Educate Me: Why wouldn't you use a QEV?

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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psycix
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A homemade piston valve may offer a better flow than a QEV. That's why.
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tauschung
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Ok, I think I got it. Now to ask an obvious question.

How would you know which valve would perform better by design (in say a smaller cannon)? By testing it, or would the GGDT be able to predict the performance?
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psycix
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GGDT can predict the performance if you model it accurately. Of course testing will tell it for sure.
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