This Hydraulically operated and geared catapult is relatively easy tomake, will amaze your friends, and launch all sorts of things all in the name of scientific enquiry. There is information about the different gears at the end! Read more...

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$ 49.50
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This Hydraulically operated and geared catapult is relatively easy to make, will amaze your friends, and launch all sorts of things all in the name of scientific enquiry. There is information about the different gears at the end!