Mercedes-Benz T80 – World Record Project Car
The Mercedes-Benz T80 was a six-wheeled vehicle built by Mercedes-Benz, developed and designed by Ferdinand Porsche
by Thomas Philips | 13 July 2018
German auto racer Hans Stuck had a dream and a desire to capture the world land speed record for himself and for Germany. In the late 1930s, he worked to put together a team to achieve this goal and in 1937 had convinced Wilhelm Kissel, Chairman of Daimler-Benz AG, to have Mercedes-Benz develop and build the vehicle, which Dr. Ferdinand Porsche had agreed to design. Stuck also obtained project approval from Adolf Hitler, who saw the record as another propaganda tool to demonstrate Germany’s supposed technological superiority.
The vehicle was officially known as the Mercedes-Benz T80 or Type 80. Dr. Porsche had first targeted a speed of 342 mph (550 km/h), utilizing a 2,000 hp (1,490 kW) engine. However, other speed record challengers began to raise the record, so the T80’s speed goal was raised as well. More power was made available from the engine, and when the T80 was nearly finished in 1939, the target speed for its record run was 373 mph (600 km/h) after 3.7 mi (6 km) of acceleration.
The T80 cost 600,000 Reichsmarks to complete; that is about $4 million in today’s USD. Aerodynamics specialist Josef Mikcl helped streamline the car’s body, which was built by aircraft manufacturer Heinkel Flugzeugwerke. The T80 incorporated a Porsche-designed enclosed cockpit, low sloping hood, and rounded fenders. The rear wheels were encased in elongated tail fins to help stabilize the vehicle at speed. Two small wings at the middle of the car provided downforce and ensured stability. The heavily streamlined twin-tailed body achieved a drag coefficient of 0.18, a very low figure even by today’s standards.
The car had three axles: the front provided steering, and the two rear axles were driven by a 2,717 cu in (44.5 L) Daimler-Benz DB 603 inverted V-12 aircraft engine. Ernst Udet, director of Germany’s Aircraft Procurement and Supply, provided the third DB 603 prototype engine for installation in the T80. The supercharged DB 603 engine with mechanical fuel injection was specially tuned to 3,000 hp (2,240 kW). The engine ran on a special mixture of methyl alcohol (63%), benzene (16%), ethanol (12%), acetone (4.4%), nitrobenzene (2.2%), avgas (2%), and ether (0.4%); it utilized MW (methanol-water) injection for charge cooling and anti-detonation.
Power from the engine was transmitted to the four drive wheels via a hydraulic torque converter to a single-speed final drive. To maintain traction, the T80 had a mechanical “anti-spin control” device. The front and rear wheels each had a sensor to mechanically detect wheel spin. If the rear wheels began to spin faster than the front, fuel to the engine was automatically reduced.
The T80 was 26 ft 8 in (8.128 m) long and 4 ft 1 in (1.245 m) tall. Its body width was 5 ft 9 in (1.753 m) and 10 ft 6 in (3.20 m) wide including the wings. All six wheels were 7 in x 32 in and had a 4 ft 3 in (1.295 m) track. The vehicle weighed about 6,390 lb (2,900 kg).
The T80 vehicle had been unofficially nicknamed Schwarzer Vogel (Black Bird) by Hitler and was to be painted in German nationalistic colors complete with German Eagle and Swastika. Hans Stuck would have driven the T80 over a special stretch of the Dessau Autobahn (now part of the modern A9 Autobahn), which was 82 ft (25 m) wide and 6.2 mi (10 km) long with the median paved over. The record attempt was set for January 1940 and would have been the first absolute land speed record attempt in Germany.
However, the outbreak of the war prevented the T80 run. In fact, the vehicle’s finishing touches were never completed, and it never moved under its own power. After the record attempt was cancelled, the T80 was garaged. In late February 1940, the DB 603 engine was removed, and the vehicle was stored in Karnten, Austria for the duration of the war. The Mercedes-Benz T80 was unknown outside of Germany until discovered by the Allies after World War II. Fortunately, the T80 survived the war relatively unscathed and was eventually moved into the Mercedes-Benz Museum in Stuttgart, where it is on permanent display in the Silver Arrows – Races & Records Legend room. (The T80’s body is on display. The chassis is in storage at a museum warehouse.)
