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Mr. Hans Wagener was a German designer,formed Wagener Flugzeugbau,and he began with HW 1 & HW 2,followed by HW 3 Pique Ass,it was a light aircraft powered by one Walter NZ 60,the HW 3a was powered by one Argus As 8 engine.
The main airplane in his series was the HW 4,it was a single seat parasol high-wing monoplane,as a sporting light aeroplane,powered by one Ursinus U2 engine,and HW 4a was powered by one Festenberg-Pakisch engin