The recommendation was taken not only by Klemm, with its Kl 105, Siebel with the Si 202 Hummel and Fieseler with the Fi 253 Spatz, Luftarchiv – Fieseler but apparently as well by Bücker with its Bü 134 Student, of which only one was built, even though the Bü 134 was powered by a Hirth HM 504 A motor which with 105 horsepower fell a bit beyond the scheme. [