Ahh, ok. That clears up the contradition. Thanks. Me: jehardiman: Well, if your "moving water and still air" vs "moving air and still...
I not asking you to go into the details JE, but is there someway to instrument a sail to know when it's acting as a prop or a turbine? Could we...
You appear to be contradicting yourself: First you say relative to the drawings: Then you say: There's no "depends" in your above...
Me: So If I understand your response, you're saying that when a boat sails upwind, its sail is acting as a propeller and "increasing the...
jehardiman, I'll ask a more precise question through pictures: Could you tell me for the following examples, whether the sail on the boat is...
My best cart will run faster than the wind in as little as 2.7mph. It will not self start at those speeds however. Bigger prop didn't have...
No, I'm not caught up with any "absolute". I'm giving examples that I find relevent. For the sake of this discussion, I've as comforable with...
We have several outside of security here at SFO. Unfortunately, they all run too slow for my cart. Would absolutely love to throw our cart on a...
You're apparently misreading the poll and OP question ... it doesn't ask if a sail *is* a turbine or prop. It asks what it *acts as*. In other...
There's three options there ... two "always" and one "depends". No one is being a tyrant forcing anyone to choose "always". I myself fell...
Spork: jehardiman: Wow, just wow. You do see the "operating in the normal way" in sporks assertion don't you? -- we don't "normally"...
Rather than "foolish", I prefer the term "ignorant". I don't find any discussion which elicits interesting information "foolish". Many place...
That's been done to death on this thread -- just because you insist on seeing math that says "it can't be done" while excellent math minds produce...
ROFLAO!! -- and you know this how? We've presented plenty of physical evidence other than "some videos". Anyone who wants to see it in person...
Sort of like this drawing? JB
For the purposes of the above poll, here are the definitions: "Sail" excludes spinnaker but includes any typical/traditional sailing rig on any...
Perfect example of still not engaging. JB
Seems Guillermo is holding out on us over here on Boatdesign.net http://www.advancedphysics.org/forum/showthread.php?t=10550 Either that...
Well, it never acts as a turbine, but it's definitely *part* of a "power recovery system". In this case, the prop does some work on the air...
Please, for the love of PETE pay attention to the location of the flag before you make such comments. Following are two stills taken from the...
