Parabolic Hacky Sack Parabolic Hacky Sack LaunchLaunch

Mechanism Mechanism

Kristin Hans • Khalid Al Mehairi • Mark Quijano • Jonathan Kristin Hans • Khalid Al Mehairi • Mark Quijano • Jonathan KoehlerKoehler

The Bamboo Launchers

School of Engineering University of the Pacific

Presentation done by:

Mark Quijano & Khalid Al Mehairi

School of Engineering • University of the Pacific

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OutlineOutline IntroductionIntroduction Constraints/CriteriaConstraints/Criteria Preliminary IdeasPreliminary Ideas RefinementRefinement ImplementationImplementation Decision/Final DesignDecision/Final Design ResultsResults Suggested ImprovementsSuggested Improvements ConclusionsConclusions AcknowledgementsAcknowledgements

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IntroductionIntroduction

Engineering 5 ProjectEngineering 5 ProjectDesign Mechanism Design Mechanism Mechanism must travel down a Mechanism must travel down a

ramp ramp Launch Hacky Sack after reaching Launch Hacky Sack after reaching

end of rampend of rampCreate Teamwork skillsCreate Teamwork skills

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Constraints/Criteria Constraints/Criteria

Constraints Constraints 18in x 18in x 18in 18in x 18in x 18in

max max 10 lbs. Max10 lbs. Max60 sec Prep time 60 sec Prep time 1 ft setup on ramp1 ft setup on ramp20 ft distance 20 ft distance

min/maxmin/max$20 max$20 max

CriteriaCriteriaOptimize weightOptimize weightOptimize sizeOptimize sizeLaunch as close as Launch as close as

possiblepossible

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Figure 1

Trigger

Wooden Spoon

Wheels

Trigger

weightFigure 2

Trigger

elasticFigure 3

Trigger

springFigure 4

Preliminary IdeasPreliminary Ideas

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RefinementRefinementProsPros

Figure 1Figure 1 LighterLighter

Figure 2Figure 2 Easy to calculate Easy to calculate

distancedistance Figure 3Figure 3

More AccurateMore Accurate Figure 4Figure 4

More powerMore power LighterLighter

ConsCons Figure 1Figure 1

Unreliable triggerUnreliable trigger Figure 2Figure 2

HeavyHeavy Figure 3Figure 3

Unreliable triggerUnreliable trigger Figure 4Figure 4

Hard to calculate forceHard to calculate force

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Refinement Cont.Refinement Cont.

Figure 4

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ImplementationImplementation

Simulated 3ft Simulated 3ft ramp with 30º ramp with 30º angleangle

Numerous trail Numerous trail launcheslaunches

Adjustment on Adjustment on elastic forceelastic force

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Decision/Final DesignDecision/Final Design

Energy stored in elastic bands and Energy stored in elastic bands and springssprings

Made from:Made from: Wood, springs, cup, wire, wheels, bamboo, Wood, springs, cup, wire, wheels, bamboo,

screws, duct tape, gluescrews, duct tape, glue

1496in1496in33

Lightweight – 2lbsLightweight – 2lbsConsistent in testingConsistent in testing

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ResultsResults

Distance Distance (D(DTT))

Volume Volume (V(Vprepre))

Weight Weight (W(Wactact))

FOMFOM

Trial 1Trial 1

Trial 2Trial 2

.25 ft.25 ft 1496 in1496 in33 2 lbs2 lbs3.17 ft3.17 ft 1496 in1496 in33 2 lbs2 lbs

2.5x – W lbs 10 75

V– 30 x5D– 20 act

preT

AverageAverage

FOMFOM

121.51121.51

x5.25– 20

75.98

75

149630

05.10

5.2x210

20

128.8128.8

x53.17– 20

15.84

75

149630

05.10

5.2x210

20

114.2114.2

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Suggested ImprovementsSuggested Improvements

Stronger Pivot jointStronger Pivot joint Better aimBetter aim More constant distanceMore constant distance

Lighter woodLighter wood Optimize weightOptimize weight

Drill pilot holesDrill pilot holes Prevent crackingPrevent cracking

Move back wheels forwardMove back wheels forward Fit on start areaFit on start area

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ConclusionsConclusions

22ndnd Place with average FOM of Place with average FOM of 121.51121.51

.25ft from target.25ft from targetFinal DesignFinal Design

Wooden Design w/ 4 wheelsWooden Design w/ 4 wheelsSpring and Elastic PoweredSpring and Elastic PoweredCatapult MethodCatapult Method1496in1496in33 and 2 lbs and 2 lbs

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AcknowledgementsAcknowledgements

Calaveras RiverCalaveras RiverOrchard Supply storeOrchard Supply storeMr. Mr. KoehlerKoehler

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