Follow this plan to make inexpensive heat-grabbing solar collector fins for your solar collector.
Diagram displays the parts of a solar collector fin assembly.
ILLUSTRATION: MOTHER EARTH NEWS STAFF
PHOTO 1: Remove the ends and slice open a tin cylinder and trim the metal to size. PHOTO 2: Place the sheet between your fin shaper's cap and base and press. PHOTO 3: Pull out the grooved metal. PHOTO 4: Solder the finished fin to your copper collector pipe.