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Old Jul 28, 2013, 02:03 PM
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panyator's Avatar
Singapore
Joined Jul 2013
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Poor man carbon fiber foldable mini H-quad

Hi all,
I've been into this hobby for a few month already, but it's only recently that I have started to build my own frames. My first frame was an ugly wodden contraption of an H-quad that my neighbour mistook for a sandal when folded. Nonetheless, it flew great and was rather compact when folded given it's 450 size. But it was still too big to allow me to bring it anywhere anytime with me, so my next project was to shrink it down and tick the following boxes:

-As small and light as possible
-Takes 5 to 6 inches props
-Cheap and easy to build
-Foldable and crash resistant
-Have a dirty and clean stage, like the QAV400/500
-Made of carbon fiber
-Uses 2200mah 3S battery, reason being that I have a fleet of them...

On my journey on the net, I came across this finding:
http://hobbyking.com/hobbyking/store..._HK_550GT.html
The shape is perfect for the main plates of an H-quad, holes are already being drilled on the strategic area, only unknown what the size. Given the size of a 550 heli, i roughly estimated the length to be 20cm, so I took the risk and ordered 4 of these. It turns out that their actual size was 210x60x1.5mm
So they were perfect! And a steal, at less than 5$, they come with a set of screws that are worth the price of the whole thing alone.
The thing is that with so many holes carved out from a 1.5mm CF sheet, the plate itself is not very rigid to torsion and flex, so 2 10mm carbon fiber square tube are used as struts to reinforce the plates. That makes for an ultra rigid main body. The main body is isolated from the 'clean' stage with shock dampening rubber spacers (holes are already predilled for that)
I used 10x12mm bass wood arm instead of CF because it's actually lighter than CF and absorbs vibration better.
The folding mechanism is just made of a M3 wingnut that tighten or loose the arm. When tighten, the friction of the wood on the CF is enough to lock the arms in place, and provide some dampening in case of a crash.

Here's the main ingredient list:

4 x http://hobbyking.com/hobbyking/store..._HK_550GT.html
1 x http://hobbyking.com/hobbyking/store..._GYRO_ACC.html
1 x http://hobbyking.com/hobbyking/store..._Capable_.html
1 x http://hobbyking.com/hobbyking/store..._10x750mm.html
4 x http://hobbyking.com/hobbyking/store...ontroller.html
4 x http://www.myrcmart.com/zmr-1804-240...4tdulcvdlv2vl7
2 x http://hobbyking.com/hobbyking/store...Pair_Bag_.html
1 x http://www.himodel.com/multi_rotors/...rews_4pcs.html (for 1.5$, they were such a steal that I syphoned all the remaining stock, sorry guys)

Plus 10mm and 30mm nylon spacers, and lots of M3 screws of different size.

The result is a great little flyer that can shot jelly-free video with my 808#16 camera. It's very resistant to wind but a bit heavy: 499g AUW with a 2200mAh 3s Zippy battery. Of course this design is very modulable so it's possible to make an acro only version that weight less than 300g AUW by removing the clean stage and leds and using smaller batteries.

Aerial Photography ultimate version with Mobius brushless gimbal


ORIGINAL WOODEN ARM




FULL CARBON ACRO


VTAIL VARIATION


TRICOPTER VARIATION


FPV VERSION WITH GPS


FULL CARBON WITH ZMR ARMS


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Last edited by panyator; Mar 04, 2014 at 09:58 PM.
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Old Jul 29, 2013, 09:18 AM
quadiger
Australia, WA, Perth
Joined Jun 2013
673 Posts
Nice low cost build. Any chance of seeing some video from this quad?
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Old Jul 29, 2013, 12:14 PM
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panyator's Avatar
Singapore
Joined Jul 2013
415 Posts
Videos from Mobius

Flying the quad in Thailand and Indonesia (3 min 23 sec)

