Saturday, July 19, 2014
Gravity Light -- A Potential Power Source for QRP Ops in the Field
Nice idea.
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Alas, no. The basic physics says you'll get virtually nothing useful from the device, even assuming it's very efficient. The videos are (at best) misleading, and it's notable that they don't serve up even basic maths. Seethis blog entry, but the raw truth is you don't put much energy in when you raise a few rocks up through a metre or two, so you won't get much back. 73s, Rupert G6HVY
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