On Tue, Jan 13, 2009 at 1:00 PM, Anthony Jackson <[email protected]> wrote: > David Scheidt wrote: >> >> You can only sail at the interface of two media. That's normally the >> interface between air and water, but it can be other things. Water >> and water doesn't work; the density difference between the two isn't >> high enough. > > Density difference is unnecessary; it helps preserve the boundary, but if > the boundary exists for other reasons, you can sail as long as you're on the > boundary between two regions with different velocities. > > In practice, this isn't likely to be very useful underwater, but it's > theoretically possible. >
The density difference is what makes it possible to transfer energy from one medium to the other. it's how keels work. -- David Scheidt [email protected] _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
