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We could also combine these two methods. The main reason why we don't like the "mock injector" method is because it would require us to make our annular gap even smaller than it currently is (6 thou) which is borderline impossible. We have talked with some engineers and they said the main concern with method #2 is cavitation. SoWe still don't understand how cavitation would be different for method #2, as our current understanding is that it only depends on injector pressure drop. If we find that different amounts of cavitation are a concern, we can use method #2 to test our annular flow (since that's incompressible fuel) and method #1 to test our nitrous mass flow. It's going to be really easy to test For the nitrous because , we can will just manufacture make an aluminum cylinder with some less radial holes – this is to offset the greater pressure drop. This would be really easy to test – another testament to why pintle injectors are so awesome.