The drawing is in the Codex Atlanticus:
I knew that this would not be a pretty creature to build - even Da Vinci only bothered to draw one of the wings. So before I committed to the build, I tried a simple version - just to see how it might work in action.
To my surprise - the motion was amazing and so I set about constructing a full size version out of local wood.
Until almost the very final stage of building the wings, I was at a loss to visualize how it would look in final form.
Here it is in final form at the Bungendore Show.
One of the more ugly bits of work I have engaged in. The wings work like the fingers of a hand... the only way it would fly is by pulling itself through the air :) Perhaps something for Qantas to consider as part of its cost cutting.