On 16 September 1947, John Cobb achieved 394.19 mph (634.39 km/h) in the twin Napier Lion-powered Railton Mobil Special, surpassing the T80’s calculated Autobahn record run speed. However, after discovering the T80, the Allies had been quoted an astounding top speed of 465 mph (750 km/h) for the T80. Had the T80 been capable of this estimated top speed, the corresponding record would have been unequaled until 1964 when Craig Breedlove hit 468.72 mph (754.33 km/h) in the jet-powered Spirit of America. In addition, the T80 would still hold the record for the fastest piston-engined, wheel-driven vehicle.
OFFICIAL PRESS RELEASE
The Mercedes-Benz T 80 world record project car was the brainchild of racing driver Hans Stuck: he wanted to break the absolute world land speed record. Stuck completed the project with the help of three major personalities: Wilhelm Kissel, the Chairman of the Board of Management of Daimler-Benz AG, engineer Ferdinand Porsche and air force general Ernst Udet. During the 1930s each of them made their contribution to completion of the project. The story of the Mercedes-Benz T 80 is a marathon for the designers and aerodynamicists: the project began in 1936. Via numerous development stages and vehicle refinements, it came to an end in 1940 – without the T 80 ever being used.
The aim of all those involved was to achieve a speed never before reached by any land vehicle. This was all the more challenging because, in that period, British drivers were establishing new records all the time at Daytona Beach and on the Bonneville Salt Flats: on 3 September 1935, Malcolm Campbell reached a speed of 484.62 km/h over the flying mile with “Blue Bird”. On 19 November 1937, George Eyston broke the 500 km/h barrier with “Thunderbolt” (502.11 km/h over the flying kilometre). And finally on 23 August 1939, John Cobb established a new record of 595.04 km/h over the flying kilometre with “Railton Special”. Accordingly the planned target speed of 550 km/h was revised upwards, first to 600 km/h and finally even to 650 km/h.
A new record for the Silver Arrows
If this project proved successful, Mercedes-Benz would add another triumph to a long list of speed records. The highlight to date was the speed record on public roads established by Rudolf Caracciola on 28 January 1938: he reached a speed of 432.7 km/h with the record-breaking Mercedes-Benz W 125 on the autobahn near Darmstadt. Nevertheless, the T 80 project was not without its critics within the company. This was not least due to Hans Stuck himself. After all, the Grand Prix racing driver competed for Auto Union in the 1930s. How would the public respond if the highly successful Stuttgart racing department engaged a driver from the competition for its absolute world record attempt? Many decision-makers in the company therefore wondered if it would not be better to entrust works driver Rudolf Caracciola with the record-breaking attempt as previously.
On the other hand, Stuck also had connections with the Stuttgart brand: in 1931 and 1932, driving a Mercedes-Benz SSKL, he raced very successfully for the Mercedes star. In 1932 he became international Alpine champion and Brazilian hill-racing champion. Four years later, Stuck was now using his former contacts with Untertürkheim.
Via the racing department of Auto Union, he made contact with designer Ferdinand Porsche. It was on the latter’s P-vehicle concept that the Grand Prix racing cars of Auto Union were based from 1934 to 1936. And flying ace Ernst Udet had already known Stuck since the 1920s. At that time the two would spar off, e.g. in ice races on the frozen Lake Eib near Garmisch-Partenkirchen: Stuck driving an Austro Daimler racing car and Udet flying an aircraft.
Telegram to Stuttgart
What was the motivation for Stuck’s desire to break the absolute world land speed record? One reason was undoubtedly his Auto Union team mate Bernd Rosemeyer. When the latter won the European Grand Prix championship in 1936, Hans Stuck started looking for another stage on which to demonstrate his driving skills. An obvious possibility was the world record, which was dominated by British drivers at the time.
Stuck had contacts in the National Socialist government, and knew that he could rely on political support for this prestige project. Nonetheless, he also needed partners for its technical implementation. On 14 August 1936 he sent a telegram from Pescara to the Chairman of the Board of Management of Daimler-Benz, Wilhelm Kissel, requesting a meeting. In a conversation with Kissel, the racing driver suggested that Mercedes-Benz should build a record-breaking vehicle powered by a Daimler-Benz aircraft engine. The British record-breaking cars of that era were also powered by aircraft engines.
