Hi,
the Germany designer,Alphons Pützer started his activities by building sailplane,first
called Doppelraab,created by Fritz Raab,and followed by Motorraab as a powered
glider,developed into Elster,which appeared in three versions,Elster, Elster B and
Elster C.
A numbered of experimental airplanes were built,such as Horten Ho.33,Dohle,C1
and C2,proceeded by MS.60 single seat motor glider and SR.57 Busard,a two-seat
low-wing with Y-shape tail unit.
In cooperation with Alpavia which built Mr. Fournier aircraft,RF-3,RF-4,RF-5,RF-6,
RF-7 & RF-9,later redesigned the RF-6C into RS-180 Sportsman light airplane,and
RF-5 used for the basis to invent S5,which a stealth or very quiet research aircraft.
https://www.secretprojects.co.uk/forum/index.php/topic,7282.msg58478.html#msg58478
He also with A. Hufer made a flying car Project.
Flieger Revue Extra 74
