For my school science fair, I am buildinga hydrolic launch system and I need some ides on how I should build this!

It is important that you don't miss-spell the word "hydraulic" in your project.

Second, google can be your friend. A simple search landed me with this in just a second or so.

How Kingda Ka works- Hydraulic launch system of Kingda Ka roller coaster at Six Flags Great Adventure in New Jersey

It's about Kingda Ka and it's launch system.

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Interesting project. I would look at Hydraulically Launched coasters like Katie pointed out.

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Michael C