CARS & HISTORY: TATRA T97 (1936-1939)

In 1936 Tatra built a prototype of a small mid-sized aerodynamic car with an air-cooled engine in the rear. This car was a sort of a small version of the bigger T87, incorporating aerodynamic design with an air-cooled rear-mounted V8. The T97 however had a flat four-cylinder engine with a capacity of 1761 cc in it's tail. The body was smaller then that of the T87, recognisable by two side screens, rear windows, a flat single-piece windscreen and just two headlamps (instead of the T77a's and T87's three). The T97's 1761 cc engine was the world's first air-cooled flat four-cylinder engine with a chain-driven single overhead camshaft per cylinder bank. With a bore x stroke of 75 x 99 mm and a compression ratio of 5,9:1 it developed 29,4 kW (40 HP).
<<< The T97 chassis with rear-mounted air-cooled flat four-cylinder engine (1936) 


<<< The T97 was like a smaller brother to the T87 with two instead of three headlights, a single flat windscreen instead of a three-piece windscreen and two instead of three side windows (1936)


<<< Like the T87 the T97 also featured a tailfin to increase stability, side air scoops and closed rear wheel arches, but instead of the T87's air louvres the T97 had a split rear window (1936)

The T97 was the work of Hans Ledwinka's son Erich, who had followed up Übelacker as chief Tatra car designer in 1936. Erich Ledwinka had already worked on the T87's engine design before starting work on the T97.

<<< T97 publicity shot (1936)

THE VOLKSWAGEN CONNECTION 
It's not difficult to spot the close resemblance between the T97 and the Volkswagen Beetle. That's because their history and development have overlapped. For several years during the 1930s - whilst Tatra was working on the construction of the 1931 and 1933 rear-engined aerodynamic prototypes and Porsche was developing the Volkswagen (VW) KdF-Wagen - Hans Ledwinka and Ferdinand Porsche regulary met to discuss their automotive work and designs. As Porsche later admitted in his own words he occasionally 'looked over the shoulder' of his contemporary.
When the T97 was introduced in 1936 it was perhaps the most advanced small car in the world. But Porsche was still working on the development of the VW KdF-Wagen under an enourmous time pressure from Adolf Hitler, who wanted to use the car for his promotion purposes. Hitler however considered the T97 to be too similar to his KdF-Wagen which was to be produced at the new Volkswagen factory in Wolfsburg, Germany, even though the T97 was listed at more then five and a half times the KdF-Wagen's target selling price. In 1939 Hitler ordered to remove the T97 and the popular T57 from the Berlin Autosalon because of their close resemblance to the KdF-Wagen which was introduced at the 1939 Autosalon.
<<< Ferdinand Porsche (left), Czech Bugatti racing driver Elisabeth Junek (center) & Hans Ledwinka (right) at the Masaryk race (1935)


<<< Tatra V570 prototype (1933), build two years after the first rear-engined Tatra prototype (1931) >>>>>>

Porsche's Type 12 prototype for Zündapp (1932) >>>




<<< Tatra T97 (1936)


KdF-Wagen VW 30 prototype (1937) >>>


In the late 1930s it became clear that VW had used several patents of the Tatra factory. It's likely Porsche used these patents because of the enourmous presure from Hitler to develop the KdF-Wagen in a short time and on a tight budget. Just before the outbrake of WWII Tatra had ten legal claims against VW for infringement of patents. Although Porsche was about to make a settlement with Tatra, Hitler stopped him and told Porsche he would "solve this problem". Shortly after he invaded Czechoslovakia and gained control over the Tatra factory. Hitler immediately stopped the production of the T97 after only 508 cars were built. The T97's big brother, the V8-powered T87, did remain in production during the first years of the war. The T87 was considered by German high command as the ultimate car for the new German Autobahns and was a real favourite amongst German officers.

After the war the KdF-Wagen went on to international stardom as the VW Beetle selling millions and millions of cars, while Tatra found itself stranded behind the iron curtain under a new Communist government who told Tatra what they could and couldn't produce and export. The lawsuit case of the patents was re-opened after the war and dragged on for years, ending in 1961 when VW eventually made a settlement paying Tatra a mere DM 3,000,000.-. Ledwinka never received any money himself and died in relative obscurity in 1967. Porsche later admitted that during the construction of the KdF-Wagen in the 1930s he "occasionally looked over the shoulder of Ledwinka".

More information on the Tatra-VW connection.

For a short time in 1946 there were plans at Tatra to re-introduce the T97. The new Communist Czech government did not approve of these plans however, as the T97 was a very expensive car to produce due to a lot of handcrafted parts. A second plan involved the development of a new luxury car based on the T97 and equipped with a 6-cylinder engine. Although this concept never got any further then a concept, a third plan did reach production. This was a completely new car using the same layout and basis as the T97, but with cheaper components more suited to mass-production: the 1947 T600 Tatraplan.


<<< The pre-WWII T97 (middle) was used as a basis for the post-WWII T107 (left: 1947 prototype; right:1946 Ambroz prototype) and T600 Tatraplan

TATRA T97 PRODUCTION FIGURES

YEAR NUMBER
1937 4
1938 237
1939 269
TOTAL NUMBER 510

TECHNICAL SPECIFICATIONS


TYPE OF CAR TATRA T97

 Air-cooled flat-four engine from the T97 (1936) >>>

Year of production 1936-1939
Number of cars sold 510
Type of engine 4-cylinder petrol engine
Engine cooling air-cooled
Location of engine rear
Bore x stroke 75 x 99 mm
Cylinder capacity 1749 cm³
Compression ratio 5,9:1
Maximal revolutions 3500 rpm
Maximum output 29,4 kW (40HP)
Valve gear OHC
Valves: IO/EO 12º - 15º before TDC

Dashboard of the T97 (1936) >>>

Valves: IC/EC 55º after BDC
Valve clearance 0,15 mm 0,15 mm
Carburettor Zenith 30 IMF
Ignition battery ignition Bosch 12V
Firing order 1, 3, 2, 4
Type of clutch dry one-plate clutch
Gearbox mechanical 4-speed
Number of gears 4 + Reverse
Synchronised gears 3, 4
Gear ratio 1st 1:4,7
Gear ratio 2nd  1:2,95
Gear ratio 3rd 1:1,7
Gear ratio 4th 1:1,08
Gear ratio reverse 1:5,92
Final drive differential 1:3,5
Front axle swinging parrallelogram
Rear axle swinging axles Tatra
Front suspension 2 transversal leafs
Rear suspension 2 semitrailing quartereliptic leafs
Rim size: F/R 16"/16"
Tire size: F/R 5,75 x 16"
Petrol consumption 11 l/100 km
Petrol tank volume 50 l
Oil consumption 0,2 l/100 km
Oil tank volume 6 l
Brakes hydraulic drum brakes all round
Weight of car 1150 kg
Maximum load rating 400 kg
Front track 1250 mm
Rear track 1230 mm
Wheelbase 2600 mm
Overall width 1610 mm
Overall length 4270 mm
Overall heigth 1450 mm
Road clearance 210 mm
Turning circle diameter -
Maximum speed 130 km/h
Maximum climbing ability 30 %
Number of seats 5
Body type berline


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