- 1 flat wooden base (37.5cm x 13.5cm x 1.4cm)
- 2 columns of wood (3.8cm x 3.8xm x 46.0cm)
- 2 blocks of wood (10.4cm x 3.8cm x 5.0cm)
- 1 piece of wood (6.8cm x 21.0cm x 3.8cm)
- 1 lightweight, flat wood piece (29.0cm x 8.0cm)
- 1 rigid cylindrical wood piece (17.0cm in length, ~0.5cm in diameter)
- 6 elastic bands (5.0cm in diameter)
- 1 medium sized elastic band (exact size doesn't matter)
- 2 small sized elastic bands (exact size doesn't matter)
- 3 3" nails (7.6cm)
- 3 2"nails (5.1cm)
- 4 1" nails (2.5cm)
- 4 1" screw-eyes (2.5cm in diameter)
- 2 U-type nails
- 3 spherical projectiles (see Status Update for specific measurements)
Structural Drawing
Figure 2.1: Structural Drawing (angle: front)
Figure 2.2: Structural Drawing (angle: top)
Figure 2.3: Structural Drawing 3 (angle: side)
Changes to Design
Figure 2.1: Structural Drawing (angle: front)
Figure 2.2: Structural Drawing (angle: top)
Figure 2.3: Structural Drawing 3 (angle: side)
Changes to Design
- Instead of creating a linking piece across the top of the two column's and attaching the elastic to the catapult arm from there, elastics were attached to the rotating piece from the front face of each pillar. By creating two points of attachment, double the elastic potential energy can be harnessed, and their symmetry will spread out the tension. To avoid the arm from going over 0 degrees (completely vertical), and releasing the projectile towards the ground, an elastic band will be stretched across the two columns.
