What better way of applying the scotch yoke could there be than a project featuring Nessie, the Loch Ness Monster!
I do most of my planning in my head. It might look like I'm sitting around drinking coffee and gazing vacantly into the middle distance but actually I'm working hard! Today I've been working out how the mechanism for a Nessie model could work. I've settled on the above which I reckon is do-able. The Scotch Yoke at the centre of the model drives the dark blue slide back and forth. The circular pins on the slide push into the bell cranks moving the head and tail up and down.
A rack and pinion on top of the slide rotates the two wheel pieces back and forth making it look like the body is undulating through the water.