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He says in a reply to someone else that Zirkon is supposed to have higher-energy solid propellant than Islander.


As for the sketch, I've followed up the original source, and it may be unrelated to Zircon as it is from a patent on Nitrogen Gas Generators:


[URL unfurl="true"]https://patents.google.com/patent/RU2148180C1/en?oq=RU+2148180[/URL]


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