When launching a ring-vortex, the "launcher" experiences a "kick," and
when the moving vortex strikes a target, it can knock it over. Clearly
the launcher injects momentum into the ring-vortex, and the vortex can
deliver momentum into a target. However, continuity tells us that all the
streamlines are circular. Therefore, as the vortex progresses, no net
volume of fluid builds up anywhere, and for every parcel of air which
moves forward, there MUST another one moving backward.
So, how can a ring-vortex carry any net momentum?
:)
(Note: ring-vortices and vortex-pairs DO transfer momentum, so that's not
where the trickery lies.)
(((((((((((((((((( ( ( ( ( (O) ) ) ) ) )))))))))))))))))))
William J. Beaty SCIENCE HOBBYIST website
billb@eskimo.com http://amasci.com
EE/programmer/sci-exhibits amateur science, hobby projects, sci fair
Seattle, WA 206-789-0775 unusual phenomena, tesla coils, weird sci