|
Size: 890
Comment:
|
Size: 1872
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 11: | Line 11: |
| || {{ attachment:device1.jpg | | width=450 }} || {{ attachment:device2.jpg | | width=450 }} || || 28 watts, diameter 11 inches ~= 14 cm radius || 40 watts || |
|| '''Device 1''' || '''Device 2''' || || {{ attachment:device1.jpg | | width=450 }} || {{ attachment:device2.jpg | | width=450 }} || || 28 watts, diameter 11 inches ~= 14 cm radius || 40 watts, estimated diameter 12 inches || || Estimated area 0.123 m^2^, 230 W/m² || Distribution of heat uncertain, || || Shiny, estimated emissivity 0.1 || Temperature probably similar || || 230 = 0.1 * 4.567e-8 * ( T⁴ - (300K)⁴ ) || || ⇒ T = 492K ≈ 220° C || Note that Device 1 is anchored to the microwave source on the right; some heat will flow out the right side, so it will be colder than the left side. Here is a [[ https://en.wikipedia.org/wiki/Crookes_radiometer | Crooke's radiometer ]], AKA a light mill, another device with slightly more heat on one side than the other: || {{ attachment:Crookes_radiometer.jpg | | height=400 }} || Here is a [[ https://en.wikipedia.org/wiki/Crookes_radiometer | Crooke's radiometer ]], AKA a light mill, another device with slightly more heat on one side than the other || |
Anomalous Thrust
Fringe space fans flock to dodgy research; learning physics and engineering in order to exploit the wonders of proven scientific phenomena is too much like work, I suppose.
One bit of dodgy research is "quantum vacuum plasma thrusters", promulgated by Harold White's group at NASA's Johnson Space Center. There may be spooky new effects here, but their experiments are not nearly detailed or careful enough to actually measure them while ruling out more likely phenomena.
A paper here: Anomalous Thrust Production from an RF Test Device Measured on a Low-Thrust Torsion Pendulum
Their test devices are shown here:
Device 1 |
Device 2 |
|
|
28 watts, diameter 11 inches ~= 14 cm radius |
40 watts, estimated diameter 12 inches |
Estimated area 0.123 m2, 230 W/m² |
Distribution of heat uncertain, |
Shiny, estimated emissivity 0.1 |
Temperature probably similar |
230 = 0.1 * 4.567e-8 * ( T⁴ - (300K)⁴ ) |
|
⇒ T = 492K ≈ 220° C |
Note that Device 1 is anchored to the microwave source on the right; some heat will flow out the right side, so it will be colder than the left side.
Here is a Crooke's radiometer, AKA a light mill, another device with slightly more heat on one side than the other:
|
Here is a Crooke's radiometer, AKA a light mill, another device with slightly more heat on one side than the other |
