Nasa impossible’ thruster

Joined
Jan 4, 2003
Messages
3,203
Location
Southeastern, PA
No vacuum is absolutely pure. Something in me wants to say it works by propelling any atoms in the chamber out the nozzle at incredible velocities.
 
Joined
Sep 7, 2010
Messages
2,235
Location
Oswego, IL
Quote:
From the story: the scientific community laughed at him. They said it was impossible, that it was based on a flawed concept, and couldn’t work because it goes against the laws of conservation of momentum.
That statement is not true. A scientist would know that the conservation of energy and momentum does not apply here. That law of physics is completely true. You cannot, ever, violate it. However that's only true for a CLOSED system. That is, any system (solar system, star, wrist watch, anything you want) which does not receive energy (or mass) from outside the system is closed. In this case, energy is being delivered into the system, via electricity. It even mentions solar panels. The planet works the same way, Earth is not a closed system. That's how we have so much life here. We eat meat and plants that get their energy from the sun. Everything here is solar powered, even you.
 
Joined
Dec 12, 2002
Messages
43,672
Location
'Stralia
I don't think it's the flashlight in a vacuum analogy...the resonant chamber is (apparently) closed at both ends, meaning that there's no escaping particles/photons to provide the thrust. They seem to be creating some sort of intertial effect from the microwaves, like standing on a skateboard on a frictionless surface, and swaying one way an back, but getting a different result in one direction than the other, generating a nett thrust. http://www.wired.co.uk/news/archive/2014-08/07/10-qs-about-nasa-impossible-drive http://en.wikipedia.org/wiki/EmDrive An EM drive "brick" would be apparently heavier in one direction than the other edit... http://themittani.com/news/nasa-tests-impossible-space-engine indicates that it's a sealed unit, no photon "exhaust"
 
Last edited:

MolaKule

Staff member
Joined
Jun 5, 2002
Messages
22,374
Location
Iowegia - USA
Quote:
Various hypotheses and theories have been proposed explaining the underlying physics for how the EmDrive and related designs might be producing thrust. Shawyer claims that thrust is caused by a radiation pressure imbalance between the two faces of the cavity caused by the action of group velocity in different frames of reference within the framework of special relativity.[37] Yang from NWPU calculated the net force/thrust using classical electromagnetism.[13] Harold G. "Sonny" White, who investigates field propulsion at Eagleworks, NASA's Advanced Propulsion Physics Laboratory, speculated that such resonant cavities may operate by creating a virtual plasma toroid that could realize net thrust using magnetohydrodynamic forces acting upon quantum vacuum fluctuations.[38] Likewise, the paper describing the Eagleworks test of the Cannae drive referred to a possible interaction with a so-called "quantum vacuum virtual plasma".[14] This reference has been criticized by mathematical physicists John Baez and Sean M. Carroll because in the standard description of vacuum fluctuations, virtual particles do not behave as a plasma.[39][40]
http://en.wikipedia.org/wiki/EmDrive Okay, the inventor says that "...thrust is caused by a radiation pressure imbalance between the two faces of the cavity caused by the action of group velocity in different frames of reference within the framework of special relativity." Sounds like the Lorentz acceleration theory to me. Others claim, the thrust is caused by quantum vacuum virtual plasma. Yet, the mathematical physicists John Baez and Sean M. Carroll sys, "..in the standard description of vacuum fluctuations, virtual particles do not behave as a plasma." So this is still controversial and until it is tested in a vacuum we won't know if there is real thrust is being generated. And apparently we don't really know the true theory behind this device. In a patent application filed by another firm, Gravitec, they state the thrust for their device is caused by the "Lorentz acceleration."
 
Last edited:
Top