Brocopter Y3: foldable mini tricopter

by KipK, published

Brocopter Y3: foldable mini tricopter by KipK Aug 10, 2014

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This is a mini 250 foldable tricopter dedicated for fpv.
Video: http://vimeo.com/105471252

Parts are available on Shapeways here

RCGroups thread
If you feel generous enough, you're welcome to make a donation.

Yaw mechanic is protected between the center plate, the whole rear arm turn itself. ( http://youtu.be/u28iwAkf9TA )

2 camera configuration possible:

  • FPV cam on top with Mobius between plates. There's a hole to access the mobius button from the bottom plate.
    This way you can tilt the fpv cam a bit.
  • FPV cam between the center plate and Mobius and the anti vibration mount on the top.
    Motor mounts are for Tmotors 1806 & clones ( I use RCTimer ones ) , or you can use the bigger one that fits for Sunnysky 2204 & co.
    Use 6" props with 3S or 5" with 4S.

You'll need small ESC, there's not much space on this little beast. Kiss esc are perfect for that.

Here's a video of the yaw mechanics:


Most parts are printed with 0.2mm resolution.
Motor mounts & arm mounts needs supports.
I print the Yaw_arm_horn.stl with 0.1mm, it's better, but not necessary.
You can also print the center plates it works good, but it's better to cut them with cnc using G10 or Carbon.
You'll also needs:

  • 2x 19x10x7 bearings for the yaw axis
  • 1 micro servo ( the one I use is MKS DS450 22.5x10x23.5 mm )
  • some 10mm carbon tubes
  • M3 screws: 4x45mm , 4x30mm , 2x15mm
  • 10xM3 nuts + 2 threadlock M3 nuts.
  • 3.5x3.5 flight controller
  • 25x25 fpv camera or Mobius cam or booth.
    Cut 2x90mm carbon tubes for front arms, and 105mm for rear one if you use 5" props and want it minimal, or 2x100mm fronts & 1x115mm rear for 6".

Add a bit of tape on the end of the tubes to give some friction on the motor mounts and front arm mounts. This is quiet sufficient to fix them and will prevent breaking some parts in case of crash ( mounts will turn absorbing a bit of the shock ).

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Great project! FYI the "Kiss ESC mount" fits DYS SN20A/BL20A esc's perfectly as well.

Any chance of modding the file to have it accept a 12mm carbon tubes vs 10mm? Got spares from building http://www.thingiverse.com /thing:958541 This looks to be a fun project.


Anyone here who can provide the carbon plates?

KipK - in reply to extera

I have some CF plates. You can PM me. Cheers

Great design! I want to throw it in a backpack (school messenger bag) and noticed (on the 8th photo) that the arms were very wide even when closed. Is this just demonstrating that they can close, or is that as far as they can go? If there is something blocking the arms, what might it be and is it possible to go without? Either way, I love the design. Thanks!

What's the suggested length on the 10mm CF tubes?

(It says the length in the Instruction tab)

Yes sorry. I missed that for some reason.

How thick are your carbon fiber plates?

KipK - in reply to albill

I use 1.5mm CF.

This comment has been deleted.
Mar 4, 2015 - Modified Mar 4, 2015

what is the naked frame weight ?
also the top and bottom dxf file is broken at the front

Whats the biggest size we would need to be able to print?
Estimated cost for an up and running kit, for someone with only a lipo charger?

This comment has been deleted.

Hi! First of al, amazing design! Congrats!!

And now, one question, how do you power the fpv cam? From the vídeo tx? Is his output filtered?


It's powered from the 5v filtered output of the immersion RC VTX.

Instructions is not clear. Do you have any build videos? Also, please specify how many pieces of each part we need to print. Thanks!

We keep on building! Check out our progress! http://loganshobbies.com

Pipe, with long,? thick,?

Pipe, with long, thick,?

Hey! Logan and I are excited to start our build of the BroCopter! We'll be posting updates on Logan's website! http://loganshobbies.com

I love this little thing ...! do you sale kits ?

Did you cut the CF plates yourself? I am printing the parts for this as I have some spare Turnigy motors and ESCs, but my printer's bed is too small to print the larger of the base plates.

KipK - in reply to sethmo

yes using a CNC. I still have some carbon plates already cut if you're interested.

salut, j'ai vu que tu etait francais, je pourrais savoir où tu as fait decouper tes plaques ? et aussi a quel prix tu vendrais celles que tu as ?


Je fais faire ça chez un usineur local près de chez moi.
Les plaques découpée en 1.5mm carbone 3K sont à 55€.

Really Nice Design. I've never seen nice one like this.

Awesome design! I'll print one when I have more time! Thanks for sharing!

Great design. I'm really impressed with the tail servo solution.
I noticed that the KISS ESC's don't have a 5V BEC. How are you powering the control board and the servo?

KipK - in reply to Boxx


There's a 5V 1A Recom hidden near the fc case.

This comment has been deleted.

Love your Antenna mount !!!

Glad you've commented back, I was trying to find who I've grabbed it from without success.

Credits restored :)

Awesome! Thanks so much.

Aug 12, 2014 - Modified Aug 12, 2014

DXF has been posted few minutes before I read your comment, :)

I use 1.5mm plates, should be ok.

Excellent design. I have been working on a 250 size tricopter myself, and have never been happy with the yaw mechanism. I love how you enclosed the servo in the frame. I am a bit new to the CAD/CAM world. I have access to a mill, how would I go about cutting the plates from the provided .stl files? (I only have experience cutting with .brd and vector files) Do you have the original vectors you used for extruding the plate models or is there a simple way to generate 2d cut paths from these 3d models? Thanks in advance for any help.


I've just posted some more pics on the RCGroups thread with some 3D views of the parts fiting together.

awesome. thank you very much.

Aug 12, 2014 - Modified Aug 12, 2014

Nice one. Really a sweet design. Like the inside servo a lot.
Would you mind uploading an assembled file in any common format like stp or similar? Having a little trouble with understanding the rear setup.