The original intention was to fit the mystery aeroplane with a 200 h.p. Clerget 11E . As this engine was then only at a prototype stage (it was never a success in any event) the next scheme was apparently to fit a 160 h.p. Gnome Monosoupape 9Nc.
In the event the aircraft was eventually (under)powered by a Clerget 140 h.p. 9Bf.
Schemes existed to power developments of this aircraft by 250 and even 300h.p. twin row Clerget engines. These however, like the engines, didn't come to anything definitive.