Float Cardboard Vessel Contest November 1999

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# Float Cardboard Vessel Contest November 1999 - PowerPoint PPT Presentation

“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 ContestNovember 1999

James Martin

Lisia Rivera

Lab Section 2

Cardboard Vessel Contest ENGR 5-University of the Pacific

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

Cardboard Vessel Contest ENGR 5-University of the Pacific

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

Cardboard Vessel Contest ENGR 5-University of the Pacific

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:
• 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:
• 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:
• 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:
• 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:

Pontoon vessel

• Traps air
• Keeps vessel afloat
• 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:

(example of vessel—2D bottom view)

Boat-type vessel:

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

Cardboard Vessel Contest ENGR 5-University of the Pacific

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:

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:

3D-Rear sketch (meters)

Cardboard Vessel Contest ENGR 5-University of the Pacific

Preliminary Sketches Cont:

2D Bottom Sketch (meters)

Cardboard Vessel Contest ENGR 5-University of the Pacific

Preliminary Sketches Cont:

2D Top View (meters)

3D Side View (meters)

Cardboard Vessel Contest ENGR 5-University of the Pacific

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:
• 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 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 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:
• 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:

Cardboard Vessel Contest ENGR 5-University of the Pacific

(Testing out Prototype)

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:
• 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:
• 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:

(Top view of “Float”)

(Bottom view of “Float”)

Cardboard Vessel Contest ENGR 5-University of the Pacific

Implementation Cont:

(Prototype and “Float”)

(Side view of “Float”)

Cardboard Vessel Contest ENGR 5-University of the Pacific

“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:

(“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” Cont:

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

(The endurance competition)

Cardboard Vessel Contest ENGR 5-University of the Pacific

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:
• 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 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:
• 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:
• 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