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“Float” Cardboard Vessel Contest November 1999 James Martin Lisia Rivera Lab Section 2 Outline/Overview: Introduction Objectives Constraints Approach Decision Preliminary Sketches Calculations Outline/Overview Cont: Prototype Refinement Implementation Results Conclusion

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float cardboard vessel contest november 1999

“Float” Cardboard Vessel ContestNovember 1999

James Martin

Lisia Rivera

Lab Section 2

Cardboard Vessel Contest ENGR 5-University of the Pacific

outline overview
Outline/Overview:
  • Introduction
  • Objectives
  • Constraints
  • Approach
  • Decision
  • Preliminary Sketches
  • Calculations

Cardboard Vessel Contest ENGR 5-University of the Pacific

outline overview cont
Outline/Overview Cont:
  • Prototype
  • Refinement
  • Implementation
  • Results
  • Conclusion
  • Improvements
  • Acknowledgements

Cardboard Vessel Contest ENGR 5-University of the Pacific

introduction
Introduction:

Buoyancy Force

  • Forces acting on object in water:
    • upward force: buoyancy force
    • downward force: weight force
  • Certain amount of water is displaced
  • The buoyancy force = volume of the displaced water

Captain + Vessel

Weight

Cardboard Vessel Contest ENGR 5-University of the Pacific

(water)

main objectives
Main Objectives:
  • To create a floatable vessel with only:
    • Corrugated, brown cardboard
    • Duct tape
  • Survive/optimize both the speed and endurance tests

Cardboard Vessel Contest ENGR 5-University of the Pacific

other objectives
Other Objectives:
  • Optimize endurance:
    • Durable design that will last in the water
  • Optimize speed:
    • Sleek with least amount of drag
  • Optimize size:
    • Just large enough for captain to fit in

Cardboard Vessel Contest ENGR 5-University of the Pacific

constraints
Constraints:
  • Vessel can only weigh 30 lbs.
  • Paddled by captain’s arms and legs
  • Only 50 ft of duct tape
  • No pre-constructed materials
  • Less than 5 feet width (lane markers)

Cardboard Vessel Contest ENGR 5-University of the Pacific

constraints cont
Constraints Cont:
  • Captain’s life vest must not go below water level for 3 seconds
  • Must complete 2 laps of UOP pool
  • Must survive the endurance test after completing laps

Cardboard Vessel Contest ENGR 5-University of the Pacific

approach idea 1
Approach:Idea #1:

Pontoon vessel

  • Advantages:
    • Traps air
    • Keeps vessel afloat
  • Disadvantages:
    • Water fill inside quickly
    • Hard for captain to navigate

(example of vessel—2D bottom view)

Cardboard Vessel Contest ENGR 5-University of the Pacific

approach idea 2
Approach:Idea #2:

(example of vessel—2D bottom view)

Boat-type vessel:

  • Advantages:
    • Minimize water drag
    • Very stable
  • Disadvantages:
    • Large size: hard for captain to navigate
    • Hard to build

Cardboard Vessel Contest ENGR 5-University of the Pacific

decision
Decision:

(Idea #2—Boat type vessel)

  • Because of the first structure’s weaknesses, we went with our second idea
    • will hold up longer in the pool
    • better balance, control, and speed
    • Less bulk weight

Cardboard Vessel Contest ENGR 5-University of the Pacific

decision cont
Decision Cont:

Key Features:

  • Front pointed and sloped upward:
    • Less water drag = faster speed
  • Wide body:
    • Easy to balance = faster speed
  • Tall sides:
    • Prevent water from flowing in = better endurance
  • Tall rear wall:
    • Prevent water from flowing in = better endurance

Cardboard Vessel Contest ENGR 5-University of the Pacific

preliminary sketches
Preliminary Sketches:

3D-Rear sketch (meters)

Cardboard Vessel Contest ENGR 5-University of the Pacific

preliminary sketches cont
Preliminary Sketches Cont:

2D Bottom Sketch (meters)

Cardboard Vessel Contest ENGR 5-University of the Pacific

preliminary sketches cont15
Preliminary Sketches Cont:

2D Top View (meters)

3D Side View (meters)

Cardboard Vessel Contest ENGR 5-University of the Pacific

final calculations
Final Calculations:
  • Buoyancy Force (force of water):
    • Equal to total weight (captain + vessel)
    • Buoyancy Force = (63.6kg +3.2kg)
  • Buoyancy Force=66.8kg

Captain + Vessel

Weight

Buoyancy Force

(water)

Cardboard Vessel Contest ENGR 5-University of the Pacific

calculations cont
Calculations Cont:
  • Submerged Volume (in water):
    • Bf=Liquid density * gravity * submerged volume
    • Bf=66.8kg
    • Liquid density of water = 1000 kg/m3
    • Gravity = 9.81 m/s2
  • Solve for Volume:
    • 66.8kg=(1000kg/m3)(9.81m/s2)(volume)
  • Volume = 0.0068 m3

