Franz Zeno Diemer (1889 in Oberammergau – 1954 in Friedrichshafen) was a flight pioneer in Bavaria, setting a number of world records, and Flight Officer for Bavarian Lifeguard Regiment.
Born in Oberammergau, Bavaria Son of the painter Prof. Michael Zeno Diemer and Frau Diemer Trained as an engineer. 1912 Joined the Bavarian Lifeguard Regiment, then a flying squadron. Was a member of "Bogohl 8 (the bomber squadron operated by the Senior Military Command, with rank of Flying Officer.
01.07.1921 Joined Dornier in Friedrichshafen as test pilot and for trial flying of new aircraft.
1922 After Dornier's move to Marina di Pisa Italy, worked as test pilot, head of the aerodynamics department and manager of the advertising department.
From 1935 on, worked exclusively as manager of the advertising department. Was editor in chief of the company newspaper "Dornier-Post" which appeared from the autumn of 1935 until July 1938.
August 1939 to Ende 1944 : German Air Force..
Returned to Dornier and assumed charge of the suggestions scheme. End of March 1946 retired; ceased to work for Dornier.
Functions at BMW
Test pilot for BMW.
13.09.1919 Set up a world altitude record for a passenger aircraft (8 people on board, 6750 metres) in a Junkers F.13 powered by a BMW IIIa aircraft engine (the pilot, however, may have been Moes). 
BMW test pilot Franz Zeno Diemer took off from the Oberwiesenfeld on 17.06.1919 in a DFW- F 37/III ("C-IV") and captured the first (initially unofficial) world record for BMW by reaching an altitude of 9,760 metres in an aircraft with a BMW IV engine, the successor to the IIIa, reached in 89 minutes. The Treaty of Versailles, signed three weeks later, prohibited Germany from making aircraft and aircraft engines, and all BMW's aero-engine development assets were confiscated by order of the Allied Control Commission.
Later in Life
Died in Friedrichshafen, a town on the northern side of Lake Constance Bodensee in southern Germany, near the borders with Switzerland and Austria.
- BMW Historical Archives