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Old 02-07-2008, 07:26 PM   #1 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,238

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,796
Thanked 6,656 Times in 3,448 Posts
Very clever knee brace generator - 5 watts while walking - no extra effort.

From the BBC: Knee dynamo taps 'people power'

This is really clever. The designers use a computer and potentiometer to determine when the lower leg is just about at the limit of extension (before the foot comes down), then it engages the generator to halt the extension - something your hamstring normally does.

So they've in effect made a generator that doesn't demand any extra effort on the part of the walker.

The inventors liken it to regenerative braking in hybrid cars: rather than "wasting" hamstring muscle power by "braking" the extending lower leg at the end of each step, the computer engages the generator and captures energy, which slows the leg extension and does some of the work of the hamstring.

There's a good video as well:

Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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