Herbert Gropp studied in Chemnitz and tried to build a small plane (don´t know if it has ever flown). He has an interesting CV which is covered by Lemke in an small book. Very interesting. Gropp worked together with Villinger (Mufli) had known Grönhoff and others, and worked for DKW (cars and motorcycles) and finally for Heinkel. He was also involved to some extend in the Chemnitz C-10 powered glider. I think in the developement of its prop. At DKW he did some research in aerodynamic covering of motorcycles. He died in 1940 on a testflight with the He-177 V2 (CD+RQ) at Graal at the Baltic Sea. Together with him the son of Oscar Ursinus (Fritjof Ursinus) died too.

Exciting to find out that photographs of the C-10 cockpit still exist! I've been having trouble finding photos of the cockpits of a lot of gliders (The Seeadler's cockpit dash was recorded though!)

*edit* Upon closer inspection it is another aircraft... not the C-10 which has the cockpit photo!? My mistake!
 
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Yes, you´re right, but it is a unique piece and a beauty !!!!!!
 
Thank you my dear Richard,

and also from the same source,

who was Heppner ?.
 
Many thanks my dear Richard,

and what about Helmuth Hirth,and if he had an aircraft from his creation ?.
 

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Hellmuth Hirth was firstly a chief engineer with the Rumpler company, then by Albatros and since 1914-1915 he worked for Gotha on the giant airplanes. After the ar, he started a Elektronmetall company manufacturing alluminum-magnesium alloy engine and aircraft parts, which also built his only aircaft, all-metal sporting airplane called Spatz, or Sparrow. In 1931, he started the Hirth-Motorem GmbH, which manufactured only engines.
 
Thank you my dear Richard,but the link didn't work.

And who knows that designer, Kaus ?.
 
Thank you my dear Richard,

and what about Keppeler,and his activities post WWI ?.
 
from Lange's book : The 20years old mechanic Ernst Keppeler built in 1928 a monoplane , which crashed at its first flight .
Sp : 7.20m L : 4.50m Empty weight: 130kg

from Flugsport 1928/4 :

Keppeler.jpg
 
Amazing find my dear Richard,

and what about Luftfahrtforschungsanstalt Wien ?.
 
Thank you my dears Richard and Aubi,

and do you know LUWAG ?.
 

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[/QUOTE] I know Martens-Flugzeugbau built MM.3 aircraft,what about MM.1 and MM.2,if they were ever
existed ?[/QUOTE]

The MM 1 "Windhund" was at the Rhön 1924 ... I know nothing about a MM 2 .(only a guess : the improved Windhund ? or the Hans Hückebein I although Bruno Lange names both I & II MM 3)

Numériser.jpg

Before the MM 1 , Martens built motor gliders , the "Max" and "Moritz" single seater , and the very similar "Strolch" two seater

https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=1643

https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=2727
 
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Many thanks,my dears Richard and Maveric,

and this one; Mecklenburgischer Aero-Club ?.
 
and this one; Mecklenburgischer Aero-Club ?.

Three similar gliders M.A.C M I ; M II; M III , and a motor-glider were designed by Paul Krekel (who,after the war designed and built the Krekel "Grille" glider , similar to the M.A.C M I ; M II ; M III)

https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=456
https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=3907
https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=2257

Käfer.jpg
 

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