Custom Mobius brushless gimbal 2nd flight on mini-H quad (3 min 50 sec)
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Last edited by panyator; Mar 26, 2014 at 03:59 AM.
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Old Jul 30, 2013, 12:23 PM
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panyator's Avatar
Singapore
Joined Jul 2013
415 Posts
I just received my new Mobius Actioncam, strapped it on the mini H-quad and went for a flight after work. I still can't believe the result are so good for such a cheap camera. Definitively a huge improvement over the old 808#16 cam.
http://www.youtube.com/watch?v=B2hd_0kKEkY
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Last edited by panyator; Aug 14, 2013 at 05:39 AM.
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Old Aug 11, 2013, 06:01 PM
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Joined Jun 2013
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this is a very nice build, sir! I consider to rebuild it myself!
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Old Aug 12, 2013, 11:21 AM
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Joined Jul 2011
159 Posts
Very good stuff!
I have a wooden H quad with mt1306 motors and these plates can be a nice upgrade. The motors you linked are also a nice alternative to the expensive T-Motors.
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Old Aug 13, 2013, 05:44 AM
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panyator's Avatar
Singapore
Joined Jul 2013
415 Posts
Those ZMR 1804 2400KV motors are really nice motors considering the price. Sure it looks like monkeys did the windings, but they are still packing a lot of punch, especially on 3S. My full FPV setup is 580g AUW with a 2200mah 3S lip, and it's hovering a bit above 50% wit 5045 triblades.
A word of warning, the provided screws are a bit long so it's possible to damage the winding by srewing them a bit too far. So use shorter screws or dremel them down a couple of mm.
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Old Aug 13, 2013, 05:04 PM
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Joined Jul 2011
159 Posts
Thanks for the warning.
I have already ordered 2x3 ZMR 1804 motors - it's a nice touch that they have CW and CCW versions. This way you can be sure you wont lose a prop. I was planing a mini hexa with Multistar 1704-s, but these ZMR-s can be a better choice.
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Old Aug 13, 2013, 11:51 PM
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Singapore, Singapore
Joined Apr 2012
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Quote:
Originally Posted by panyator View Post
Not much time to edit videos, but here is an onboard video of a crash into a tree. No damage at all, and it was happily flying again a few minutes later

http://www.youtube.com/watch?v=_bEz-BOKP80
Interesting build. Neat. Nice place to fly bro If you live near Changi/Pasir Ris I'd like to see you flying that quad. I'll bring along one of my crafts too
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Old Aug 14, 2013, 12:15 AM
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Australia, NSW, Sydney
Joined May 2013
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great!
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Old Aug 14, 2013, 05:38 AM
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Singapore
Joined Jul 2013
415 Posts
Quote:
Originally Posted by cruiser73 View Post
Interesting build. Neat. Nice place to fly bro If you live near Changi/Pasir Ris I'd like to see you flying that quad. I'll bring along one of my crafts too
I am living in Simei, not too far from Pasir Ris but I've been to Pasir Ris to fly only a couple of time... Hard to match family life with this hobby
Maybe we could try to catch each other some day!

Here's another boring Mobius video of my place in Thailand, showcasing the stability of this frame. There's no jello at all, everything is super smooth.
This quad is now my favorite one, amongst the dozen I have at home
Mobius actioncam on mini H-quad in Chiang Mai (6 min 33 sec)
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Old Aug 14, 2013, 07:38 AM
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Singapore, Singapore
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Quote:
Originally Posted by panyator View Post
I am living in Simei, not too far from Pasir Ris but I've been to Pasir Ris to fly only a couple of time... Hard to match family life with this hobby
Maybe we could try to catch each other some day!

Here's another boring Mobius video of my place in Thailand, showcasing the stability of this frame. There's no jello at all, everything is super smooth.
This quad is now my favorite one, amongst the dozen I have at home
http://www.youtube.com/watch?v=RGgnEDDBMgw
We should.
Another nice vid bro. See you soon.
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Old Aug 14, 2013, 09:33 AM
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United States, UT, South Jordan
Joined Jul 2013
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H Quad

Nice job!, I noticed that you have a ZMR in the pictures, did you try the arms to see if they will work on the mini h ???
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Old Aug 14, 2013, 11:41 AM
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Quote:
Originally Posted by 4bladeflyingfish View Post
Nice job!, I noticed that you have a ZMR in the pictures, did you try the arms to see if they will work on the mini h ???
I think it'll work but they are far from ideal for the h-quad. They are very thin and will twist and bend...
I also have made arms out of 10mm square CF tube, but I still prefer the flying characteristics with the wooden arms.
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Old Aug 23, 2013, 03:35 PM
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USA, IL, Chicago
Joined Jul 2008
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Great idea! Based on your design I am going to try to make an fpv version of this. Do you think your battery will fit under the frame and keep the 'gear' on the ground? 2200 3s.. hmm should fit.
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