Doable Renewables: 16 Alternative Energy Projects for Young Scientists
When you cut tin cans you are left with sharp edges Based on my painful experience do not place your hand inside a tin can for any reason Drilling sawing cutting soldering sanding and painting all involve some risk ALWAYS WEAR PROTECTIVE GOG GLES Never look at concentrated sunlight If you don't know how to safely do something find knowledgeable help Take your time and don't work when you are tired or
SIMPLE HEAT ENGINE n this chapter you learn to create a device that will turn heat into motion MATERIALS AND TOOLS Corrugated cardboard Y inch thick Scissors Glue Sewing needle 18 inches long 4 rubber bands 7 inches long and 1 16 inch wide 60 watt incandescent desk lamp or heat source Aluminum foil optional Build It Cut one Rotor 1A three Base pieces 1B and four Sides 1C two with holes and two without refer to template The cut pieces along with the needle and rubber bands should look like the photo
IIIO The needle should be 15 inches long If your needle is a differ ent length adjust the width of the base The base should be 14 inch shorter than the length of the needle The rubber bands I used are 7 inches long cut apart and measured without stretch ing and 1 16 inch wide You can experiment with this but a band that is too strong or short may bend the needle But if the band is too loose it may not contract properly when heated Glue the three base pieces together in a stack The complete base assembly should appear as shown
Glue the side pieces together in two pairs Each pair should have one piece with a hole and one piece without a hole Flip one of the assemblies around so that one hole is on the left side while the other assembly has the hole on the right side H The completed side assemblies should appear as shown here Glue one side assembly to the base assembly as shown Note that the hole faces up toward the base
