According to “The Osprey Encyclopedia of Russian Aircraft 1875 – 1995” (by Bill Gunston), p278, ‘several’ Stal-3 were equipped with the M-17 engine, a license product of the BMW VI water cooled V-12-engine.
According to “French Aircraft of the First World War” (Davila/Soltan, p.570) the left one is a Voisin Type M of 1916,
the right one a Voisin Type O (two Ms joined at the wings).
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