Preparing the Base and Supporting Beams
- Cut a piece of pink insulation
into a 10” x 10” square.
- Take 3 bamboo skewers and
tie a length of nylon string around from top to bottom, and back. Make sure blunt
ends are together and sharp ends are together.
- Repeat step 2, three more
times creating a total of 4 beams. (Note: These make the frame for the trebuchet)
- Mark off 1” from the
blunt end of each beam. This mark is the point of intersection where two beams
are tied together with the nylon, creating an angle.
- With a felt marker, mark off
an 8” x 8” square on the pink insulation.
- Stick each end of the beams
into a corner of the drawn square of the insulation.
- Duck tape 2 bamboo skewers
1.5” apart at the centre of the insulation, serving as a track for the ball to glide through.
Making the Arm
- Use a wooden paint stirrer
and attach a 4” x 2” x 1” Spruce wood to one end with a 2.5” screw.
- Using an electric drill, drill
a hole big enough to fit a chopstick in. (Note: The chopstick will act as a pivot point).
- Drill another hole closer
to the end of the arm. Push half a chopstick into the hole. (Note: This chopstick
will hold the counterweight).
- Bend a
paper clip and duck tape it to the other end of the arm.
- Stick a chopstick through
the other hole, creating a fulcrum.
- Place on top of the intersections
of the beams and add the counterweight.