Trebuchet basics
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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

Trebuchet Basics

Fritz R. Fiedler












Definitions

v0

a

h

Definitions




Efficiency
Efficiency

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


Efficiency1
Efficiency

Does not include effects of:

mass of beam

friction

air resistance

…?

Efficiency ~ 50% or less

(compute for report!)

so Rm < hm1 / m2)


Required information
Required Information

  • h : by design

  • m1 : by design

  • m2 : given


Projectile
Projectile

  • 3 lb exercise ball (m2)

  • Compute range with different counterweights…


Example simple calculation
Example Simple Calculation

assume: h = 4 feet

m1 = 50 lbs

given: m2 = 3 lbs

R < 67 feet


Design flexibility
Design Flexibility

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


Design flexibility1
Design Flexibility

  • Counterweight mass (m1)

  • h:

    • fulcrum height

    • starting position

    • beam length – how?

  • sling length

  • release angle


Counterweight
Counterweight

Design Constraint: must fit in 5-gallon bucket.

What materials might be appropriate?


Counterweight1
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


Other considerations
Other Considerations

  • Will it tip over?

  • Will the beam break?

  • Will the sling snap?

  • Will the throw be straight?


References
References

  • http://www.ripcord.ws/

  • http://www.algobeautytreb.com/


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