Model Variants (Including Prototypes)
S.XX - Base Series Models; 95 completed.
S.XX bis - Improved S.XX with larger wing surfaces; improved control; 2 examples.
S.20 bis-1 - Standard racer model
S.20 bis-2 - Racer with shortened wing appendages.
S.20 bis-3 - Racer with revised, shortened wings
S.20 bis-4 - Racer with revised, shortened wings
S.20 bis-5 - Gordon Bennett racer; revised wings; two examples completed.
S.20 bis-6 - Racer model with special Hispano-Suiza engine installation.