Kees, I also wondered why A. Waldis & O. Britschgi did not mention this machine and it's designer.
But the only two chapters about flyers from Luzern were named:
• Erfolglose Luzerner Flugpioniere (unsuccesful aviation pioneers)
• Die ersten Luzerner mit Flugbrevets (first Lucerne's with pilot brevets)
Both was not the case with our man.
They obviously missed a chapter!
Or does someone know where I can find the list of breveted swiss pilots?
But I'm not sure if the monoplane was flown in the area of Lucerne. The picture is held by the technical school of Zürich and it might have been in Thun too. There it probably did not fly in 1915.
But you are right, the flying in 1915 is somewhat questionable.
To the moment I can't say where I have that note from. Just it tells after many successful flights and various tests with that machine it has been sold in 1914 - to Dehan??? - and was flown later on.
Cheers
Aquilius