It seems to me that a fincan has a body tube that is affixed to / built with the fins and is shorter than the motor...
Does airframe-free mean that fins, engine, and nosecone must only be connected to each other by the structure of the engine?
You are basically turning your engine casing into your airframe then (assuming definition of airframe means the structure that connects nose cone to fins).
Maybe this actually means that engine combustibles are loaded directly into airframe so maybe this is a engine-casing-free competition (reloads go directly into airframe).
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