The structural assembly 11, wherein each of the protrusions is a blade having an elongated wedge like shape with outer surfaces, and each of the spar receptacles is a trough having a tapered Y shaped cross section with {HEAD ~ inner surfaces}, and wherein respective ones of {TAIL ~ the outer surfaces} abut respective ones of the inner surfaces to define interfaces that are wet by the adhesive 
The structural assembly 11 , wherein each of the protrusions is a blade having an elongated wedge like shape with outer surfaces , and each of the spar receptacles is a trough having a tapered Y shaped cross section with { HEAD ~ inner surfaces } , and wherein respective ones of { TAIL ~ the outer surfaces } abut respective ones of the inner surfaces to define interfaces that are wet by the adhesive
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