TREDS

1
TREDS

• The Hard Boilers
• Chris Chapman
• Megan Kalend
• See Vang
• ENGR 5
• University of the Pacific

2
Overview

• Problem
• Approach
• Results
• Improvements
• Conclusions
• Acknowledgements

3
Problem

• Refugees inhabiting a region across a thirty-foot
  wide river are in need of eggs. These must be
  delivered across the rebel-patrolled waters.

4
Constraints

• Size requirements
• Timed delivery
• Range
• Target restrictions
• Egg delivered intact
• Cost efficiency

5
Approach

• Preliminary Ideas
• Refinement
• Analysis
• Implementation
• Testing

6
Preliminary Ideas

• Catapult or Trebuchet?
• Pros
• Cons
• EPU
• Materials
• Shape

7
Catapult Refinement

• Implemented elastic power source in place of
  counterweight
• Pros
• Cons

8
EPU Refinement

• Material
• Armaflex rubber insulation
• Shape
• Modified barbell

9
Analysis

• Conservation of Energy
• Elastic Energy

10
Analysis

• Projectile motion

11
Implementation

• Using Laws of Conservation
• Logical Estimation
• Preliminary Platform

12
Testing

• Trial Setup

13
Results

• Final design
• Competition performance
• Analysis

14
Successful Trial Data
Trial Number Radial Distance from Center (ft., in.)
1 0 ft. 1 in.
2 5 ft. 9 in.
3 3 ft. 1 in.
4 4 ft. 0 in.
5 4 ft. 0 in.
6 4 ft. 0 in.
7 4 ft. 4 in.
8 2 ft. 11 in.
9 5 ft. 1 in.
10 0 ft. 9 in.
11 5 ft. 4 in.
12 3 ft. 7 in.
13 0 ft. 6 in.
15
Future Improvements

• Time Constraints
• Allow for scheduling problems and last-minute
  system checks
• Optimization
• Optimize system in each step of design and
  construction process
• Efficiency
• Solve glitches to create a more effective TREDS.

16
Conclusions

• Constraints and Criteria
• Final Design
• Competition Performance
• Improvements
• Any Questions???

17
Acknowledgements

• Mr. Jared Lash of Saint Marys High School
• Michael Kalend