Monday, June 16, 2014

Donkey Quad


Update:  Have one?  Building one?   Click Here: Donkey Quad Manual

A while ago I bought an inexpensive HobbyKing F330 frame, thinking I would use it with some SunnySky X2212-9 1400KV motors and 8" props I had.  Unfortunately, that turned out to be a very unstable combination.  It was fast as hell, and good at aerobatics, but I couldn't tune the shakes out of it.  I decided those motors were just too big for that small 330mm frame.

On a whim, I was looking at the cheapest 3S capable outrunners that HobbyKing sells when I ran across these ugly duckings here:

The Donkey ST2004-1550kv, "When pulling power matters and looks.. well.. just don't."

HobbyKing Donkey ST2004-1550kv
The mounts are nonstandard ugly aluminum tangs with holes in them.  The sticker oddly says "ST2204-1550kv" whereas the website part number os "ST2004-1550kv".  They have 3mm shafts, but don't include any collets or prop adapters.

But, they're dirt cheap, they work as advertised, and they're seemingly a lot more crash resistant than the similar-rated Park300 1400kv motors I used to use on a similar sized quad.

I had to use 4" zip-ties to attach them to the F330 frame.  I did it by threading the tie down through one hole, under the frame, up through the opposing tang, and then putting a cut off zip-tie "head" on the other end.  Repeat for the other set of tangs and you have a solid mount with no screws.  ;)
Mounted w/zip ties

Paired with some disused Afro 12A ESCs, a MultiWii MicroWii FC, OrangeRX R100 receiver, and some 7x4.5 props and I have a small, super light, fairly agile quad.  It's not the fastest one I own, but it's light and agile enough to do in-place flips or double-descending-rolls.

It turns out to be a joy to fly, and I've been spending more time with it than my more expensive quads.

Several people have asked me for a parts list, so here it is:
QtyItem
1F330 Frame
4Donkey ST2004-1550kv Brushless Motor
4Turnigy Plush 9g 10A ESC
1MultiWii MicroWii ATmega32U4 Flight Controller
1OrangeRX R100 DSM2 Satellite Receiver
1XT60 Male power connector
4Props: 7045, 7060, or 8038 (2 CW & 2 CCW)
43mm prop adapter
1ZIPPY Compact 2200mAh 3S 25C Lipo

A few build notes:

  • Use 4-inch zip-ties to attach the motors (described above)
  • You can use an XT60 to 3.5mm bullets power distribution cable instead, especially if you choose 10/12A ESCs that have 3.5mm bullets.  I built one this way, and one with directly soldered leads.
  • You'll have to bind the R100 to your transmitter with a separate receiver (or by flashing special Spektrum Satellite Bind Code to the FC first.)
  • This quad can actually carry a 2600mAh battery for 10+ minutes of flight time!
  • Add a lipo alarm to warn you when the battery is low.
I have two built right now.

One with 7060 phosphorescent props, UV LED strips on the arms, and a 4W spotlight:




The other with 8038 props, a GoPro Hero 2, Minim OSD board, and video transmitter on it:


5 comments:

  1. how did you mounted the motors to the frame?
    can you send me some pictures?
    email: rayedfarhad007@gmail.com

    ReplyDelete
    Replies
    1. I looped a 4" zip tie down one of the flanges and back up the opposite one, and then secured it on the second flange with the cut-off "head" of another zip-tie. Repeat on the other two flanges to make an "X" pattern.

      Delete
  2. This task could appear straightforward however it needs an excellent quantity of labor and force that ATV winches will simply supply while not a sweat Best ATV winch.

    ReplyDelete
  3. The videos were really fantastic. I impressed with its name; Donkey Quad. Interesting! I didn’t remember but I noticed similar drones reviews for kids somewhere. However, the task seemed to be easy but it really needs an extraordinary size of labor and force for ATV winches. Also the list of parts will be very helpful.

    ReplyDelete

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