[amsat-bb] NO EJECTION MASS Propulsion
antonio at qti.qualcomm.com
Mon Aug 4 23:41:18 UTC 2014
At 03:54 PM 8/4/2014, Robert McGwier wrote:
>I hope they aren't wrong because they clearly don't understand how it
The result is surely wrong.
When measuring MICROnewtons, from a device that's going to be getting
very hot (because the microwave energy is dissipated in the walls of
the cavity) you may need to do the experiment in a vacuum, to avoid
air convection confusing the experiment. In any case, they say they
worked on the experiment for 8 days, which is not enough time to
figure out all the engineering aspects of the experiment.
They did the test in a vacuum chamber (which means they must have
been thinking along the lines of my statement above about convection,
but they did the test with "the door closed but at ambient
atmospheric pressure". Maybe they didn't have enough time to do the
tests at vacuum.
If they have resources to do more work, clearly pulling a vacuum on
that chamber is the next thing to do. I predict that the thrust will
disappear as the air is pumped out of the chamber.
However, of course I'm not absolutely sure its wrong. I'll be very
happy if it turns out to be correct.
My bet, however, is firmly on the no side.
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