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The spiral reel lawnmowers ("Leave it to Beaver" type) are and quiet economical but a pain in the butt to use.
I plan to affix bicycle pedals and a flywheel to it. I could then plop on one of my children to power it.
I mow until the child gets tired and throw on a fresh one.
An additional benefit
is that it tuckers out the kid so they nap.
Halfbakery: Kiddie Mower
Similar approach, but pushed, not cycled. [jutta, Feb 14 2008]
||A big "hamster wheel" would be better. Attach a generator to the axle, then you can split the power between cutting and propulsion.