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4 inch

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  1. Brian-Tampa

    MAC Black Fly

    Hello, I was thinking of purchasing a 4" Black Fly kit from MAC Performance. Their site does not have the correct RockSim file for this rocket in the 4" version. (.rkt file format) They do have the file for the 3" version which I downloaded and loaded into RockSim. The file is showing .33 margin...
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