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Hi everyone! So I'm getting tired of putting out all the money on phenolic liners for testing propellant, which I typically get two uses out of for static testing ex APCP. I notice that the liner burns through the fastest in between BATES grains and remains structurally sound where there is no gap between grains. My thought is that with a properly designed star or finocyl you can have a single long grain with nearly the same curve as BATES grains and there would be no gaps between grains for the heat to hit the liner. Am I on the right track with switching to stars to get more life from my liners? What other considerations come into play when using a single grain star vs circular core BATES? The only thing that comes to mind is heat at the aft end wearing out the phenolic, but even so I can turn long liners into gradually shorter liners and get many more uses then when they burn through in the middle. I'm also curious why we do not see more star grains (and none from AT as far as I know). All I can think of is the large single grain makes shipping prohibitive and hence marketability non existent. Thanks in advance for the discussion and your input!
-Dan
-Dan