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Speck 80 - 1s Brushless!
#1
Thanks to Hamster for turning me on to this cool little frame, and to Oscar for the nifty little MX MWC-32X flight controller!

   

Parts list:
Speck 80 frame: RotoriousFPV.com
MX MWC 32-X 1s/2s FC: OverskyRC or Banggood
RotorX RX1102-7800kv motors: RC-Drones
MX-3A 1s ESCs: Hobby King
1.5mm 3-pin JST-ZH pigtails: Ebay
RotorX RX2535W props (cut down to 2 inch): AirbladeUAV
Quanum Elite micro cam/vtx (de-cased): Hobby King
NanoTech 1s 500mAh 25-50C lipos: Hobby King
Custom 3D printed motor mounts: Thingiverse

   

The Speck 80 frame kit comes with a top plate and camera cage (which I did not use), and a nice flexible printed mount for the camera I chose.

The MX MWC 32-X FC is neat but required some special consideration to work with the motors and frame.  First of all, the motor/esc input plugs are 3-pin and requires ESCs work with only one power, one ground, and the signal. (The MX-3As do - there is also a 2s version of these that I will probably switch to eventually.)

Also, the FC's hole spacing was slightly smaller than the mounting holes on the frame, so I filed the holes slightly toward the outside for a good fit. I decided to mount it inverted and it also needed to be rotated.  I decided on 225 degrees to get the battery pigtail where I wanted.  This meant that motors 2 & 3 crossed over under the FC.

    

With the board inverted and rotated 225 degrees, that makes motor connector 3 point forward.  I added M2 nuts on top of the board as spacers for the camera mount.  I had soldered on a small pigtail to match the pigtail on the camera (instead of soldering the camera directly), so I could easily disassemble the whole thing later.

  

Weight without battery is around 44 grams.  Flying weight is 59 grams!

   

I really like the looks of this little guy.

Unfortunately,  when attempting a hover test, motor three would not spin up.  After tearing it apart and testing motor and esc (again), I discovered that port 3 on the board was not working. USB port also quit working (don't know if related or not).  I have a new board on the way, and may go ahead and upgrade it to 2s.  The weight without battery shouldn't change - the 2s ESCs are nearly identical.  I will probably try it on the 1s first though, just to see.... Wink

EDIT:  I think I probably burned that port myself.  Early on, when I was testing motors, I burned out a motor because my mounts exposed too much screw and the screws touched the windings (I think).  It could have been port 3 that I was testing on (not sure).  The USB was still working after that though, so I'm not sure what happened there.
[-] The following 1 user Likes sloscotty's post:
  • fftunes
#2
I want one!
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#3
Me too!
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#4
If you decide to build one and go 2s, you can ask oversky to presolder the correct pads for 2s (can be switched). Also, you'll want these: http://www.banggood.com/MU-3A-2S-Speed-C...00574.html
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#5
I wonder if these will be suitable on 1S: http://www.banggood.com/4X-Racerstar-Rac...mds=search. But it shouldn't be too hard to rewind them for 2S.
These ESCs are way overpriced :-( Also no info on their weight.
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#6
Nice build, first one I've seen with a brushless system. If anyone is interested in buying one make sure you buy from Jack, his previous business partner has copied all of his designs.
Current quad: ZMR 250 / DYS SE2205 / Littlebee 20A ESCs / Drone Lab 1500 4S / Naze32 Rev5 / BF 2.7.1
FPV: Runcam Skyplus / Aomway 200mw VTX / Fatshark DomV1
>>>>>>>>>>Check Out My Build<<<<<<<<<<
[-] The following 2 users Like HamsterFPV's post:
  • Tom BD Bad, sloscotty
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#7
(10-14-2016, 01:12 PM)AndreyM Wrote: I wonder if these will be suitable on 1S: http://www.banggood.com/4X-Racerstar-Rac...mds=search. But it shouldn't be too hard to rewind them for 2S.
These ESCs are way overpriced :-( Also no info on their weight.

