Oh no. Not TR-11! That’s the document that @Raygun insisted defined the Alpha fin shape even though it was really defined by a simple drawing by Bill Simon which was then printed as part of the SP-25 pattern sheet.
All the gory details here: https://www.rocketryforum.com/threads/vintage-astron-alpha-fin-pattern.15600/
All the gory details here: https://www.rocketryforum.com/threads/vintage-astron-alpha-fin-pattern.15600/
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