I have been building a variable pitch tricopter and wanted to share my results so far.
Basically - I chose a tri and not a quad, because the tri geometry is the same as a traditional heli 120 deg swash plate. Since I can't write a firmware on my own, I wanted to use an off the self solution.
I used a home made simple frame
3 e-flite park 370 hollow shaft motors with their variable pitch props
3 castle ESCs that I had laying around.
Here is a video of the tri on a table
Here is a list of my various attempts
This allowed me to fly and hover, but very touchy
Check out the video above - and now I need suggestions .
I think one point is I need to redesign the pitch servo so that I use more of the servo throw, but mechanically reduce the movement - I have lost a lot of resolution using such a narrow pitch range in mission planner