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Trebuchet Basics

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Trebuchet Basics

Fritz R. Fiedler

v0

a

h

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

Does not include effects of:

mass of beam

friction

air resistance

…?

Efficiency ~ 50% or less

(compute for report!)

so Rm < hm1 / m2)

- h : by design
- m1 : by design
- m2 : given

- 3 lb exercise ball (m2)
- Compute range with different counterweights…

assume:h = 4 feet

m1 = 50 lbs

given:m2 = 3 lbs

R < 67 feet

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

- Counterweight mass (m1)
- h:
- fulcrum height
- starting position
- beam length – how?

- sling length
- release angle

Design Constraint: must fit in 5-gallon bucket.

What materials might be appropriate?

- 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

- Will it tip over?
- Will the beam break?
- Will the sling snap?
- Will the throw be straight?

- http://www.ripcord.ws/
- http://www.algobeautytreb.com/