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It is the year 1297. There are rumours that enemies are thinking of invading your town. Could you help by building a castle, in which the townspeople can all shelter if an invasion does take place?
Levels of difficulty:
Level 1 - Build a simple castle with walls and a tower Level 2 - As level 1, plus a drawbridge that opens and closes when a handle is turned Level 3 - As level 2, plus a portcullis that raises and lowers when a handle is turned
Equipment: KNEX set, plus K'NEX panels if you have them, or cardboard/ corrugated plastic (eg Correx) if not. Also or levels 2 and 3: 1m lengths of string.
Approach: Think about how to design your castle. What shape will it be? How can you make it as strong as possible? If you are using K'NEX panels, how can you build these in to make walls for your castle? If you haven't got K'NEX panels, can you make walls out of cardboard or corrugated plastic? For level 2, how could you make a drawbridge that will go up and down when you turn a handle?For level 3, how could you make a portcullis out of KNEX, and raise it and lower it?