At home we made a trebuchet out of knex and an allastic band. It fires automatically and it can fire knex cogs. we also aimed it at some targets made of paper and a wheel.
by Nathan and Harry
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Moorfield Primary School 
nice trebuchet out of knex
I think this is a very good model I’m the one on the right it took half an hour.
Nice one Nathan and Harry how did you build your model?
#BrilliantBloggers
well done that is nice.