re: Converting 27MHz Co-axial to 2.4GHz
« Reply #14 on: June 14, 2013, 06:43:03 PM »

The gyro will need to control the speed difference between the two main blades but you'd have to create a mix for the throttle as it will be controlling two speed controllers.
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