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Putting it bluntly: nose shape has relationships with width, height and maximum vehicle length. Naca found that a 2" radius nose on their laminar semi symmetrical series was required for the laminar flow but mostly for stall conditions. As illustrated by the F104 wing, things get squirrelly really fast in a sharp edge wing at stall. The template addresses having a decent passenger compartment and a front mounted engine with that ugly profile otherwise you need lay flat passengers and a pancake motor.
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