Servers by jDrones

Synchropter project

(Pitt) #1

Just decided to show off this 2 years project.
Reasons: build a tailless helicopter because they look bad@$$ and just because I can.

I don't take a lot of note and photo, These are all pics I have.

Project start: ‎July ‎19, ‎2015
Some line drawings (initially designed to use 4 servos)

‎September ‎3, ‎2015
Decided to start with the most difficult part, the custom bevel gears that mesh at 25 degrees.
This pair of gears proved countless people wrong about capability of 3 axis CNC

September ‎13, ‎2015
More details in

‎September ‎20, ‎2015
Made a prototype frame from acrylic

September ‎24, ‎2015
Bearing blocks

‎October ‎12, ‎2015
Came up with more practical design

‎October ‎18, ‎2015
Access to "real" CAD software

November ‎12, ‎2015

‎November ‎24, ‎2015
The finalized design

‎December ‎21, ‎2015
Getting real!

March ‎8, ‎2016
2nd most difficult part: Rotor heads
The blade grips need angled arm to avoid blade strike = custom made

Table top CNC isn't going to make them like magic
This is Fail compilation, total of 4 failed attempts (3 are human error :stuck_out_tongue_closed_eyes: )

A pair needs to be made on the same Al block to ensure that they are identical and balanced

April ‎3, ‎2016
Finally usable grips!

April 5, ‎2016
Now, the center hub

I consider this the trickiest part to make on 3-axis machine....and they all failed

None of these hubs work,
Loose on shaft,
shaft won't fit,
spindle not perpendicular.
no matter what tools I used to flip the work piece, there are coordinate errors
It's impossible to make without 4th axis :weary:

August ‎22, 2016
"If you can't flip it, mill both sides at the same time!"

//Run out of photo uploading space
continuing next reply

Synchropter build need help
Chinook heli support in ArduPilot
(Pitt) #2

What the rotor heads look like:

The curved mixing arms fix non-linearity of angled grip arms.

‎July ‎21, ‎2016
Made an upgraded version of bevel gears: "Zerol Bevel Gears" with metal bushing

August ‎28, ‎2016
"The Grand Assembly"

‎September ‎4, ‎2016
The landing skids (legs) no photo available

Til this date, I still had no idea what flight controller I could use

September 19, 2016
Joined :sparkles:
See my discussion here:

‎December ‎1, ‎2016

‎December ‎24, ‎2016
First Lift Off

Video nowhere to be found

‎January ‎24, ‎2017
Telemetry set

‎May ‎6, ‎2017
Testing Here GPS
By mounting GPS on top in Cube's former place, Cube got moved below the frame.

This was when the magic happened
Vibration level halved

May ‎8, ‎2017
Decided to make new lower frame that allow Cube to be mounted inside.

Final Design

May ‎17, ‎2017
Start working

‎May ‎23, ‎2017

May ‎31, ‎2017
"I wanna mount a camera"

‎June ‎29, ‎2017
First Loiter

‎July 2‎4, ‎2017

To be continued

(Pitt) #3

Fail Compilation
These are either defective, outdated, incompatible or broken parts

(Nicolas Chaslot) #4

that's an amazing job and project!

In the end, waht firmware are you running on this baby?

(Pitt) #5


I'm using modified 3.4.5 right now.
Will move to 3.5 as soon as it is stable.
I just don't want to work with code everytime 3.5 rcxx is out.

(Olivier Brousse) #6

Outstanding and truly exceptional, thanks for sharing!
You first loiter is also amazingly stable.

Btw, 3.5 is out now :wink:

(rmackay9) #7

This is a super cool helicopter. I've seen the video before I think, really impressive!