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

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Trebuchet basics

Trebuchet Basics

Fritz R. Fiedler


Basic sling trebuchet

Basic Sling Trebuchet


Example frame

Example Frame


Example beam

Example Beam


Example tip detail

Example Tip Detail


Release

Release


Trigger

Trigger


Sling

Sling


Basic trebuchet

Basic Trebuchet


Basic trebuchet1

Basic Trebuchet


The throw

The Throw


Definitions

v0

a

h

Definitions


Energy equations

Energy Equations


Range

Range


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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