rfmwguy

I think this episode sets the standard for moving forward with experimentation with an open, yet skeptical mind. Its hard to argue against further testing as a displacement force was noted in many experiments. Whether that was in the noise, a mundane effect or something undiscovered certainly justifies further efforts considering the potential. Pretty logical conclusion from this episode.

https://www.reddit.com/r/EmDrive/comments/5jboig/microsoft_bing_offers_a_slight_better_translation/ And https://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fdigitalpaper.stdaily.com%2Fhttp_www.kjrb.com%2Fkjrb%2Fhtml%2F2016-12%2F11%2Fcontent_357004.htm

Nothing I could point to as an answer. H fields were stable, same with E fields. Did not get the chance to monitor Cu++ at the time. Still debate whether it's particle or wave or something else entirely. Planck theories are interesting but remain suspect. All I ruled out was thermal air movement, or lift when I went from teeter totter to Cavendish torsion beam. Displacement was too rapid for center of gravity change due to heating. 1/8 in copper cavity absorbs and radiates heat very slowly.

Higher frequencies can reduce size but power output and stability can be a factor. No one is certain about what the sub 1ghz drives might do but mass would definitely increase. 25 GHz is highest so far. When it becomes accepted technology as I think it will be there should be a broad spectrum of experimentation.

Tajmar is overseeing testing at his lab. Everything you mentioned is valid except bigger chamber. Chamber size is based upon frequency used. A bigger chamber would mean a much lower frequency. That has not been experimented with yet to my knowledge, only higher/smaller.

Kocyla emdrive testing: https://hackaday.io/project/5596-em-drive/log/48016-emdrive-goes-for-serious-testing

Paul is reworking heatsink his output chip. Don't know all the details but think it went over temp in vacuum. No airflow = higher temp. Sorry, that's all I know. No, this homeboy doesn't have access to a chamber yet. Thermals are vertical on all surfaces, so torsion beam would try and lift. Guy wires per video make lifting beam difficult and would not register on Lds. Sealed RF injection point to prevent jetting. Ballooning on teeter totter was significant. Force measured was opposite lift of about 177 microN. Basically it reversed, stalled or attenuated lift. That was a wire screen frustum at much lower Q. Regardless, saw the effect first with teeter totter setup. His first vacuum test was done by Dr Tajmar at at Univ of dresden

I am speaking from memory, not the data itself, but the torsion beam was about 107 inches in total length, the LDS measured displacement in millivolts that I calibrated directly with calibrated weights. IIRC, the displacement of the beam was less than about 5-6 mm. Liquid cooling adds an error component, moving fluids and impellers. This thing has to be totally vibration-free to be accurate.

No idea. 1701 was tested on a teeter-totter and thermal lift is the heated air around the unit causing it to lift up. A small amount of thrust with the original design was measured @ 177 microNewtons. !701A was a torsion beam and thermal lift was not a factor as the twist was in the horizontal plane. 1701A was a new, solid copper cavity and measured 18.4 mN best. Beam displacement made by precision Laser Displacement Sensor with micrometer accuracy. Pulsing was more of a thermal management issue as the Magnetron heats up to 400F pretty rapidly.

NASA/Eagleworks EmDrive full disclosure just occured: https://www.reddit.com/r/EmDrive/comments/5b9zfh/emdrive_data/

Thrust was tested on a torsion beam. I have about 40 vids on youtube, this one was a test stand walkaround:

Understood. EmDrive topics on other forums have the same issue at times. I'll do my best to focus on legitimate questions and not on disruptive comments.

My friend Paul Kpycla is building a picosat EmDrive here: https://hackaday.io/project/5596-em-drive Mine exceeds the 10 cm form factor and would not be suitable for cubesats. Basically, I had 750W RF producing 18.4 mN.

Seems an older thread was locked down after I offered to answer legitimate questions on EmDrives as I understand them. Not sure if this is a verboten topic here or wise-guys abuse the topic, but for those honestly interested in what I know about it, my design, build and testing of 2 engineering models, fire your questions here...unless the powers to be want the topic to be excluded.

I am one of the handful of random guys. Feel free to ask me a question while I happen to be posting here.