{{Single source|date=December 2018}} {{Infobox automobile |name = NW Type S (18/24, 16/20)<br>Type S4 (20/30)<br>Type S6 (40/50) |manufacturer = Nesselsdorfer Wagenbau-Fabriks-Gesellschaft A.G. (now known as Tatra) |production = '''S (18/24, 16/20):''' 1906–1912 '''S4 (20/30):''' 1913–1917<br>(62 produced) '''S6 (40/50):''' 1912–1915<br>(12 produced) |assembly = Kopřivnice, Moravia |predecessor = |successor = NW T (S4)<br>NW U (S6) |image = Nesselsdorf S.jpg |class = |platform = |transmission = 4-speed manual |layout = Front-engine, rear-wheel-drive layout |body_style = Diverse four- or six-seaters |engine = {{ubl | {{cvt|3306|cc|L|1|disp=flip}} I4 (S/S4) | {{cvt|4959|cc|L|1|disp=flip}} I6 (S6) }} |wheelbase = {{ubl | '''S (18/24, 16/20):''' | {{cvt|2900|mm|in|1}} | {{cvt|3000|mm|in|1}} | {{cvt|3100|mm|in|1}} | {{cvt|3400|mm|in|1}} | '''S4 (20/30):''' | {{cvt|3100|mm|in|1}} | '''S6:''' | {{cvt|3450|mm|in|1}} }} |length = |width = |height = |weight = {{cvt|1172|kg|lb}} - {{cvt|1290|kg|lb}}<br>(S/S4, depending on bodywork<ref name="ReferenceRosenkranz">Tatra - Passenger Cars, Karel Rosenkranz, TATRA, a. s., 2007</ref>)<br>{{cvt|1800|kg|lb}}<br>(S6, depending on version<ref name="ReferenceRosenkranz"/>) |designer= Hans Ledwinka }}
The '''NW type S''' was a series of large automobiles manufactured by Nesselsdorfer Wagenbau-Fabriks-Gesellschaft A.G. ('''NW''', now known as '''Tatra'''), in Moravia, in what was then Austria-Hungary.
Hans Ledwinka, who left the company in 1902, was hired back in 1905. Immediately, he started working on a new car with a modern and progressive design. Some of the new features included overhead valves, actuated by overhead camshaft (OHC), and hemispherical combustion chamber. The water-cooled engine was mounted at three points and the engine block had large service access doors. The engine and the gearbox formed one unit, the monoblock.<ref name="ReferenceRosenkranz"/>
The gearbox itself was of a bell shape with only five gears. Two of the gears were ring type with teeth on the inside surface. Individual speeds were engaged by moving the gears radially. The rear axle was driven by a drive shaft in lieu of chains.<ref name="ReferenceRosenkranz"/>
The S4 and S6 with four- and six-cylinder engines, respectively, were able to reach maximum speeds of 80 km/h and 100 km/h (50/62 mph). The S 18/24 and 16/20 models developed {{cvt|20|PS|kW|1}}, while the S4 20/30 offered {{cvt|30|PS|kW|1}}. The later, six-cylinder S6 40/50 version was an S4 with two cylinders added; it produced {{cvt|50|PS|kW|1}} and was introduced in 1910. The total production of both models was 74 units.<ref name="ReferenceRosenkranz"/>
==References== {{reflist}}
{{Tatra models}}
Category:Cars of the Czech Republic Category:Tatra vehicles Category:Rear-wheel-drive vehicles Category:Cars introduced in 1906 Category:Cars discontinued in 1917
{{Brass-auto-stub}}