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Old 10-24-2010
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I try to have open mind about it.

Few centuries ago people believed the earth is flat and a sailboat can sail any wind angle from DDW to reaching (close to 90%), but not higher.

I understand that the wind force is not linear with wind speed but squared and here apparent wind helps to create some healthy forces.
The sailboat can sail faster then true wind, but I understand not faster then apparent wind.

I have problems understanding this part:

Let us say the vehicle is traveling DDW.
Slower then the wind. It accelerates.
It reaches the speed of the wind.
What apparent wind does it have at that point? 0. Nada. Zero.
So, what the hell is turning the prop at that moment?
If there is no force from the wind it must come from somewhere else or we could make wind turbines to generate electricity in no wind.
I must take a closer look at this. At first glance it seems not possible.
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Beneteau Oceanis 473

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finished cruising after two years.
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