Team JADS1 The PFADS Competition Team JADS David Rosenberry Adam Yee ENGR 5 - Lab 5

Team JADS2 Outline Problem Definition –Introduction/Background –Criteria and Constraints –Project Objectives Design Process –Preliminary Ideas –Refinement –Decision/Implementation

Team JADS3 Outline Design Process continued –Construction & Testing –Final Design Mechanism Results and Discussion Suggested Improvements Conclusions Acknowledgements

Team JADS4 Introduction/Background Problem: Design PFADS for UNICEF –Parabolic Food Aid Delivery System –PFADS must deliver Food Aid Package to target location

Team JADS5 Introduction/Background PYTHON-INFESTED JUNGLE BOUNDARY 4 in 4 ft 8 ft START LINE FAP TARGET SPOT 6 ft 2 in 3.5 ft 10 ft 7 ft FAP TARGET SPOT START LINE 1 ft 2 ft FAP TARGET SPOT TRACK 1 TRACK 2 Piranha Infested River 3.5 ft 10 ft 6' 2" Wall 10 ft PYTHON-INFESTED JUNGLE BOUNDARY

Team JADS6 Introduction/Background Design Quality Based on FOM –Figure of Merit Highest FOM score wins competition

Team JADS7 Constraints PFADS: –Weight< 10 lbs. –Length< 18 in. –Width< 18 in. –Height< 18 in. –Cost< $20.00 –Built using no pre-constructed materials

Team JADS8 Criteria Hit target 10 feet away and maximize accuracy Go over 6’ 2’’ high wall Device launches when trigger hits barrier Complete device must remain behind barrier Minimize Weight(< 10 lbs.) Minimize Volume(< 18’’x18’’x18’’)

Team JADS9 Project Objectives Design and construct a PFADS using the design process. Practice Teamwork Create and Give a Formal Presentation

Team JADS10 Preliminary Ideas Sean McNaryAdam Yee John Yoshimura David Rosenberry

Team JADS11 Refinement  Pros  Simple Release Mechanism  Weight of Launcher  Materials Easy to Obtain  Cons  Accuracy of launch  Low release angle  FAP launch distance  Total Volume of Device Design 1

Team JADS12 Refinement Pros –Large, Stable Base –Smaller Launch Arm –Simple Trigger –Weight of Launcher –Materials Easy to Obtain Cons –FAP Launch Distance –Launch Accuracy –Launcher Volume Design 2

Team JADS13 Refinement Pros –Launcher Volume –Launcher Weight –Materials Easy to Obtain Cons –FAP Launch Distance –Launch Accuracy –Incorporating Rat Trap in Launcher –Low Launch Angle Design 3

Team JADS14 Refinement Pros –FAP Launch Distance –Launch Accuracy –Materials Easy to Obtain Cons –Launcher Volume –Launcher Weight Design 4

Team JADS15 Decision/Implementation Every design relatively simple to construct and use obtainable materials. Designs 1-3 have similar launch mechanisms –Steep launch angle reduces power of catapult Design 4’s launch mechanism should be more consistent with additional modification (Frame with Rails).

Team JADS16 Decision/Implementation Modification: Frame with rails to guide PFAD. Design 4 selected to be constructed.

Team JADS17 Construction and Testing First Design: –Weight: 9 lbs. –Height: 17.5 inches Testing: –FAP launched over wall –PFADS flipped over wall Problems: –High center of gravity –Rolled down ramp fast

Team JADS18 Construction and Testing Solutions –To prevent PFADS flipping over wall: Reduced Volume and Weight of PFADS to lower center of gravity Added brace with foam padding Removed wheels & added skis to reduce speed

Team JADS19 Final Mechanism (Side View) Total Weight: 7 lbs. Key Features: –PVC frame with rails to guide FAP –Metal rod unhooks gate latch to release FAP –Skis to slide down ramp –Foam Bumper –Adjustable Launch Angle

Team JADS20 Final Mechanism (Rear and Front View) Total Weight: 7 lbs.

Team JADS21 Results/Discussion Finished 4 th –Final FOM: Advantages –Able to adjust launch angle –Launched FAP over wall consistently –PFADS remained behind ramp barrier Disadvantages –Weight and Volume –FAP hit target but rolled away

Team JADS22 Suggested Improvements Use Lighter Materials –Wood is a heavy material –Construct frame using lighter material such as aluminum Improve Launch Angle Mechanism –Don’t use nails

Team JADS23 Conclusions Key Criteria and Constraints –Launch FAP over 6’2” wall to target with accuracy –PFADS Mechanism Weight < 10 lbs. Volume < 18” x 18” x 18” Use No Pre-constructed Materials

Team JADS24 Conclusions Final Design –Used Sling-shot mechanism to launch FAP –Lighter and smaller than original design –Trigger: Metal rod pushed gate hook off an eye bolt –PFADS remained behind barrier –Launched FAP over wall consistently

Team JADS25 Conclusions Mechanism Performance –Successfully Launched During Both Trials –Trial Distances 4’ and 3.25’ –Finished in 4 th Place First FOM Second FOM Total FOM

Team JADS26 Conclusions Improvements –Reduce weight and size of PFADS –Improve Launch Angle Mechanism –Improve accuracy by preventing FAP from rolling away from target

Team JADS27 Acknowledgements Team JADS would like to thank the following individuals for their time and help: Professor Saviz Professor Schultz Bob Pollard Adrian the Machinist ENGR 5 Introduction to Engineering Course Manual