An old mystery from my days as a sailor resurfaced this week. Does air on one side of the sail somehow know what the air on the other side is doing? Sounds strange, but it happens to be a key part of explaining how boats, birds and airplanes work, and it stumps a whole lot of people who should probably know better – including most pilots.
I was reminded of this by Bob McDonald from CBC’s Quirks and Quarks radio show. He was in town to give a talk on “The Science of Everyday Life”. It was clear that this was going to be a show for kids, but I dragged Charlie along for two reasons. First, I was planning on presenting some of my peacock research at a family science festival on Saturday; I thought it might be useful to see a master of this sort of thing in action. Fandom came into it too – the Quirks show is one of a handful of radio programs that got me through my troglobite period of 8 hour days in the darkroom last summer.
I was pretty sure what we were in for – baking soda and vinegar magic for the edification of the grade school set – but I wasn’t prepared for how quickly McDonald would put me under his spell, too. Sitting there cold and hungry in the dingy auditorium, I had forgotten all about my surroundings by the time McDonald was whirling a mop around and keeping a kid trapped in his chair using only his thumb to demonstrate centre of gravity. And he was just getting started. Although the talk was too long at nearly 2 hours, it was worth the wait to see video of McDonald’s adventures in weightless flight at the end. His imaginative pitch for the space tourism industry was another highlight. I was hooked at his concept for a giant rotating space hotel. If we put a cylindrical swimming pool smack in the middle, the water would stick to the outer walls by centripetal forces. You could literally fly around in the air at the zero-gravity centre and dive down in any direction to the water below.
McDonald mentioned something in his explanation of how to make a better paper airplane that brought up an old problem for me.