Recent photo of Shawyer standing next to table top EM Drive experiment:click here for HD picture with details:http://www.ibtimes.co.uk/emdrive-warp-drive-are-two-different-things-nasas-still-working-emdrive-1501268#slideshow/1436361
Speaking of safety, do glasses exist that are transparent to visible light and attenuate microwaves?How about clothing? - chain mail mebbe?
Quote from: Rodal on 05/15/2015 01:09 amRecent photo of Shawyer standing next to table top EM Drive experiment:click here for HD picture with details:http://www.ibtimes.co.uk/emdrive-warp-drive-are-two-different-things-nasas-still-working-emdrive-1501268#slideshow/1436361I see two feeds
Quote from: frobnicat on 05/14/2015 11:01 pmQuote from: TheTraveller on 05/13/2015 07:29 pmQuote from: Iulian Berca on 05/13/2015 07:07 pmToday i did the first test with the Emdrive (microwave oven magnetron and cooper frustum) The setup (magnetron and frusum) was suspended in a pendulum. I applied power for 40 Seconds with no visible thrust. Tomorrow will will try again with the magnetron on the small side. You have any suggestion for what should be the distance from the small side?After this i will adjust the power to the filament of magnetron and the frequency.To fine adjust the frequency i thought i can put 2 coils over the magnetron magnets to modify the magnetic field.My website;http://www.masinaelectrica.com/emdrive-independent-test/Well done.Nicely rolled cavity walls.Have you tried to calibrate your pendulum test rig by using a small spring scale to see how much force is needed to pull the cavity forward (toward the big end) say 1mm?Doing this will give you some info on how much force you will need to generate to see some movement.Maybe I should feel ashamed to propose the following calculation with all those heavy weight equations flying around, but since nobody is taking a bite at it :a hanging swing pendulum like that has, for small deviations, a linear dependency between force (thrust) F and displacement d F=(m*g/h)*d where h is length of strings and m the mass of test article and g local gravity. As a first guess, with m=2kg (or more like 5kg ?) and h=2m that's in the ballpark of 10mN/mm (milliNewton per millimetre) or 10µN/µm. Quite remarkably similar to Eagleworks balance apparent stiffness, making this mechanical setup basically as sensitive (displacement wrt thrust wise). If a linear displacement sensor of µm resolution were used it could probe into µN effects, provided proper casing to isolate from drafts and good damping where strings are suspended.Can you confirm : - weight of system 2kg, more ?- height of doorway, or rather length of strings about 2m ?- graduations marks spacing about 1cm ?The graduations marks on the video appear about 1cm apart, there is no obvious swing or displacement at power-on visible above, roughly eyeballing 1mm. That gives an upper order of magnitude bound for a thrust (if any) below 10mN/kW for this blazing fast experiment setup. Kudos, and stay safe.Would suggest 1gf / 10mN would be a really good result from this setup. Based on his published frustum height dimension of 228.6mm, Rf cavity resonance is 1.311GHz or 2.622GHz, which is a bit high for his magnetron. 244.7mm will give resonance at 2.45GHz. Assuming there are no fudge factors to be applied to parallel plate microwave resonance.
Quote from: TheTraveller on 05/13/2015 07:29 pmQuote from: Iulian Berca on 05/13/2015 07:07 pmToday i did the first test with the Emdrive (microwave oven magnetron and cooper frustum) The setup (magnetron and frusum) was suspended in a pendulum. I applied power for 40 Seconds with no visible thrust. Tomorrow will will try again with the magnetron on the small side. You have any suggestion for what should be the distance from the small side?After this i will adjust the power to the filament of magnetron and the frequency.To fine adjust the frequency i thought i can put 2 coils over the magnetron magnets to modify the magnetic field.My website;http://www.masinaelectrica.com/emdrive-independent-test/Well done.Nicely rolled cavity walls.Have you tried to calibrate your pendulum test rig by using a small spring scale to see how much force is needed to pull the cavity forward (toward the big end) say 1mm?Doing this will give you some info on how much force you will need to generate to see some movement.Maybe I should feel ashamed to propose the following calculation with all those heavy weight equations flying around, but since nobody is taking a bite at it :a hanging swing pendulum like that has, for small deviations, a linear dependency between force (thrust) F and displacement d F=(m*g/h)*d where h is length of strings and m the mass of test article and g local gravity. As a first guess, with m=2kg (or more like 5kg ?) and h=2m that's in the ballpark of 10mN/mm (milliNewton per millimetre) or 10µN/µm. Quite remarkably similar to Eagleworks balance apparent stiffness, making this mechanical setup basically as sensitive (displacement wrt thrust wise). If a linear displacement sensor of µm resolution were used it could probe into µN effects, provided proper casing to isolate from drafts and good damping where strings are suspended.Can you confirm : - weight of system 2kg, more ?- height of doorway, or rather length of strings about 2m ?- graduations marks spacing about 1cm ?The graduations marks on the video appear about 1cm apart, there is no obvious swing or displacement at power-on visible above, roughly eyeballing 1mm. That gives an upper order of magnitude bound for a thrust (if any) below 10mN/kW for this blazing fast experiment setup. Kudos, and stay safe.
Quote from: Iulian Berca on 05/13/2015 07:07 pmToday i did the first test with the Emdrive (microwave oven magnetron and cooper frustum) The setup (magnetron and frusum) was suspended in a pendulum. I applied power for 40 Seconds with no visible thrust. Tomorrow will will try again with the magnetron on the small side. You have any suggestion for what should be the distance from the small side?After this i will adjust the power to the filament of magnetron and the frequency.To fine adjust the frequency i thought i can put 2 coils over the magnetron magnets to modify the magnetic field.My website;http://www.masinaelectrica.com/emdrive-independent-test/Well done.Nicely rolled cavity walls.Have you tried to calibrate your pendulum test rig by using a small spring scale to see how much force is needed to pull the cavity forward (toward the big end) say 1mm?Doing this will give you some info on how much force you will need to generate to see some movement.
Today i did the first test with the Emdrive (microwave oven magnetron and cooper frustum) The setup (magnetron and frusum) was suspended in a pendulum. I applied power for 40 Seconds with no visible thrust. Tomorrow will will try again with the magnetron on the small side. You have any suggestion for what should be the distance from the small side?After this i will adjust the power to the filament of magnetron and the frequency.To fine adjust the frequency i thought i can put 2 coils over the magnetron magnets to modify the magnetic field.My website;http://www.masinaelectrica.com/emdrive-independent-test/
It looks like 3.5<something> GHz and I also see "FM". Hmm.I think LasJayhawk is right about the topmost cable being power sensing
Maybe 3.250 GHz. And the "FM" might simply be "AM"
Quote from: Rodal on 05/15/2015 01:09 amRecent photo of Shawyer standing next to table top EM Drive experiment:click here for HD picture with details:http://www.ibtimes.co.uk/emdrive-warp-drive-are-two-different-things-nasas-still-working-emdrive-1501268#slideshow/1436361The large blue cross shaped device with the humungous waveguide dummy load is a C band directional coupler. The type N connector on the rightmost arm would be connected with coax to more attenuators and then a power meter. Beneath it and obscured by the Agilent frequency generator is what looks like a C band waveguide switch, for directing the RF to the directional coupler or to the blue waveguide to BNC section with coax attached that is feeding the cavity. It's possible the device behind the Agilent signal generator may be the business end of a C band TWT but there isn't much room there so this might just be a staged photo-op.
An electronic balance isn't a terribly smart idea. But as has been said, this is probably a staged demo.