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S-35 - Mono-biplace pursuit, 180 h.p. Hispano. 
S-37 - Four-place transport, 275 h.p. Hispano (September 9, 1920.)
S-20 5 bis - Monocoque special, Gordon-Bennett, 300 h.p. Hispano (September 22, 1920.)
S-20 bis 6 - Monocoque, record speed (special profile, 320 h.p. Hispano (October 6, 1920.)
Of these types the most notable are the Spad 20, the Spad 20 mis and the Spad 34 and 35.

SPAD 20 TWO-SEATER PURSUIT.

The Spad is the 300 horsepower Hispano motored, two-place, and was designed in 1918 by Mr. Herbemont. 
Characteristics:
Motor, 300 h.p. Hispano, radiator, nose-type. 
Gasoline tanks: one under pilot's seat and two gravity tanks on the upper wings.
Over-all length ---------- 7 m. 30
Height ------------------- 2 m. 8
Wing span, upper --------- 9 m. 72
Wing span, lower --------- 8 m. 69
Chord, upper ------------- 1 m. 75
Chord, lower ------------- 1 m. 65
Gap, at center ----------- 1 m. 65
Gap, at ends ------------- 1 m. 55
Total area --------------- 30 sq. m.
Weight, loaded, per sq. m. 43.7 kgs.
Weight, per hp. ---------- 4.4 kgs.
Endurance, at 3,000 meters 3 hrs. 

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