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The piston must be able to supply enough force to at its operating pressure to break the shear pins with a ?x safety factor before material deformation (this will allow for a smaller, but significant, safety factor on piston use in-flight). This safety factor was chosen using the 1974 NASA Aerospace Pressure Vessel Safety Standard . According to NASA standards, there must be a minimum ?x safety factor between this operating pressure and the design burst pressure [3].

As of 12/27/2017, we plan on using 180lbs of shear pins, making for a desired yield force of 720lbs. This analysis makes use of thin-walled pressure vessel theory [2], paraphrased below:

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