Cut off the top off an aluminum can.

1
Pop Pop Boiler Construction
Warning Be very careful not to cut yourself on
the sharp edges of the can

• Cut off the top off an aluminum can.

Exploration
2
Pop Pop Boiler Construction

• Cut down the middle of the can then cut off the
  bottom
• Trim the jagged edges off

Exploration
3
Pop Pop Boiler Construction

• Bend the can in half
• Put a piece of tape along the open end
• Use a ruler to help crease the bend edge

Exploration
4
Pop Pop Boiler Construction

• Tape the Boiler pattern to one side of the can
• Cut along the solid lines

Exploration
5
Pop Pop Boiler Construction

• Fold the edges of the can along the dashed lines.

Exploration
6
Pop Pop Boiler Construction

• Carefully open one end
• do not worry if one side is rounded or flat yet
• that will come later
• Slide two bendy straws
• long side into the pocket.

Exploration
7
Pop Pop Boiler Construction

• Now take a third bendy straw and carefully slide
  it on top of the other two straws
• Short bendy side in this time

Exploration
8
Pop Pop Boiler Construction

• Tape this assembly to a stiff piece of cardboard

Exploration
9
Pop Pop Boiler Construction

• Carefully press the edges down
• This will make one side flat and the other side
  bent

Exploration
10
Pop Pop Boiler Construction

• We will mix some Epoxy glue to glue the edges
  down.
• Make sure that you cover the entire edges
• Set aside to cure until next class

For homework construct the Bend Pattern
Exploration
11
Pop Pop Boiler Construction

• Pull out the straws and cut the short bendy side
  to a length of 1 ½

Exploration
12
Pop Pop Boiler Construction

• Put an even coat of Epoxy around the short end of
  the bendy straw.
• Keep glue at least ¼ away from the bendy part

Exploration
13
Pop Pop Boiler Construction

• Slide the straws back into the boiler.
• Make sure that NO glue gets on the bendy part.
• Have the bendy part stick out about ¼
• Carefully use leftover Epoxy to seal the end of
  the boiler

Exploration
14
Pop Pop Boiler Construction

• Pressure test your boiler
• Put into a cup of water and blow hard on the
  straws.
• If you see any bubbles, you must seal them with
  more Epoxy

Exploration
15
Pop Pop Boiler Construction

• Use the Bend Pattern to bend the straws to the
  desired angle
• Make sure that the flaps are pointing outward
• Tape in place

Exploration
16
Pop Pop Boiler Construction

• Caution If there are any kinks in the bend, your
  boiler will not work and you will have to start
  over.

• Hot glue the bendy shape.

Exploration
17
Pop Pop Boiler Construction

• Trim the straw 4 inches away from the bend

Exploration
18
Pop Pop Boiler Construction

• Prime the motor and test your boiler
• If you do not hear a pop pop sound you will
  need to start over.

Exploration
19
Did you know

• The history of the steam engine stretches back as
  far as the first century AD
• The first recorded steam engine was the aeolipile
  described by Greek mathematician Hero of
  Alexandria

Explanation
20
Did you know

• A pop pop boat is powered by a very simple heat
  engine consisting of a small boiler connected to
  an exhaust tube.
• When heat is applied to the boiler, water in the
  boiler flashes into steam.
• The expanding steam pushes some of the water in
  the exhaust tube, propelling the boat forward.
• The steam bubble then condenses, creating a
  vacuum which draws water back in through the
  exhaust tube.

Explanation