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<t>Here is a simple/stupid idea I am toying with for this summer.<br/> <br/> I will cut out a half a parabola on a plywood template, 2-3 feet long and attach it to a metal rod as the Y axis. Go to the nearest [beach|sandbox], stick the rod in the sand and turn the template to make a parabola in sand...

<t>Here is a simple/stupid idea I am toying with for this summer.<br/> <br/> I will cut out a half a parabola on a plywood template, 2-3 feet long and attach it to a metal rod as the Y axis. Go to the nearest [beach|sandbox], stick the rod in the sand and turn the template to make a parabola in sand...