I think those motors would work well (wish I'd seen them before the 1102s). The 1102s are 3.5 grams with wires. You would still need to make a mount for the Speck 80 though - the only holes on the frame are ~11mm apart. You'd also need press-fit props or some collet-style adapter.

The MX-3A 1s ESC's I used are 0.38 grams without wires.  I think the form factor of the MU-3A's are the same, so I expect the weight to be comparable.  I agree about the cost. Depending on your flying style and prop-size, you could also exceed 3A (on 2s), but I doubt if I will push it that hard for long enough to burn.
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#8
That looks really tempting! Big Grin glad you found good use of the FC! It would still be sitting in my toolbox if I didn't send it away lol
that thing is tiny, looking forward to your videos
A better FPV'er than LOS'er :) -- My Fleet
[-] The following 1 user Likes Oscar's post:
  • sloscotty
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#9
I just noticed that Banggood has the same FC (different name) for less than Oversky.

http://www.banggood.com/Micro-Scisky-MX-...57409.html

It shows a picture with receiver, but not sure it comes with that. You can add your own tiny rx (there are basic indications of how at Oversky).

(10-14-2016, 11:21 PM)Oscar Wrote: That looks really tempting! Big Grin glad you found good use of the FC! It would still be sitting in my toolbox if I didn't send it away lol
that thing is tiny, looking forward to your videos

I did film my attempted hover, but...well...Big Grin
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#10
If you want to buy a Speck 80, RotoriousFPV now has a web-site - went live today.

http://rotoriousfpv.com/product/speck-80/

I posted a picture of this over on https://www.facebook.com/groups/RotoriousFPVGroup/ a couple of days ago.  It got a good response, and it sounds like Jack is going to design a brushless version of the Speck 80.
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#11
I want to build a copter like this. Can you help me to find 1-2S(both) FC, and need an FrSky receiver. Thanks!
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#12
(11-05-2016, 08:11 PM)KaiotEch Wrote: I want to build a copter like this. Can you help me to find 1-2S(both) FC, and need an FrSky receiver. Thanks!

I think Jack over at rotoriousfpv (see links above) is currently prototyping a modified Speck80 based around the FuriousFPV Piko BLX FC and maybe some (as yet to be released) 2-in-1 stackable ESCs (also from FuriousFPV) with 1104 motors.  You could wait and see what develops there.

I am modifying mine to 2s using the flight controller mentioned in my original post and using the Racerstar 6A ESCs from banggood.  (Not sure it's going to work yet - I'll post results when I'm done.) The Oversky FC can be modified for either 1s or 2s (or you can order pre-setup for which ever you want).  Banggood carries these as well: http://www.banggood.com/Micro-Scisky-MX-...57409.html .  These FC can also be modified to accept other receivers - they support PPM and SBUS with the adjustment of some solder pads.

My replacement board just arrived a couple of days ago, so I'm going to test it on 1s first before I do the conversion to 2s.
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#13
(11-05-2016, 09:15 PM)sloscotty Wrote: My replacement board just arrived a couple of days ago, so I'm going to test it on 1s first before I do the conversion to 2s.

Have you managed to do any testing yet, I would love to see some video to check out the performance of this little guy!
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#14
(12-18-2016, 05:40 AM)Tom BD Bad Wrote: Have you managed to do any testing yet, I would love to see some video to check out the performance of this little guy!

I got it rebuilt, tested, ran into another minor problem, and before I got it sorted out, Jack released the Speck 80 brushless frame mentioned in a previous post.


So I decided to hold off.  This is a lighter, stronger frame and is designed for 20 x 20 FC's (Pico BLX, Femto, etc) and up to 1105 motors.  Mine should be here in a couple of days.  Expect a full report by the end of the year (probably in a new thread).  In the meantime, check out the Rotorious FPV Underground Group (you'll need to join and be approved).  People are already starting their builds.  (Jack released 3 different brushless frames.)
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#15
If someone is interested in building brushless indoor quadcopter from scratch here is an interesting project to look into:
http://fishpepper.de/projects/pepperf1sh/

It's definitely in top 3 on my projects list Smile

Cheers.
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