Catapults: Bulldogs vs Athenians

Linked to the Masada Display and the I-Mag 2011 Catapult Challenge, this workshop aims to upscale

the science insights students have gained from modifying small catapults to increase range and accuracy

in their bid to hit the model Fortress of Masada in The Allen Centre.

Follow Peter and the two teams over the next few weeks as they design and build two giant catapults

and lay siege to the soccer field.

The Mission: Bigger, Better, Further, Faster - SPLAT!

Session 1:

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Think BIG but get the science right...

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Explore real machines to trigger some ideas...

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A Bulldog-Brainstorm to develop a design ...

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... turning thinking into sketches ...

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... a bit of advice to make sure it will work...

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Athenians in discussion about their trebuchet idea...

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Tim designing detail - the counterweighted throwing

arm ...

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Final concept drawings ready to be built ...

Athenians at the top; Bulldogs, down below.

Session 2: Construction begins...

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Discussing the construction...

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... the trebuchet idea...

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The wood arrives...

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Measuring out an exploded version of the plan...

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Chalking out the template...

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Explaining the notching technique...

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Laying out the timber...

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Notching the joins...

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Hammering in the nails...

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The Bulldogs' catapult frame...

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The Athenians' trebuchet frame...

Session 3: Erecting the frame...

The Bulldogs' Catapult

The Athenians' Trebuchet

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Bracing the side bars...

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Bracing the base...

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Measuring the gap...

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Stabilizing the uprights...

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Bracing the base

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Drilling holes for the pivot bar...

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Lashing with twine... hmmm ... let's try rope...

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Hacksawing the pivot bar...

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The catapult frame...

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The trebuchet frame... ( flag pole at the rear)

Catapult Workshop - Page 2: Session 4

Catapult Workshop - Page 3: Sessions 5 and 6

Catapult Workshop - Page 4: Session 7 : The Bulldogs' Challenge

Catapult Workshop - Page 5: Siege day