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Re: [Phys-l] Another YouTube hoax?



The "propulsion" method may include, as an artefact, negative feedback.

bc, writing from ignorance.



LaMontagne, Bob wrote:

I was late picking up my email today - I apologize if I am repeating
what others have said.

As well as being a licensed pilot, one of my major hobbies is radio
controlled planes and helicopters. I know of no devices of that size
that can hover with that degree of stability without constant control
input. (There is an autopilot device that can be placed in RC planes,
but not helicopters or hovercraft.) There is nothing in the movie that
shows how the device could be actively controlled - just the connecting
wires to maintain the high voltage for the coronal discharge.

I strongly suspect that it is simply suspended, but it is still a
fascinating movie.

Bob at PC


-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Bernard Cleyet
Sent: Thursday, February 08, 2007 12:38 AM
To: PHYS-L Maillist; tap-l@lists.ncsu.edu
Subject: [Phys-l] Another YouTube hoax?

Or just impractical?

http://www.youtube.com/watch?v=Ta1wO8EcERY&NR
<http://www.youtube.com/watch?v=Ta1wO8EcERY&NR>

bc, thanks an anonymous friend
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_______________________________________________
Forum for Physics Educators
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