PARABOLIC FOOD AID DELIVERY SYSTEM TIM JONES NHAN NGUYEN BLOODY MARY School of Engineering and Computer Science University of the Pacific Fall 2002 ENGR 5: Lab Section 3

OVERVIEW BLOODY MARY Introduction Constraints & Criteria Project Objectives Approach: Design Process Discussion of Results Suggested Improvements Conclusions Acknowledgements

INTRODUCTION BLOODY MARY Purpose: design a mechanism to launch a Food Aid Package over a wall to a designated point

CONSTRAINTS BLOODY MARY Volume  18x18x18 inches weight  10 lbs. Cost  $20 No motors or propellants 1 minute to set up start behind the line

CRITERIA BLOODY MARY Minimize size Minimize weight Maximize accuracy

PROJECT OBJECTIVES BLOODY MARY Start line 4 in 3.5 ft 10 ft FAP TARGET SPOT 6 ft 2 in PYTHON- INFESTED JUNGLE BOUNDARY

PRELIMINARY IDEAS BLOODY MARY Preliminary Idea #1: CatapultPreliminary Idea #2: Cannon

PRELIMINARY IDEAS (CONTINUED) BLOODY MARY Preliminary Idea #3: SlingshotPreliminary Idea #4: Mouse trap

REFINEMENT BLOODY MARY PROS  enough force  accurate CONS  dimensions  fall into infested river rubber band wheels FAP PFADS Preliminary Ideas #1: Catapult

REFINEMENT (CONTINUED) BLOODY MARY PROS  enough force  easy to construct CONS  durability of elastic band  height may exceed  inaccurate wheels rubber band FAP PFAD Preliminary Ideas #3: Slingshot

DECISION BLOODY MARY wheels screws trigger rubber band FAP Preliminary Idea #3: Slingshot

CONSTRUCTION BLOODY MARY copper bars springs wheels screws copper bars Gathered the materials Cut the bars to length

CONSTRUCTION (CONTINUED) BLOODY MARY wheels screws copper bar Soldered the frame together Screwed on the wheels

CONSTRUCTION (CONTINUED) BLOODY MARY Attached the springs spring ____ copper bar ___ wood copper wire _____ ______ Developed a triggering device

TESTING BLOODY MARY

FINAL MECHANISM BLOODY MARY screw arm band ice trays hook arm bar screws hinge wheels trigger Side View: Catapult springs ___________

FINAL MECHANISM (CONTINUED) BLOODY MARY Front View: Catapult Length=26.5 in Width=15.5 in Height=9.75 in Weight=4 lbs FAP springs wheels ice trays arm bar

RESULTS BLOODY MARY 1 st Trial: Did not launch  Hook would not attach to PVC pipe 2 nd Trial: Did not launch  Hook would not attach to PVC pipe 3 rd Trial: Did not launch  Container ripped

RESULTS (Continued) BLOODY MARY Advantages: Weight Went down the ramp Disadvantages: Exceed dimension limit Did not launch the package in any of the three trials

SUGGESTED IMPROVEMNTS BLOODY MARY Stronger structures Smaller dimensions More durable container Time Management

CONCLUSION BLOODY MARY Performance: poorly due to error in design constraints: 18x18x18 volume criteria: size, weight, and accuracy. final design: catapult. suggested improvements: stronger structures and smaller dimensions.

ACKNOWLEDGEMENTS BLOODY MARY Professor Camilla Saviz & Kurt Schulz Employees at Home Depot