Gaby De Wilde said:
Carl Fogel said:
And you can make a traveling windmill move into the wind on a track in
the same fashion, with enough wind and enough gearing between the
wind-driven propeller and the cogs driving the machine along the
track.We can discuss it can we not? We can share our thoughts and patch our
errors.
Carl has plenty of things to keep him busy other than trying to
disabuse a willfully deluded person of his notions.
Quoted message said:Cousteau's Calypso could propel it self up wind. Doug also said it has
been done already even with the gearing.
According to what I've read, Flettner boats can tack at less than 30
degrees from the wind, because their rotors generate a net force
vectored at 90 degrees to the direction of airflow. That's
interesting, but it's not traveling directly upwind. Only from you
have I seen a suggestion that they could travel directly upwind. And
if you'll forgive me this judgment, you have been sipping from some
tainted sources of information.
Note also that turning a rotor to generate an aerodynamic force isn't
something you get for free, any more than turning a wheel to generate
a reaction force against the road is something you get for free.
Force times distance equals work. Flettner boats use more power to
turn their rotors than they would to get the same performance with a
conventional screw.
http://en.wikipedia.org/wiki/Flettner_ship
I'll guess that if a Flettner boat has been shown to travel directly
upwind, that such movement would have been made possible by water
currents in a direction different from that of the wind.
Quoted message said:going faster as the wind directly down the wind is also possible.
Going downwind faster than the wind is, by definition, going upwind
(along with higher surface friction/rolling losses than if you were
simply traveling into the wind as it blows relative to the ground).
All the wishful thinking in the world does not change that, and I'll
believe it no sooner than I see it.
Quoted message said:We know insects use vortexi for flight.
<...>
Quoted message said:Insects would be using that what works best.
If what you are suggesting worked best, insects would not have to flap
their wings nearly as much as they do. You should tell them they've
got it all wrong.
Chalo