@Cycloptichorn,
Quote:Are you in agreement that a sail, tacking continuously, will outrun balloons in a similar wind - even accounting for the fact that the ship experiences drag that the balloons are not?
Do I think it is possible not will do so to have an iceboat or very fast sailboat tacking from side to side and to beat a free floating balloon?
Yes and for the same reason as I had said before if you can store energy in some manner you can beat the wind using the wind to do so.
By tacking and therefore maintaining a relative wind for most of it journey you can build up store energy in the form of 1/2mv^2 and then used that energy to form an average vector velocity greater then the wind in the wind direction. You are losing a large amount of energy in changing the velocity vector from side to side but I see no barrier for it being done.
Now take note for this to work you need to go to a great deal of trouble to maintain a relative wind most of the time.
No iceboat or sailboat can just head downwind however and beat the wind and no wind car of the type given can just head downwind and beat the wind either.
For the simple reason that once you reach the wind velocity on the same vector as the wind you have zero relative wind and therefore force and therefore energy to increased the speed over the wind velocity.
Chain driving the prop to the wheels give you nothing in this regard.