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Well, Pirat-H was undergoing wind tunnel tests when Fritz X was practically operational, so it's hard to tell they were competitors. Of course, one can assume, works on both of them were started in the same period and Fritz was chosen already before prototypes were built - but Rheinmetall still continued theoretical works with the Pirat until 1942, just to obtain more experiences. There are examples of projects still continued after their official cancellation, e.g. Rheintochter R III.