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Trebuchet Basics

Trebuchet Basics. Fritz R. Fiedler. Basic Sling Trebuchet. Example Frame. Example Beam. Example Tip Detail. Release. Trigger. Sling. Basic Trebuchet. Basic Trebuchet. The Throw. v 0 a. h. Definitions. Energy Equations. Range. Efficiency.

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Trebuchet Basics

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  1. Trebuchet Basics Fritz R. Fiedler

  2. Basic Sling Trebuchet

  3. Example Frame

  4. Example Beam

  5. Example Tip Detail

  6. Release

  7. Trigger

  8. Sling

  9. Basic Trebuchet

  10. Basic Trebuchet

  11. The Throw

  12. v0 a h Definitions

  13. Energy Equations

  14. Range

  15. Efficiency What affects efficiency and what would you expect the actual efficiency to be?

  16. Efficiency Does not include effects of: mass of beam friction air resistance …? Efficiency ~ 50% or less (compute for report!) so Rm < hm1 / m2)

  17. Required Information • h : by design • m1 : by design • m2 : given

  18. Projectile • 3 lb exercise ball (m2) • Compute range with different counterweights…

  19. Example Simple Calculation assume: h = 4 feet m1 = 50 lbs given: m2 = 3 lbs R < 67 feet

  20. Design Flexibility What aspects of the trebuchet can be varied (after primary construction) to change throw distance?

  21. Design Flexibility • Counterweight mass (m1) • h: • fulcrum height • starting position • beam length – how? • sling length • release angle

  22. Counterweight Design Constraint: must fit in 5-gallon bucket. What materials might be appropriate?

  23. Counterweight • 5 gallons = 0.67 ft3 • water: 62.4 lb/ft3 • sand (dry): ~110 lb/ft3 • sand (saturated): ~135 lb/ft3 • concrete (ordinary): ~120-150 lb/ft3 • steel: ~490 lb/ft3 • lead: ~710 lb/ft3

  24. Other Considerations • Will it tip over? • Will the beam break? • Will the sling snap? • Will the throw be straight?

  25. References • http://www.ripcord.ws/ • http://www.algobeautytreb.com/

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