{HEAD ~ 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 inner surfaces, and wherein {TAIL ~ respective ones} of the outer surfaces abut respective ones of the inner surfaces to define interfaces that are wet by the adhesive 
{ HEAD ~ 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 inner surfaces , and wherein { TAIL ~ 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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