Day 5

Modifications

• Replaced strings holding counter weight can with 5.25 in. metal bars.
• Shortened bolts on base that hold the pin (so the trebuchet can sit flat).
• Trimmed base PVC pipe that holds pin bolts.

Test 1

• Sling released too soon
• Balloon went backwards

Test 2

• Reset.
• Same results.

Test 3

• Reset.
• Same results.

Test 4

• Used larger balloon.
• Sling released too soon.
• Balloon went backwards, popped.

Test 5

• Added v-shaped metal track.
• Success! Balloon hit wall on opposite side of balcony (appx. 15 m) before bouncing away.

Test 6

• Used balloon with thinner rubber.
• Same results as above. Balloon popped.
• Traveled 15.27 m.
• Was launched at slight angle to the right of the trebuchet. Possibly caused by misaligned track.

Conclusion: Adding the v-shaped metal track greatly improved the performance of the trebuchet. What to try next time:

• Properly align the track.
• Prop the counterweight.

Photos: