"Martin Gregorie" wrote in message
...
On Sun, 14 Aug 2011 14:34:37 -0700, sisu1a wrote:

Interesting article about Duke engineers applying their passive,
engineered material light/sound cloaking techniques to water,
theoretically (substantially) reducing the amount of drag generated by a
boat's hull by 'tricking' the surrounding water into standing still.

http://www.eurekalert.org/pub_releas...-esw081111.php

It will be interesting to see if it works, but I don't think it will help
us much, apart from the possibility of reducing friction drag in the
fuselage. The reason: since the whole point of this cloaking seems to be
to prevent momentum transfer to the surrounding fluid while a wing
generated lift by transferring momentum to the surrounding air, it ses to
me if you put the stuff on a wing, it would stop the wing from doing
anything useful.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

Are you saying, then, that the velocity of the air moving over the top of
the wing will be reduced relative to that over the bottom? What would
Bernoulli say?