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