Looks like someone will be attempting to break the Greenbird record next spring:...
Even more related old stuff. I mean really old (year 1335): http://www.notechmagazine.com/2009/07/guido-vigevanos-wind-car-1335.html [IMG]
Found some related old stuff: Bernhard Schmidt (http://en.wikipedia.org/wiki/Bernhard_Schmidt) tired to patent a Windmill driven upwind boat...
I think this whole argument was a semantic one. By "theory" Rick W. apparently means a "numerical investigation based on real world parameters"...
I don't really want them seamless. It could be more confusing than helpful. I made a DDWFTTW-version now: vVMqa7Mft0k And here the downwind VMG...
It is interesting to see where people get stuck on this counter-intuitive stuff, and how they eventually overcome the block. This gives you new...
I assume, that many in the sailing community had this idea independently. John Perry described the puzzle in 2002 using this analogy: [IMG]...
I agree, but many people fail to grasp general principles and to apply them to other situations. They accept the reel but not the wind cart. Some...
The wheels are breaking (backwards force), but the forward force on the prop is higher due to two reasons combined: a) prop is rotating driven by...
Before you bet any money against spork you should have a look at some animations that explain DDWFTTW, and are intuitively easy to understand: 1)...
Additionally to the vector drawings the wedge analogy might be helpful. Here it is for a tacking sail-vechicle:...
