General > General Technical Chat
Mess with your minds: A wind powered craft going faster than a tail wind speed.
Brumby:
--- Quote from: IanB on September 05, 2021, 04:25:30 am ---I think there is not much point demonstrating things with experiments, because if people don't like what the experiment shows they will find reasons to dismiss what they see.
--- End quote ---
--- Quote from: Psi on September 05, 2021, 05:17:14 am ---Sure, some have definitely made up their mind and wont accept any evidence. but i don't think that describes everyone.
--- End quote ---
I'm with these guys ^^^^^^^
Alex Eisenhut:
--- Quote from: Brumby on September 05, 2021, 10:35:48 am ---
But that seems to be a subtlety beyond your comprehension.
--- End quote ---
He sounds like the kind of guy who will argue that no one should use a dead carbon-zinc battery when learning Ohm's Law ... and will describe fifteen different kinds of batteries.
Then after six weeks of exhaustive and exhausting explanation, will reluctantly agree that the battery is just an illustration...
Then just as everyone is ready for lunch, he'll say "yeah but no one uses incandescent lights anymore!"
iMo:
--- Quote from: jeffjmr on September 05, 2021, 12:28:41 am ---.. The sailboat sail is not traveling along the same vector as the wind. The propellor on this contraption is. At ground speed equivalent to wind velocity, there is no longer any wind force being applied to the propellor airfoil, unlike a tacking boat sail. ..
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A blade of the propeller has got an angle of attack (like 10-20 degrees), where the blade then works as the sailboat's sail when tacking. The propeller is then self-tacking while rotating. The "by tacking created" energy is fed into the storage (the Blackbird's body) and the wheels (via the proper gear) may speed up the craft (minus losses in the friction which are rather high)..
For example, with an IceBoat (where its 3 runners do not slip on the ice but keep the direction) while tacking the IceBoat's sail you may travel up to 5x speed of the wind (people say)..
Brumby:
--- Quote from: Alex Eisenhut on September 05, 2021, 11:59:32 am ---He sounds like the kind of guy who will argue that no one should use a dead carbon-zinc battery when learning Ohm's Law ... and will describe fifteen different kinds of batteries.
Then after six weeks of exhaustive and exhausting explanation, will reluctantly agree that the battery is just an illustration...
Then just as everyone is ready for lunch, he'll say "yeah but no one uses incandescent lights anymore!"
--- End quote ---
:-+ Well said!
Labrat101:
--- Quote from: Brumby on September 05, 2021, 10:35:48 am ---This perfectly illustrates the fact that you have no clue about the actual processes involved. You should be embarrassed - but I doubt you will.
--- End quote ---
For sure not . I'm jealous. That I could No way match your supreme gift in Scepticism.
But I am sure with just a little more help we will succeed in advancing you To the higher level .
Not just a mere, Supporter of Scepticism .. Upgrade To :: Major Sceptic looks far better .
But be warned with Great Scepticism comes apparently No responsibility .
So there maybe a time when you can't believe yourself .
:popcorn:
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