Model Variants (Including Prototypes)
S.XV - Base Series Designation
S.XV/1 - Initial prototype of July 1917; large spinner at propeller hub.
S.XV/2 - Revised wings and tailplanes; revised engine installation; sans spinner; model of mid-1917.
S.XV/3 - Lengthened fuselage; model of early-1918.
S.XV/4 - Fitted with Rhone engine of 170/180 horsepower; abandoned development of 1918.
S.XV/5 - Pair of modified post-war S.XV for air-racing; two-seater with Le Rhone engines of 80 horsepower.