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Build a Hydraulic Plane Launcher and use the power of hydraulic pressure to launch paper airplanes. The principle of the hydraulic machine is that a small force applied on a small piston is conveyed to generate a large force on the bigger piston the science behind what makes the system work – is Pascal’s Law. Simply stated, Pascal’s Law asserts that pressure applied to liquid anywhere within the enclosed system will cause equal pressure to be distributed everywhere else within that system(syringe based hydraulic control).