Quote from: SleeperService on 02/14/2015 11:51 pmI'm thinking an xU cubesat with a big battery. Spin stabilized even at 50 micro newtons we would see positive results within an hour, tracked from the ground.I hoped to be experimental about this.Experiment trumps theory every time.With what we have, lets have an experiment in zero-g
I'm thinking an xU cubesat with a big battery. Spin stabilized even at 50 micro newtons we would see positive results within an hour, tracked from the ground.
Someone have a word with Elon.... He must know a thing or two... The Cannae stuff seems like a scam...
Cool. Elon should be all over this then...
Given that thrust follows the dielectric and can be controlled at will; it is clear that this is no artifact.
Elon should employ Rodal, Mullertron, NotSureOfIt et al to examine anomalous thrust.To not do so would be bad business.
@elonmuskIf u saw @TheSimpsons and wonder why @SpaceX doesn't use an electric rocket to reach orbit, it is cuz that is impossible
The fact that it has reverse too pretty much clinches it. That speaks volumes.
Folks:In the meantime, lets ask why 60 watts of relatively harmonic free sine-wave RF power at the 1,937.118 MHz AKA the TM212 resonant frequency in this copper frustum cavity, can only generate a paltry ~60uN, whereas the Chinese claimed to have produce 160,000uN using just ~150 watts of 2,450 MHz RF signals from a magnetron? The magnetron RF signal source that is anything but a pure sine-wave generator, that instead has a modulated FM bandwidth of at least +/-30 MHz that is also concurrently amplitude modulated (AM) with thermal electron noise.
Quote from: Star-Drive on 02/15/2015 04:17 amFolks:In the meantime, lets ask why 60 watts of relatively harmonic free sine-wave RF power at the 1,937.118 MHz AKA the TM212 resonant frequency in this copper frustum cavity, can only generate a paltry ~60uN, whereas the Chinese claimed to have produce 160,000uN using just ~150 watts of 2,450 MHz RF signals from a magnetron? The magnetron RF signal source that is anything but a pure sine-wave generator, that instead has a modulated FM bandwidth of at least +/-30 MHz that is also concurrently amplitude modulated (AM) with thermal electron noise. Taking a critical look at this question, and knowing that the spectral shape of a magnetron looks like (see below) compared to a CW spike. It seems evident that a CW spike isn't the best waveform to use if you want to maximize thrust. Dollars to donuts says the Chinese are making full use of the available bandwidth of their resonant cavity by using that noisy magnetron. Magnetrons have lots of phase noise too. You can't easily use them on phased array radars because of that for example. ...
the resonant frequency and quality factor of the independent microwave resonator system are 2.44895 GHz and 117495.08 respectively
Prior to the TM211 evaluations, COMSOL® analysis indicated that the TE012 was an effective thrust generation mode for the tapered cavity thruster being evaluated, so this mode was explored early in the evaluation process. Figure 22 shows a test run at the TE012 mode with an operating frequency of 1880.4 MHz. The measured quality factor was ~22,000, with a COMSOL prediction of 21,817. The measured power applied to the test article was measured to be 2.6 watts, and the (net) measured thrust was 55.4 micronewtons. With an input power of 2.6 watts, correcting for the quality factor, the predicted thrust is 50 micronewtons. However, since the TE012 mode had numerous other RF modes in very close proximity, it was impractical to repeatedly operate the system in this mode, so the decision was made to evaluate the TM211 modes instead.
AbstractA microwave resonator system is made, which has a tapered resonant cavity, a microwave source, and a transmission device. Because of the electromagnetic pressure gradient on the tapered resonant cavity, a net electromagnetic force along the axis of the cavity may be observed, which is needed to verify experimentally the use of the independent microwave resonator system. It is also needed to keep the independent microwave resonator system in resonating state, which is the important procedure to demonstrate the possibility of net electromagnetic force. Thus, a low-signal resonating experiment on the tapered resonant cavity combined with resonating parts is completed to accurately find out the resonant frequency of 2.45 GHz and to analyze the influence of temperature on the resonant state. Experimental result shows that the resonant frequency and quality factor of the independent microwave resonator system are 2.44895 GHz and 117495.08 respectively. When the temperature of the tapered resonant cavity wall rises, the resonant frequency will be decreased and the quality factor changed separately.
"the electromagnetic field intensity calculated in the vicinity of the axis is larger, therefore the center of the small end has a higher thermal energy, thus heating quickly," ...."we measured the cavity surface surface temperature at different locations as shown in Figure 11 with a thermocouple. [Fig. 11, which I attach below shows the positions of the thermocouples noted as "1" to "6"] Temperature measurements at different points vs. time, are shown in FIG 12 [Fig 12 which I attach below shows the temperature vs time at the 6 different thermocouple locations]. The temperature at the center of small end [thermocouple #1] first began rising rapidly."