This project was started in , electronics and control loops. Because I always need a cool project to learn new things, it was clear that something that can fly had to be built.
The project started as a "tricopter-only" project, but as I wanted to build smaller vehicles with more payload capacity, I decided to make some quadrotor, hexacopter and Y6 hexacopter firmwares too. My main interest is to build very small MAVs that fly as good as larger ones (or even better) and that can be controlled by wireless video link. I also experimented with autonomous flight in GPS-denied areas (video), and with GPS assisted autonomous hover (video).
-- William

Contact: Shrediquette @ g m x . d e --- All content published under CC Attribution-Noncommercial-Share Alike 3.0 Germany

GEMiNi test pilots

... early view of the prototypes:

  • First flight: May 2013
  • Max. dimension: 47 & 47 cm
  • Camera: Organic stereoscopic view, fixed focus @ 30 cm
  • Weight: 2650 & 2850 g
  • Endurance: 3-4 hours, then needs to be refueled. Most of this time is spent in standby. People told me that the endurance will increase with time
  • Highly efficient low battery alarm
  • Fully organic fuel
  • Batteries should not be overcharged, excess energy will be spilled out through the inlet. Unused components of the fuel will be discharged via the outlet
  • Position hold works perfectly, waypoint navigation is coming soon
edit: About one year after the first flight, we have now successfully implemented waypoint navigation (the speed is increasing with every day), obstacle avoidance (still some bugs in here, control loops need to be tweaked a bit), formation flight, and a (still to be enhanced) voice recognition feature. 


  1. Hallo William, herzlichen Glückwunsch. Die neue Generation .
    Grüße aus Berlin Mike RCHHB

  2. Congratulation William .! , Taz