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Trebuchet Basics Fritz R. Fiedler
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Basic Sling Trebuchet
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Example Frame
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Example Beam
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Example Tip Detail
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Release
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Trigger
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Sling
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Basic Trebuchet
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The Throw
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Definitions v 0 h
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Energy Equations
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Range
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Efficiency What affects efficiency and what would you expect the actual efficiency to be?
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Efficiency Does not include effects of: mass of beam friction air resistance …? Efficiency ~ 50% or less (compute for report!) so R m < hm 1 / m 2 )
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Required Information h : by design m 1 : by design m 2 : given
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Projectile 3 lb exercise ball (m 2 ) Compute range with different counterweights…
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Example Simple Calculation assume:h = 4 feet m 1 = 50 lbs given:m 2 = 3 lbs R < 67 feet
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Design Flexibility What aspects of the trebuchet can be varied (after primary construction) to change throw distance?
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Design Flexibility Counterweight mass (m 1 ) h: –fulcrum height –starting position –beam length – how? sling length release angle
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Counterweight Design Constraint: must fit in 5-gallon bucket. What materials might be appropriate?
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Counterweight 5 gallons = 0.67 ft 3 water: 62.4 lb/ft 3 sand (dry): ~110 lb/ft 3 sand (saturated): ~135 lb/ft 3 concrete (ordinary): ~120-150 lb/ft 3 steel: ~490 lb/ft 3 lead: ~710 lb/ft 3
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Other Considerations Will it tip over? Will the beam break? Will the sling snap? Will the throw be straight?
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References http://www.ripcord.ws/ http://www.algobeautytreb.com/
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