This is a full sized solar cooker that can be disassembled and folded to fit in your back pocket, then reassembled and cooked in.
I used some old poster board squares that had foil on them already. The panels are 14" - 35.36cm squares and the base is 8" - 20.32cm square.
I will show how I finished and folded it.
Here you see it folded in the pocket, ready to assemble and assembled to cook.
I will also show how to make one from two sheets of poster paper.
Step 1: Folding the Panels and Base
1 Lay out the 4 large panels and the base
2 Fold each panel in half. Also fold base in half.
3 Then fold each half panel in half again making fourths. Don't fold base in half again.
4 Fold panels again to checkbook size.
Step 2: Pocket Solar Cooker Full Size
I found 4 old poster paper pieces with foil and used them to make a pocket solar cooker. The 4 old poster pieces are 14" or 35.56cm squares. The two base pieces measured 8" or 20.32cm squares.
Step 3: Finishing the Reflective Panels
1 Tape around the panel to keep the foil from tearing. Then round the corners and punch 1 corner.
2 Use 17 hole template to mark holes. Use awl or punch to make holes.
3 Put the 2 base pieces together with pipe cleaners to form the pockets in a large X. Then use a separate pipe cleaner to hold the punched corners at the center holes.
4 Slide punched corners of panels in base pockets. Line up holes and thread pipe cleaner through all four to hold panels in base.
Step 4: Materials to Make the Solar Cooker.
2 sheets of poster paper 22" x 28" or 55.88cm x 71.12cm
1 roll aluminum foil
1 bottle school glue
1 roll tape
4 office clips
3 pipe cleaners - ribbon or yarn or shoelace can be used
Step 5: Tools to Make Solar Cooker.
1 pair scissors or 1 box cutter
1 glue spreader
1 hole punch
1 punch 17 nails* or
1 template with 17 holes**
* We made this wooden punch with nails for me to use in classes. I will make plans available later.
*I will make the template available later.
To make your own template:
a.Draw an X from corner to corner of 8" or 20.32cm square
b. From center of X punch holes every 1.5" or 3.81cm toward each corner
c. Punch holes for holding corners of panels out 1/2" or 1.27cm from center toward sides of the base piece
Step 6: How to Cut and Fold the Base Pieces
1 Line up both sheets and use small piece of tape to hold together
2 Measure 8 " or from long side of poster paper and cut off
3 Divide remaining piece in half to make the 14" or squares
4 Line up the corners of the 8" or strips to draw lines at 8" on both sides
5 Move strips to cross at the line and mark both sides
6 Fold on lines making 2 separate squares
7 Cut off remainder pieces and tape them together to make a square and fold foil on the square.
Step 7: Put Foil on Panels
1 Have all 4 panels ready.
2 Squeeze glue onto panel.
3 Spread glue evenly
4 Lay foil carefully from one edge and hand smooth
5 After all 4 panels are foiled lay them out to see how much more foil is needed.
6 Use another piece of foil to make strips to finish panels
7 Fold foil a little larger than needed
8 Use a credit card to cut the strips or scissors
9 Trim edges with credit card or scissors
10 Tape around edges to keep foil from tearing
Step 8: Optional : Glue Fabric to Back of Panels for Extra Durability.
1 Cut squares of fabric to fit the poster paper panels see examples
2 Glue or use iron on adhesive to cover back of panels
3 Tape edges as before to keep edge smooth for easy adjustment of panels
4 To keep fabric clean spray with clear acrylic sealer