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Hmmm, no other entries after 12 hours...
Marek, you are not far from the goal!
Just there is something missing till now.
It is not the 1911 Harlan.
And the type briefly flew in 1914.
(but you are right, it is a pre-war design)
I will come back to the records later, but I have to ask where you get your notes from?
When did Grulich flew 10 hours?
Following Günther Schmitt, the time record with pilot only was 5:10 h on December 12th 1912, set by Alfred Friedrich and Felix Laitsch flew 9:23 h on Oktober 28th 1913.
The "National Week" you mentioned was the "Nationale Flugwoche" in June 1911, when Grulich won the highest price? There have been two earlier ones in August and Oktober 1910, but Karl Grulich didn't took part then.
The achievements of the aircraft I'm looking for where reached by other pilots.
Aquilius
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