Vortex Cannon part 2

My driveway is starting to look like a playground!  I spent most of today attempting to cut perfect circles out of plywood. Not as easy as it sounds. 

 These “rings” will become the rear membrane, and front apertures, for the vortex cannon.  (Here’s a link that shows what a vortex cannon is https://www.youtube.com/watch?v=r2qsVj2kXrQ)

The two rings below will be mounted on the front of the cannon and will create a 20-inch diameter smoke ring!

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© Mike Alberici 2014