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Recently, new neodymium magnets have become available as direct replacements for the old magets used in the tri-ang X04 motors. At £10 a peice, they are visibly much more powerful magnets than the ones they replace. In theory, they make the motors more powerful, efficient and effective at low speeds and mathematically, they should cause significant improvements.
In this video, I carry out a few experiments to see if these magnets really are an improvement on their predecessors