Contra-rotating propellers Mod for the printable singlecopter.
How are getting the counter rotating effect?
They make small dual motor setups specifically for this.
Check this out: http://www.hobbyking.com/hobbyking/store/__6565__Contra_Rotating_BL_System_375W.html
Like others @Yang1 , interested in how you’re getting the counter-rotation happening here.
It appears that the first picture shows it. He’s missing the top plate which rides on those bearings.
When the top plate spins one direction, against those bearings, they will naturally roll backwards. The trick is that they are captured in place by the lower blades carrier (the brass ring) and will naturally follow the bearings backwards. (As if to plates were moved against each other with pencils in between.)
It’s not a direct drive coupling… but requires the friction of the parts to transfer the motion. Not efficient, but should work just fine in stabilizing the craft.