[Phys-l] The Boat that sails Upwind: The Balloon that blows upwards to rise.

[Brian Whatcott <betwys1@sbcglobal.net>]

You recall the fanciful illustrations of sailors blowing into the sail to
make waves.    An inclined shaft with a small water propeller on the low
end, and a big air propeller on the other end, can achieve something
just as unlikely - it sails directly up wind.

And next, recalling that a released balloon shoots away from the
 nozzle end,  you may be surprised to see a balloon whose nozzle is
 on top, and blowing onto an air propeller, which lifts the whole
contraption 20 ft or so
 (At least in Arbor Scientific's  embodiment)


Brian Whatcott    Altus OK    Eureka!