Note: This engine is located in the Research & Development Gallery on a controlled-access portion of Wright-Patterson Air Force Base. The gallery will close until further notice beginning May 1, 2013, as part of budget reduction requirements due to sequestration.
The Salmson Z-9 engine, rated at 280 hp, was quite unique. Although it was a radial engine, it was cooled by water. The Z-9 was installed in the Salmson 2A.2 airplane, which arrived on the Front early in 1918. The U.S. Air Service purchased 705 Salmson 2A.2s from France and used them to equip many of its observation squadrons.