https://hackaday.io/project/5596-em-drive
Quote from: Rodal on 06/10/2015 07:54 pmhttps://hackaday.io/project/5596-em-driveI'm just looking at the plots. They say he decelerated from 500 spin units to 100 spin units 3000 time units sooner when he was thrusting against the spin as opposed to thrusting with the spin?
Quote from: Prunesquallor on 06/10/2015 08:00 pmQuote from: Rodal on 06/10/2015 07:54 pmhttps://hackaday.io/project/5596-em-driveI'm just looking at the plots. They say he decelerated from 500 spin units to 100 spin units 3000 time units sooner when he was thrusting against the spin as opposed to thrusting with the spin?That is my interpretation of the initial plots posted today. I'm looking forward to seeing more test runs and more plots.
First the Chinese lead in force/Input power (1 N/kW)Now the Germans lead in miniaturization (Baby EM Drive)If this works they already announced they were going to send it into Space...
First the Chinese lead in force/Input power (1 N/kW)Now the Germans lead in miniaturization (Baby EM Drive)...If this works they already announced they were going to send it into Space...
They need to take a lot more data. That includes repetitions and null tests and side-by-side comparisons and difference plots and statistical analyses and and...If finite thrust is found, the key parameters are N/W and N/Kg. It is likely that the latter one blows the doors off anything heretofore tried, due to the small dimensions.A composite Figure of Merit (FoM) might be better - i.e. N / (W Kg).Would make a good column for the Wiki?
Quote from: Rodal on 06/10/2015 08:37 pmFirst the Chinese lead in force/Input power (1 N/kW)Now the Germans lead in miniaturization (Baby EM Drive)...If this works they already announced they were going to send it into Space...I would hope they would attempt a null configuration test with a cylinder geometry test.
Quote from: SeeShells on 06/10/2015 07:17 pmQuote from: Rodal on 06/10/2015 06:55 pmQuote from: SeeShells on 06/10/2015 06:53 pm...It may seem like a question that has been asked before and tried to find it using the search function (right... good luck) but why 2.45 GHZ? Considering you can make a cavity in any size with a new set of harmonics at a different input frequency.Sorry to ask but I've tried to dig it out on my own and nadda.ShellBecause (2.45 GHz) that's the standard frequency for Magnetrons used in home microwave cooking ovens.The same reason why it was easy for Iulian to get a magnetron at that frequency at a reasonable price.And that's it? Thanks. I thought it might be it but I could never know if I missed something.Minor thing to remember is that when this cylinder is being submerged, your z-coordinate, if measured from the water level, is not a constant. When the cylinder goes down some incremental step dz, it will actually raise the water level in your container by:dwaterlevel= (A*dz)/AreaGarbageCan)The changing of the water level will mean more of your cylinder is submerged that just a simple calculation would indicate, which is something you need to include into the math. Easy to do the iterative calculation. There is also a closed form solution if you are into that sort of thing . You can see just from the above equation that one way to eliminate this issue is to choose a large area container, so the change in water height becomes negligible.
Quote from: Rodal on 06/10/2015 06:55 pmQuote from: SeeShells on 06/10/2015 06:53 pm...It may seem like a question that has been asked before and tried to find it using the search function (right... good luck) but why 2.45 GHZ? Considering you can make a cavity in any size with a new set of harmonics at a different input frequency.Sorry to ask but I've tried to dig it out on my own and nadda.ShellBecause (2.45 GHz) that's the standard frequency for Magnetrons used in home microwave cooking ovens.The same reason why it was easy for Iulian to get a magnetron at that frequency at a reasonable price.And that's it? Thanks. I thought it might be it but I could never know if I missed something.
Quote from: SeeShells on 06/10/2015 06:53 pm...It may seem like a question that has been asked before and tried to find it using the search function (right... good luck) but why 2.45 GHZ? Considering you can make a cavity in any size with a new set of harmonics at a different input frequency.Sorry to ask but I've tried to dig it out on my own and nadda.ShellBecause (2.45 GHz) that's the standard frequency for Magnetrons used in home microwave cooking ovens.The same reason why it was easy for Iulian to get a magnetron at that frequency at a reasonable price.
...It may seem like a question that has been asked before and tried to find it using the search function (right... good luck) but why 2.45 GHZ? Considering you can make a cavity in any size with a new set of harmonics at a different input frequency.Sorry to ask but I've tried to dig it out on my own and nadda.Shell