Hi,
the Hüffer HB.28b was a two seat parasol-wing sporting aircraft,powered by one
Anzani 60-hp engine, later by a Siemens Sh 13A engine with 88-hp.
Die Deutsche Luftruestung 1933-1945 - Vol.3 - Henschel-Messerschmitt
Flugzeug-Typenbuch von 1944
Who know Hüffer HK.37 ?,