Tatra 77

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The Czechoslovakian Tatra 77 (T77) is one of the first serial-produced, truly aerodynamically-designed automobiles. It was developed by Hans Ledwinka and Paul Jaray, the Zeppelin aerodynamic engineer. Launched in 1934, the Tatra 77 is a coach-built automobile, constructed on a platform chassis with a pressed box-section steel backbone rather than Tatra's trademark tubular chassis, and is powered by a 60 horsepower (45 kW) rear-mounted 2.97-litre air-cooled V8 engine, in later series increased to a 75 horsepower (56 kW) 3.4-litre engine. It possessed advanced engineering features, such as overhead valves, hemispherical combustion chambers, a dry sump, fully independent suspension, rear swing axles and extensive use of lightweight magnesium alloy for the engine, transmission, suspension and body. The average drag coefficient of a 1:5 model of Tatra 77 was recorded as 0.2455. The later model T77a has a top speed of over 150 km/h (93 mph) due to its advanced aerodynamic design which delivers an exceptionally low drag coefficient of 0.212,[3][4][5][6][7] although some sources claim that this is the coefficient of a 1:5 scale model, not of the car itself.[8][9] Recent article confirmed the Tatra 77/77a drag coefficient for real full-size car as 0.36.[10]

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  • Tatra 77
  • Tatra 77a
Tatra_T_77a.jpg
Overview
ManufacturerTATRA, a. s.
Production
  • 1934-1935 Tatra 77
  • 1935-1938 Tatra 77a
  • 249 produced[1]
    (+ 4 pre-serial in 1933) [2]
AssemblyKopřivnice, Moravia, Czechoslovakia
Designer
Body and chassis
Class4-door sedan
Executive luxury vehicle
Body stylelimousine (Finned fastback, Cd=0.36)
LayoutRR layout
Powertrain
Engine
  • 3.0L Tatra 77 V8 (T77)
  • 3.4L Tatra 77a V8 (T77a)[1]
Transmission4-speed manual[1]
Dimensions
Wheelbase3,150 mm (124.0 in)[1]
Length
  • 5,000–5,200 mm (196.9–204.7 in) (T77)
  • 5,300–5,400 mm (208.7–212.6 in) (T77a)[1]
Width
  • 1,650 mm (65.0 in) (T77)
  • 1,660 mm (65.4 in) (T77a)[1]
Height
  • 1,420–1,500 mm (55.9–59.1 in) (T77)
  • 1,600 mm (63.0 in) (T77a)[1]
Kerb weight
  • 1,700 kg (3,700 lb) (T77)
  • 1,800 kg (4,000 lb) (T77a)[1]
Chronology
PredecessorTatra V570
SuccessorTatra 87
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