-p
On Aug 6, 2014 3:04 PM, "Peter Fairbrother" <zenadsl6186@xxxxxxxxx
<mailto:zenadsl6186@xxxxxxxxx>> wrote:
On 04/08/14 13:18, Aplin Alexander T wrote:
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Jake Anderson:
I do like the idea of the test being done in basically a
clear bell jar
inside a (large) Faraday cage.
I also like the pendulum, however I'm less keen on the piezo
pressure
sensor.
I suggest a laser interferometer aimed at the pendulum.
If you want to verify thrust in a direction put 2 test
devices on it,
have the oppose each other, turn one on you should get a
displacement in
one direction, turn it off you should return to zero, >turn the
other on
displacement in the opposite direction, you don't need to make any
changes inside the test device to perform the test which is nice.
FWIW Jerry Pournelle (SF author and former aerospace engineer who
previously encountered the ‘Dean Drive’) is also pro the
‘pendulum in
vacuum’ test method:
I don't think that's enough - at the least you need two joints, one
at the top and one at the bottom of the pendulum arm. Otherwise a
clever fraudster could simply move the center of mass of the
drive/bob to one side, and the arm would tilt.
Worse, even a two-joint arm would not be enough - a suitably
oriented attitude control gyroscope could still cause the main arm
to tilt.
I'm not sure even three joints is enough, though I'm not certain of
that - spinning up a gyroscope might cause a tilt for long enough
-- Peter Fairbrother
http://www.jerrypournelle.com/__chaosmanor/dean-drive-and-__nasa/
<http://www.jerrypournelle.com/chaosmanor/dean-drive-and-nasa/>
And
http://www.jerrypournelle.com/__chaosmanor/dean-drive-and-__many-other-matters-a-mixed-__mail-bag/
<http://www.jerrypournelle.com/chaosmanor/dean-drive-and-many-other-matters-a-mixed-mail-bag/>
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