Record-breaking attempts were not new territory for Mercedes-Benz. After all, the Stuttgart-based company had set numerous records in the 1930s. And as Kissel remembered, the idea of building a record-breaking vehicle powered by an in-house aircraft engine had already come up under the aegis of late Daimler-Benz board member Hans Nibel, who died in 1934.
The vehicle for the record attempt was to be designed by Ferdinand Porsche, who had left his position as Chief Engineer at Mercedes-Benz in 1928. However, there were still connections between the world’s oldest automobile manufacturer and the Porsche design studio (P.K.B.). Between 1936 and 1937 Mercedes-Benz, among other things, built 30 prototypes of the “KdF” car, which went into series production as the VW Beetle after the Second World War.
On 11 March 1937, Dr. Ing. h.c. F. Porsche GmbH concluded a contract with Daimler-Benz AG for extensive involvement in all areas of engine and vehicle design. As well as the T 80 (according to Porsche nomenclature, the “T” stood for “type”), the resulting projects included the T 90, T 93, T 94, T 95, T 97, T 104 and T 108. So, in addition to the world record project vehicle, Porsche was also involved in developing racing cars, commercial vehicles and engines.
An aircraft engine for a world record
The T 80 was to be powered by a Daimler-Benz aircraft engine. However, the manufacturer did not have automatic access to such a unit, as the Ministry of Aviation had sole rights of disposal over all aircraft engines produced in Germany. Therefore, Stuck put his connection with Ernst Udet to good use. The flying ace had meanwhile been promoted to head of the Luftwaffe’s technical department.
Fritz Nallinger, at that time Daimler-Benz’s technical director responsible for the design, development and production of large engines, commented on the project in September 1936. In Nallinger’s estimation, an output of 1,103 kW (1,500 hp) with the initially proposed DB 601 aircraft engine was definitely possible. In fact, 2,036 kW(2,770 hp) was achieved with a version of this engine prepared for flying record attempts in 1938 and 1939.
In October 1936 Kissel informed Porsche by telephone that the Ministry of Aviation was willing to release two engines. He also asked Porsche to commence work on the project. The official order followed on 13 January 1937. An appendix to the order pointed out that the Porsche design was always only to be referred to as a Mercedes-Benz world record project vehicle.
The financing was initially arranged as follows: Daimler-Benz would bear the cost of building the chassis. The body was to be built and paid for by aircraft manufacturer Heinkel. Organisation of the record-breaking attempt itself would be financed by racing driver Stuck himself. This had already been laid down by Kissel when he met with Stuck on 21 October 1936. In November 1936 Kissel estimated that the T 80 could not be completed before October 1937.
In February 1937, the project took a major step forward when Ernst Udet approved the official release of the DB 601 aircraft engine for installation in the T 80. In view of the greater power requirement that became obvious during the course of development, this approval was later extended to the DB 603 V3.
On 6 April Porsche presented his plans for the T 80 in Untertürkheim. These describe a multistage development process, from an initial twin engine proposal to a final single engine concept. This latest proposal already showed most of the characteristics of the vehicle actually built: a three-axle record-breaking car powered by a centrally suspended V12 aircraft engine. Porsche calculated that for a record speed of 550 km/h after a distance of five kilometres, an engine output of at least 1,618 kW (2,200 hp) or better still 1,838 kW (2,500 hp) would be necessary.
Originally the plan was to use a track in the United States of America for the record-breaking attempts. In mid-1938 this gave way to a plan to use a specially prepared section of the autobahn between Dessau-South and Bitterfeld instead. In August 1938 the General Inspector of German Roads, Fritz Todt, announced that the date for the proposed release of this autobahn section for use would be in October 1938.
The question of the location for the record attempt was never actually settled. But there was still talk of a record attempt in the USA in 1939. All the world speed records of recent years had been achieved on the Bonneville Salt Flats in the USA. One reason for the renewed discussion at Mercedes-Benz might have been the difficult driving conditions on the manually paved median between the two lanes on the envisaged section of the autobahn.
