Jan Przysiezniak

Pedal-Powered Mulcher: Gang Ride

Pedal-powered mulcher: briefly, the chop unit.

Pedal-powered mulcher: the pedal drive

Pedal-powered mulcher: field test and progress report

Pedal-powered mulcher: the chopping mechanism

Pedal-powering a household electric wood chipper

Pedal-powered generator on upside-down bike: it blows!

Installing a replacement rail on a fancy bike saddle

Recumbent seat from bicycle parts

Bicycle for an armless person

Fabricating Shimano "Deerhead" gear-shifter clamps on a mini-lathe