[ProudVet77]

I'm a keelboat sailor myself. ;)
But also I wonder how you get more pressure on one side of a sail than the other in a vacuum. Does the solar wind keep the telltales lifted on the leeward side of the sail. ;)

[Redleg Duke]

I think that the "sailing analogy" can only hold up so far.

This is definately for the trading tub that can only go before the "wind".

I am reminded of a SciFi novel I read once where they used "magnetic winds" to travel between stars and planets. They were currents in space and the ships used the magnetic fields of the planets to land and take-off, thus limiting them to landing fields between the poles and the 45 degree latitudes.