I am looking at a submarine with sail the submarine has basic engine to get the ship in/out of the currents and basic positioning here are some image of the same idea but for air travel http://www.orionsarm.com/worlds/AIRSHIP2.JPG http://www.nuclearbabies.com/wiki/_media/images:3d:airship.jpg?id=gallery http://www.bigredhair.com/airships/theKite.jpg
----- Original Message ---- From: Susan Koziel <[email protected]> To: The GURPSnet mailing list <[email protected]> Sent: Wednesday, 14 January, 2009 6:06:24 AM Subject: Re: [gurps] underwater sails Well if you were an underwater creature you could use a sail like object to maneuver via placing a sail in a under tow or counter current, as there are water organisms that basically move like that.... But not being personally a sailor type what the heck is an under water sail; and why do you need a density difference for a sail... doesn't a sail work because the wind fills it an pushes a vessel along a surface - and wind has a velocity that you are harnessing, and the surface has less resistance then the force the wind exerts over the area of the sail. Density of the wind or the water has nothing to do with it. I've "sailed" using roller blades and a kite like object while in my "sounds crazy lets try that" years. -Sue-definately not a physics person nor a sailor --- On Tue, 1/13/09, David Scheidt <[email protected]> wrote: > From: David Scheidt <[email protected]> > Subject: Re: [gurps] underwater sails > To: "The GURPSnet mailing list" <[email protected]> > Received: Tuesday, January 13, 2009, 11:08 AM > 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 _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l Stay connected to the people that matter most with a smarter inbox. Take a look http://au.docs.yahoo.com/mail/smarterinbox _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
