Gravity modification by high-temperature superconductors (null replication)
C. Woods · J. Helme · S. Cooke · C. Caldwell
Summary and citation · read the original at the source
In one page
Clive Woods and his Sheffield colleagues J. Helme, S. Cooke and C. Caldwell set out to test one of the boldest claims in gravity research: Eugene Podkletnov’s report that a levitated, spinning, high-temperature superconducting disc reduces the weight of anything held above it. They built the hardware, ran the measurement with discs up to three inches across, and found no change in the weight of the test mass. What makes the paper worth reading is its honesty about scope. The team say plainly that their tests did not fulfil all the specified conditions for a gravity effect — the internal structure of the disc, and the levitating and rotating system, both fell short of what the original description calls for — so what they publish is a bound, not a verdict. Their effort went into reproducing the ceramic disc itself, the source component, and they did not reach the field-effect stage. The apparatus and the sensitivity limits are on the record, which is what makes a null result useful to everyone who comes after.
Why it matters hereChapter 11 needs a published number for how large a gravity-shielding effect would have to be to have escaped detection so far, and this is where that number comes from; chapter 1 uses the same paper as its model of a null result that constrains a claim honestly instead of dismissing it.
What it claims
01An independent team, working outside the original laboratory, built and ran the Podkletnov gravity-modification configuration with high-temperature superconducting discs of up to three inches diameter and detected no change in the weight of the test mass.AIAA 2001-3363, 37th Joint Propulsion Conference, Salt Lake City, July 2001
Published and peer-reviewed02The authors state that their tests had not fulfilled the specified conditions for a gravity effect, naming in particular conditions on the material structure of the disc and on the levitating and rotating system.AIAA 2001-3363, results and discussion
Published and peer-reviewed03Their effort was directed at reproducing the ceramic disc — the source component of the claimed effect — and did not reach the field-effect components of the original configuration.AIAA 2001-3363, apparatus section
Published and peer-reviewed04The paper publishes its apparatus and its sensitivity limits, so the result functions as a quantitative upper bound on any effect of this kind rather than as an opinion about the claim.AIAA 2001-3363, experimental sensitivity
Published and peer-reviewed05Because the specified conditions were not all met, the question the paper leaves open is a specific one: a run that meets them — the bi-layer disc structure, levitation and rotation as described, and the electromagnetic power input into the superconductor — is the measurement that would settle whether the reported effect exists.AIAA 2001-3363, conclusions; context in Gallerati 2022, Section 2.1.1
What to watch
The way in
https://arc.aiaa.org/doi/10.2514/6.2001-3363An AIAA conference paper held closed-access by the publisher; Unpaywall and Semantic Scholar both report no open version and the publisher suppresses even the abstract, so this page carries a summary written from the Crossref record, the site’s own chapter-11 dossier and the peer-reviewed 2022 Gallerati review that describes the experiment. The author list here is the Crossref list, which corrects an earlier mis-parse.
How to cite it
C. Woods, J. Helme, S. Cooke, C. Caldwell (2001) Gravity modification by high-temperature superconductors (null replication). doi:10.2514/6.2001-3363
Where it sits in the curriculum