Curtiss S-3
1917
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Curtiss S-3

Essentially a triplane derivative of the S-2 Wireless (signifying lack of wing bracing wires) unarmed biplane "scout", the S-3, or "Triplane Speed Scout", possessed a similar fuselage and 100hp Curtiss OXX-3 engine, and initially retained the ducted propeller spinner featured by the biplane. Interplane bracing employed "K"-type struts and, on its second flight during the summer of 1917, the S-3 attained an altitude of 5030m, which was a record at the time. For initial trials, the centre wing was attached to the fuselage at low shoulder position, but the gap between all three wings was subsequently increased and the centre wing was raised above the fuselage. After redesign of the rudder and the discarding of the ducted spinner, the S-3 successfully completed evaluation trials and four were ordered during the course of 1917 for the US Army Signal Corps. It was proposed to arm the S-3 with two unsynchronised Lewis guns which were to fire over the propeller arc, but the S-3s were, in the event, delivered to the Signal Corps without armament.

3-View 
Curtiss S-3A three-view drawing (1280 x 984)


Specification 
 WEIGHTS
    Take-off weight599 kg1321 lb
    Empty weight440 kg970 lb
 DIMENSIONS
    Wingspan7.62 m25 ft 0 in
    Length5.94 m20 ft 6 in
    Height2.62 m9 ft 7 in
    Wing area13.25 m2142.62 sq ft
 PERFORMANCE
    Max. speed185 km/h115 mph

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