Doable Renewables: 16 Alternative Energy Projects for Young Scientists
By Mike Rigsby
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Book preview
Doable Renewables - Mike Rigsby
stressed.
1
SIMPLE HEAT ENGINE
In this chapter you learn to create a device that will turn heat into motion.
MATERIALS AND TOOLS
Corrugated cardboard, ⅛ inch thick
Scissors
Glue
Sewing needle, 1⅝ 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 here.
The needle should be 1⅝ inches long. If your needle is a different length, adjust the width of the base. The base should be ¼ inch shorter than the length of the needle. The rubber bands I used are 7 inches long (cut apart and measured without stretching) 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 here.
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.
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 piece.
After the glue is dry from the previous step, glue the other side assembly to the base with the holes facing each other.
Now use the rubber bands to suspend the needle in the center of the rotor. One at a time, wrap the four rubber bands around the rotor and loop them over the needle as follows: place one end of a rubber band over an end of the needle, bring the rubber band around the rotor and loop the other end of the rubber band over the opposite end of the needle. Repeat this with the remaining three rubber bands, forming an X, as shown