Well, Richard and Joachim, I don´t know why, but I had expected an answer from you first...
The aircraft we were looking for was the
Lohner Type AC.
It was the last Lohner design in the great war and the first one that didn´t had arrowed wings at all. It had the latest Austro-Daimler engine with a power output of 360 hp, as Richard quoted right. While first flown in July 1918 it was not ready for series production until the war ended. But according to Rheinhard Keimel, the second prototype has never been completed.
Here is another view of the machine 10.23:
In early 1919 Leopold Bauer converted the machine into a passenger aircraft by arranging two seats at the position of the observers cockpit. The engine was replaced by a 230 hp Austro-Daimler and some minor changes were done to the tail, radiator installment and others.
It was used first by a courier-service between Vienna and Kamenec-Podolsk (today Ukraine) and later bought by the swiss Alfred Comte. In 1921 the last mention of it was found in press, when Alfred Comte flew some post to Vienna the austrian emperor had left after his return to austria (he fled to Swizerland before war ended). The Interallied Commission tried to confiscate the illegal sold abroad aircraft, but
“the jung pilot was much smarter than the old diplomats and after a truely odyssee he brought the plane home to Swizerland again!”
Cheers
Aquilius