Contra

My 3D Model of John Rutters excellent Design:

http://www.traplet.com.au/copy-of-contra

Same DNA: https://www.youtube.com/watch?v=sHCO0MQWnt8

Simpler RC-Twin (optional): https://www.flitetest.com/articles/ft-dart

https://forum.flitetest.com/index.php?threads/unofficial-ft-dart.39452/

https://www.thingiverse.com/thing:2867311

Arduino Wallplotter: https://www.rcgroups.com/forums/showthread.php?1615202-Turtle-One