List of Suggested Experiments
This page compiles suggestions for as-yet untested variations in experiment designs for EmDrive testing. When possible, links to the original suggestion and a brief description of the justification for this test are provided.
Note: For purposes of this list, the baseline for experimentation is considered to be a copper fustrum with either a magnetron or coaxial RF feed operated at approximately 2.45Ghz, similar to Shawyer's Feasability Study
- Replace solid endplates with a circular grid design similar to the endplates used by Cullen in his 1950's waveguide experiments, or a mesh as the one used for the glass windows in home-microwave-ovens, having a spacing between mesh or grids small enough such that only wavelengths smaller than that can get through. Purpose: to allow convection through the fustrum, eliminate buoyancy, thermal jet effects, natural thermal convection currents, and other gas effects.
- Place ferrite beads in the fustrum, either one large one next to an endplate or a pattern of them along a line in the longitudinal direction. Purpose: to increase attenuation gradient in TE modes, having an axial magnetic field.
- Build Large end plate out of Metglas or a similar material with high magnetic permeability like cast iron or any ferrite. Purpose: to test de Aquino's conjecture regarding the effect of power dissipation at the end faces of the truncated cone.
- Place a ruby inside near one of the ends to emit at 2.4 GHz as used in solid state Masers.
- Fill the fustrum with ammonia gas to emit at 24GHz. Purpose: To produce maser-like amplification inside the fustrum.
- Place a dielectric next to the Small end, as done by NASA Eagleworks, who found extruded HDPE to be slightly better than extruded PTFE. Do not use molded (instead of extruded) polymers. NASA Eagleworks found that Neoprene rubber performed poorly as a dielectric in the EM Drive, as it resulted in considerably less thrust.
- Separate resonance and attenuation chambers (proposed by WarpTech)
- Apply a silver or gold coating to the inside of a copper fustrum. Purpose: The increase microwave reflectivity, and therefore increase Q factor.
- Fill the cavity with water. Purpose: Predicted to result in greater thrust by Mike McCulloch's MiHsC Theory [And precisely in what reference does McCulloch ever claim that filling the cavity with water will produce greater thrust? McCulloch's published paper does not ever mention filling the cavity with water. A google search reveals this was brought up by an anonymous poster in his blog, and McCulloch ignored his mention of water. Can you please provide a link ?, otherwise this is a dangerous unsafe suggestion as it is well known that water (a very dipolar molecule) is going to rapidly heat and boil and increase pressure inside the cavity under the microwaves]
Experimental Measurement Setups
- Use smokesticks to test for out-gassing and hot air jets from the fustrum
- Test on a zero-g simulator flight.
- Cavendish Pendulum
- Forum post by Rodal
- Forum post by demofsky
- Forum post by Rodal summarizing several prior posts.
- Forum post by Flyby referencing earlier posts.
- Forum post by aero, in response to Rodal's explanation of the history of maser development.
- Credit to @Seeshells