[AR] Re: [UK OFFICIAL] Re: NASA test of quantum vacuum plasma thruster (was "Anyone heard of this?")
- From: Pierce Nichols <piercenichols@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 6 Aug 2014 15:19:50 -0700
That's why the pendulum should be a string.
-p
On Aug 6, 2014 3:04 PM, "Peter Fairbrother" <zenadsl6186@xxxxxxxxx> wrote:
> On 04/08/14 13:18, Aplin Alexander T wrote:
>
>> Classification: UK OFFICIAL
>>
>> Handling Instruction: /DISCLAIMER - this is a personal e-mail and only
>> represents only the views of the sender/
>>
>> 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/
>>
>> And
>>
>> http://www.jerrypournelle.com/chaosmanor/dean-drive-and-
>> many-other-matters-a-mixed-mail-bag/
>>
>> **
>>
>> *Alex Aplin*
>>
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