The birth of the world record car
The T 80 increasingly took shape during the course of 1938. In October Ferdinand Porsche viewed the wooden model of the bodyshell together with employees. It was now time to define the types of steel panelling for the body and produce a corresponding bill of materials, decide on the details of the seat and cockpit and formulate the tubular structure of the spaceframe. On 26 October 1938, the Mercedes-Benz racing department recorded in a test report that the first welded frame weighed 224 kilograms.
The chassis and frame were completed at the end of November 1938. The Mercedes-Benz racing department planned that the vehicle complete with all its major assemblies would be ready by the end of January 1939. A memo dated 26 November 1938 states that if the aircraft engine could also be delivered by then, the chassis could be assembled by the end of February 1939. The body would then be completed by May 1939.
Will the tyres withstand the record-breaking speed?
Tyre manufacturer Continental tested the wheels intended for the T 80 on a test stand, and during a high-speed test at 500 km/h in January 1939 found severe deformation of the wire-spoked wheels supplied by Hering in Ronneburg (Thuringia). In May there were still slight deformations at 480 km/h. Porsche had meanwhile calculated that a distance between 13.73 kilometres (with 2,023 kW/2,750 hp) and 11.48 kilometres (with 2,206 kW/3,000 hp) would be necessary for a record-breaking run at 600 km/h.
In 1939 the decision was reached to equip the T 80 with a DB 603 engine. In March 1937 the Ministry of Aviation had forbidden its further development as an aircraft engine, but it could be used for the land speed record if the ministry approved. The engineers were confident that the 44.5-litre V12 aircraft engine designed for an output of around 1,471 kW (2,000 hp) could reach up to 2,206 kW (3,000 hp) at 3,200 rpm during a record-breaking attempt. To this end the engine was to be fuelled with the two special racing fuels XM and WW. From February 1940 the company was permitted to restart its work on the DB 603 as an aircraft engine. Series production for aviation use began in 1941.
Optimisation of the DB 603 for the record attempt
In 1939 racing manager Alfred Neubauer noted down that a DB 603 for the T 80 could be delivered as a “running-in engine” in June of that year. The engine to be used in the actual record attempt would be available at the end of August 1939. In June Fritz Nallinger, who was responsible for Daimler-Benz aircraft engines, improved various details for installation of the world record project engine in the T 80. This included modifying the routing of the air intake ducts and configuring the exhaust ducts so that the vehicle could convert recoil energy into speed.
In summer 1939 measurements on a scale model of the T 80 were also carried out in the wind tunnel of the Zeppelin company in Friedrichshafen. The aim was to find the optimum level of downforce: strong enough to bring the entire engine power onto the road, but as low as possible so as not to overload the tyres with their thin tread surfaces. Following these measurements, the surface area of the downforce fins was reduced by another 3.65 square metres.
Testing of the T 80 was also continued after the outbreak of the Second World War on 1 September 1939. On 12 October the chassis of the world record project car was tested on the roller dynamometer, for example. In view of the new record of almost 600 km/h set by Cobb, Porsche was meanwhile envisaging a speed of up to 650 km/h for the record-breaking attempt. This would probably make an engine output of up to 2,574 kW(3,500 hp) necessary. Even this level of power seemed possible with the DB 603.
End of the T 80 project in spring 1940
No further steps were taken towards achieving the world land speed record. As early as February 1940, Mercedes-Benz sent an enquiry to the Ministry of Aviation about a possible contribution towards the development and production costs. In June 1940 a final report was produced for the project, and the T 80 was placed in storage. The DB 603 world record project engine meanwhile installed in the vehicle was returned to the Ministry of Aviation.
After the Second World War, Mercedes-Benz exhibited the T 80 in the company’s museum in Untertürkheim. When the museum was reorganised in 1986, the body and chassis were separated and the chassis was placed in storage. The new Mercedes-Benz Museum opened in 2006 outside the gates of the Untertürkheim plant also presented the T 80 in the permanent exhibition with its original body, spaceframe and wheels – but without the heavy chassis.
The body exhibited in the Mercedes-Benz Museum intentionally shows the world record project car with traces of the project work which was unfinished in 1940. Mercedes-Benz Classic is now juxtaposing the chassis together with the replicated spaceframe and the cutaway engine with this mighty exhibit. From mid-2018 this unique exhibit will make the technology of the T 80 immediately and impressively accessible.