[AR] Subject: Re: NASA test of quantum vacuum plasma thruster (was "Anyone
- From: John Schilling <John.Schilling@xxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 07 Aug 2014 23:04:10 -0700
Date: Fri, 08 Aug 2014 00:18:41 +1000
From: Jake Anderson<jake@xxxxxxxxxxxxxxx>
Subject: [AR] Re: NASA test of quantum vacuum plasma thruster (was "Anyone
It is an "unbalanced force", in every case F = MA if something pushes in
one way it is balanced by something pushing in the other.
If the thruster worked, sure it took power in, but it produces a force
without pushing on something else and from there there are any number of
ways of turning that into perpetual motion.
I do still wonder where a photonic system fails and I'd really like to
hear an explanation for why it would, though I fear the answer involves
actual numbers not just abstract thought to work. ;->
Well, we can apply some abstract thinking to the concept of "work":
Work = Force x Distance. Power = Work / Time, and Speed = Distance / Time,
thus Power = Force x Speed.
If you've got a gadget that produces force F, and you couple it to a
generator whose armature moves at speed S, then simplistically you ought
to be able to get power P = F x S out. If that's more than the power you
put in, there's a problem.
So, solve for S, i.e. Speed. For any supposed reactionless thruster,
there is a critical speed beyond which attaching that thruster to a
generator results in a perpetual motion machine. That speed is equal
to P/F.
For the best EMdrive allegedly tested in the paper, that speed is about
50 km/s. Practically irrelevant, but still theoretically troubling.
For the EMdrive allegedly predicted by theory and tested by the Chinese,
that speed is only 2.5 km/s. We can actually build flywheels that spin
that fast if we really need to. The Chinese are instead still building
coal-fired powerplants.
For an ideal photon drive, P/F comes to exactly 299,792,458 m/s.
Sound familiar? Yep. A photon drive becomes a perpetual motion machine
the moment you attach it to a generator whose armature moves faster than
light, and no sooner.
Conservation of Momentum, Conservation of Energy, Special and General
Relativity, they've all got each other's back.
John Schilling
john.schilling@xxxxxxxxxxxxxx
(661) 718-0955
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