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When you look at one of the Sikorsky  drop test vehicles it has a noticeable chine that is not apparent in the drawings. That may be because Sikorsky would also have been asked for a design with reduced signature. It may not be a coincidence that at the time Northrop white world advanced design were asked to study a helicopter with reduced RCS for Sikorsky. We thought that an unusual request since helicopter engineers and aircraft engineers never mix. We gave the job to John B., one of our most creative configurators, and he came up with something that, although not as radical as the Boeing low RCS design, had significant shaping. It got sent off to them and we heard no more. Sorry no drawings.