The boat analogy seems particularly poor. a) Comparing a sailboat on a windy day to a sail boat on an [implied] non-windy day? Surely the boat with no wind wou

The boat analogy seems particularly poor. a) Comparing a sailboat on a windy day to a sail boat on an [implied] non-windy day? Surely the boat with no wind wouldn't even have a circle. b) I'm no boatologist, but if the wind is X knots, then the boat can travel downwind at a rate of X knots, but contrary to what the article states, the boat would be able to travel cross-winds at some multiple of X. So you would get something resembling an oval, but in the opposite orientation as depicted. Also, it's worth pointing out that it's perfectly possible for a boat to travel "into" the wind via "tacking and jibing"