Thanks for information, I know that MBB was involved in Comanche rotor design and I thought that this wind tunnel model was also for LHX program. Looks like Boeing concept artworks from LHX thread.
I agree with the similarity. Very little info is available on the internet for Eurocopter's HSH, but I suspect it may have something to do with the later X3 and X4 programs (both high-speed helicopter efforts, as the former abbreviation seems to suggest).
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