Cardboard Vessel Contest ENGR 5-University of the Pacific

calculations cont18
Calculations Cont:
  • “Float” base area (in water):
    • Total Base area =(length*width) of square on vessel
    • Front nose doesn’t touch water, its area is excluded
    • Area = (0.79m*0.74m)
  • Area = 0.58m2

Length (0.74m)

Width (0.79m)

Cardboard Vessel Contest ENGR 5-University of the Pacific

calculations cont19
Calculations Cont:
  • Minimum height of vessel
    • Min height=submerged volume/base area
    • Volume =0.0068m3
    • Base area = 0.58m2
    • Min height=(0.0068m3)/(0.58m2)
  • Minimum height = 0.12m
  • Our vessel height = 0.3 m, thus meeting this criteria

Cardboard Vessel Contest ENGR 5-University of the Pacific

testing prototype
Testing Prototype:
  • Prototype = 1/3 scale of vessel
  • Wrapped prototype in plastic
  • Tested in pool with heavy rocks (50 lbs)
  • Vessel survived
  • Needed improvements
    • Sides, dimension, layers

Cardboard Vessel Contest ENGR 5-University of the Pacific

(Prototype being tested)

prototype pictures cont
Prototype Pictures Cont:

Cardboard Vessel Contest ENGR 5-University of the Pacific

(Testing out Prototype)

refinement changes
Refinement/Changes:
  • Too wide:
    • Width 0.79m instead of 1.1m
    • Length 1.0m instead of 1.1m
  • Sloped rear upward:
    • Help with captain’s weight and balance

0.79m width

(“Float” side view)

Cardboard Vessel Contest ENGR 5-University of the Pacific

1.0m length

refinement changes cont
Refinement/Changes Cont:
  • Layered bottom and sides:
    • More strength
    • Better endurance
  • Decreased side height:
    • Side walls: 0.3m instead of 0.5m
    • Rear wall: 0.27m instead of 0.3m
    • Help captain use his legs
    • Based on calculations

0.27m height

Cardboard Vessel Contest ENGR 5-University of the Pacific

0.3m height

implementation
Implementation:
  • The vessel took approximately seven hours to complete
  • Built the vessel in the basement of Casa Werner

(Side view of “Float”)

Cardboard Vessel Contest ENGR 5-University of the Pacific

implementation cont
Implementation Cont:

(Top view of “Float”)

(Bottom view of “Float”)

Cardboard Vessel Contest ENGR 5-University of the Pacific

implementation cont26
Implementation Cont:

(Prototype and “Float”)

(Side view of “Float”)

Cardboard Vessel Contest ENGR 5-University of the Pacific

the big day results
“The Big Day” Results:
  • “Float” completed 2 laps:
    • Speed: 1 minute, 11 seconds: 1st in heat
    • Endurance: 16 minutes, 13 seconds
  • Fulfilled all criteria and constraints

(Pre-competition gathering)

Cardboard Vessel Contest ENGR 5-University of the Pacific

the big day cont
“The Big Day” Cont:

(“Float” starting off the two laps, testing out speed)

(The return trip back)

Cardboard Vessel Contest ENGR 5-University of the Pacific

the big day cont29
“The Big Day” Cont:

(Captain Mike testing out “Float’s” endurance)

(The endurance competition)

Cardboard Vessel Contest ENGR 5-University of the Pacific

conclusion
Conclusion:
  • Float fulfilled specified constraints
    • Weighed 3.2kg (7 lbs)
    • Used under 15.2m (50 ft) of duct tape
    • Was constructed with corrugated, brown cardboard only

(“Float” side view)

Cardboard Vessel Contest ENGR 5-University of the Pacific

conclusion cont
Conclusion Cont:
  • Front sloped end:
    • Provided less drag=faster time
  • Back sloped end:
    • Provided both strength and durability in holding captain
  • Layered bottom:
    • Kept water out
    • Strength for endurance test

(“Float” bottom view)

Cardboard Vessel Contest ENGR 5-University of the Pacific

conclusion cont32
Conclusion Cont:
  • Layered sides:
    • Extra strength for endurance test
  • Efficient use of duct tape:
    • Held “Float” together
    • Kept water out as long as possible
  • Small size:
    • Easy maneuverability
    • Lightweight
    • Optimized structure strength

Cardboard Vessel Contest ENGR 5-University of the Pacific

(“Float” top view)

possible improvements
Possible Improvements:
  • Better visibility:
    • Hard for captain to see, sitting backwards
  • More layered cardboard in front:
    • More strength, longer endurance
  • More layered cardboard in corners:
    • Better strength, longer endurance

Cardboard Vessel Contest ENGR 5-University of the Pacific

acknowledgements
Acknowledgements:
  • Other members of our group:
    • Xiaojin Gan
    • Captain Mike: keeping “Float” floating for as long as possible
  • Hector Rivera for cardboard
  • Melanie Badinski for pictures of competition and use of scanner

Cardboard Vessel Contest ENGR 5-University of the Pacific