Its been many years since I studied this myself, but I think Forward generally gets credit for the drive concept because he noted the backward inertial contribution first. OTOH, I do recall it being called a "Bondi propeller" as well, so who gets credit for it I'm not certain. Woodward mentions this in his book but doesn't take sides. He just notes that indeed, even physicists neglect the fact the negative inertia reverses the reversed gravity and makes negative mass fall toward rather than away from positive mass.
Quote from: JasonAW3 on 10/03/2014 01:53 pmIn the case as presented, it sort of appears that the electron stream, may be being concentrated and accelerated to increse their effective mass.They are not claiming that mass, regardless of its elemental particle composition, including electrons, is coming out of the device.
In the case as presented, it sort of appears that the electron stream, may be being concentrated and accelerated to increse their effective mass.
Quote from: JohnFornaro on 10/03/2014 02:20 pmQuote from: JasonAW3 on 10/03/2014 01:53 pmIn the case as presented, it sort of appears that the electron stream, may be being concentrated and accelerated to increse their effective mass.They are not claiming that mass, regardless of its elemental particle composition, including electrons, is coming out of the device.Ok,As far as I can tell then, it simply shouldn't work.If you're using RF frequencies, then they are transmitting an electron stream, but where is the stream going? Unless they have figured out some way of converting electrons into kenitic energy, I can't with any conventional physics, see how this could work.
http://arxiv.org/abs/1302.2775This paper is compelling in my view. It is written from the point of view of spherical shapes so keep that in mind if you read this. At the conclusion factor in the conical shape of the emdrive and remember the stuff I posted earlier concerning casimir energies and 3d shapes and cavities. Spheres attract externally but repulse internally across a diameter. Cones do the same but scatter because of their asymmetry, causing an imbalance.
Quote from: Rodal on 10/03/2014 11:15 pmScheme for Detecting Unruth Radiation (Stanford)Easier to just accelerate a thermometer.
Scheme for Detecting Unruth Radiation (Stanford)
Quote from: Mulletron on 10/03/2014 11:31 pmQuote from: Rodal on 10/03/2014 11:15 pmScheme for Detecting Unruth Radiation (Stanford)Easier to just accelerate a thermometer.You are going to need an extremely high acceleration:2.5 × 10^20 m/s^2 corresponds to a temperature of 1 Kfor comparison, the Space Shuttle acceleration was only 29 m/s^2 and/or an extremely precise thermometer....
Quote from: Rodal on 10/03/2014 11:40 pmQuote from: Mulletron on 10/03/2014 11:31 pmQuote from: Rodal on 10/03/2014 11:15 pmScheme for Detecting Unruth Radiation (Stanford)Easier to just accelerate a thermometer.You are going to need an extremely high acceleration:2.5 × 10^20 m/s^2 corresponds to a temperature of 1 Kfor comparison, the Space Shuttle acceleration was only 29 m/s^2 and/or an extremely precise thermometer....I agree. Thanks for the math.
Quote from: Mulletron on 10/03/2014 11:31 pmQuote from: Rodal on 10/03/2014 11:15 pmScheme for Detecting Unruth Radiation (Stanford)Easier to just accelerate a thermometer.You are going to need an extremely high acceleration:2.5 × 10^20 m/s^2 corresponds to a temperature of 1 Kfor comparison, the Space Shuttle acceleration was only 29 m/s^2 and/or an extremely precise thermometer....with the most precise thermometer you may be able to measure to a precision of ~10 X 10^(-9) of a degree K.
For two positive masses, nothing changes and there is a pull on each other causing an attraction. Two negative masses would produce a pull on one another, but would repel because of their negative inertial masses. For different signs there is a push that repels the positive mass but attracts the negative mass.Bondi pointed out that two objects of equal and opposite mass would produce a constant acceleration of the system towards the positive-mass object.[citation needed] However, the total mass, momentum and energy of the system would remain 0.This behavior is completely inconsistent with a common-sense approach and the expected behaviour of 'normal' matter; but is completely mathematically consistent and introduces no violation of conservation of momentum or energy. If the masses are equal in magnitude but opposite in sign, then the momentum of the system remains zero if they both travel together and accelerate together, no matter what their speed:And equivalently for the kinetic energy :Forward extended Bondi's analysis to additional cases, and showed that even if the two masses m(-) and m(+) are not the same, the conservation laws remain unbroken. This is true even when relativistic effects are considered, so long as inertial mass, not rest mass, is equal to gravitational mass.This behaviour can produce bizarre results: for instance, a gas containing a mixture of positive and negative matter particles will have the positive matter portion increase in temperature without bound. However, the negative matter portion gains negative temperature at the same rate, again balancing out. Geoffrey A. Landis pointed out other implications of Forward's analysis,[2] including noting that although negative mass particles would repel each other gravitationally, the electrostatic force would be attractive for like-charges and repulsive for opposite charges.Forward used the properties of negative-mass matter to create the diametric drive, a design for spacecraft propulsion using negative mass that requires no energy input and no reaction mass to achieve arbitrarily high acceleration.
...Getting unlimited energy source by just radiating away tons of negative mass as debt never to be paid. This is brilliant ! That should easily find some financial backer.
Getting unlimited energy source by just radiating away tons of negative mass as debt never to be paid. This is brilliant ! That should easily find some financial backer.