Any ideas?

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Hey guys. On monday i'm going to take part in this competition where you have to design and test a proper liquid fuel rocket (proper engine fuel not just the silly water rockets) I was just wondering if anybody had any ideas because this competition is quite important to me as if i win i will be given the oportunity to go to america. I was just wondering if anybody had any ideas as to how to make a liquid fuel rocket and also how to make it better than the rest? Thanks guys :D