Accordind to the United States Airforce Museum and American Aviation Historical Society, Santa-Ana, California, this in not the true Nieubort 28 plane engine which was powered by an 150 HP Gnome Monosoupape 9N Rotary Engine. The relic is an Hispano-Suiza Engine.
There is a plate to explain that this is not the Quentin Roosevelt aircraft, the engine is displayed to represent the spirit of Americans pilots at that time and to honors their memories.