Further progress on using four bar linkages to drive wings. I've tried a variety of different geometries, finally settling on this layout. The dimensions of the bars are shown in the final image.

Having decided on a wing geometry I've opted to drive the wings using a crank slider mechanism. Rather than re-inventing the wheel my first prototype is made using the simple crank slider project which can be downloaded here. The only thing that I changed was to increase the throw of the crank slightly.

The wings are driven by push rods connected between the slider tube on the box top and the centre linkage on the wing.

The four bars of the wing linkages are clear in a front view.

Next to add the wings to some sort of character. I'm torn between a flying fish and a flying cow…