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-Cover Distance of 1.5m
-No Intermediate Supports
-No Adhesives (Glue or Tape)
-Max Deflection
-(Lower Cost)
-(Reversibility of Own Materials)

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-(120-220kg/m^3) Density unless seasoned.
-Up to 15Nm Toughness
-300N Hardness
-3.71GPa Elastic Modulus
- CAN GET WATER SPOILED (weather)
-Flammable

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-1.82mm Diameter (Very Thin)
-1300kg/m^3 Density
-(3.5-4.5%) Elongation
-(393-723MPa) Tensile Strength
-26.5GPa Youngs Modulus

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1) Suspension Bridge
2) Cable - Stayed Bridge
3) Truss Bridge
4) Tied Arch Bridge

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Modulus of Elasticity of Balsa wood : 3.0-3.71 GPa

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Vertical deflection when load applied must be less than 1:10 of total length of bridge
Beam deflection formulas

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Width?
Overall Length past 1.5m?
Effect on deflection?

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Recyclable materials
Less material the better
Extra Points for Reversibility

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String
Wire
Shoe Laces
Bolts
Rubber bands

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Layering

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Pratt, Warren, Howe, Baltimore

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Arch
Beam
Cantilever
Suspension
Cable-Stayed
Truss

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Balsa wood sheets
Balsa wood strips
Split Pins
Paper Straws
Natural Jute Twine

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Craft Sticks
Nails
Pins
Wood