Question: Who developed the Mercedes-Benz T80 which was intended to break the world land speed record?

Context paragraphs:
Richard Noble: Richard James Anthony Noble, OBE (born 6 March 1946) is a Scottish entrepreneur who was holder of the land speed record between 1983 and 1997.  He was also the project director of ThrustSSC, the vehicle which holds the current land speed record, set at Black Rock Desert, Nevada in 1997.

Bloodhound SSC: Bloodhound SSC is a British supersonic land vehicle currently in development.  Its goal is to match or exceed 1000 mph achieving a new world land speed record.  The pencil-shaped car, powered by a jet engine and a rocket engine is designed to reach 1050 mph .  It is being developed and built with the intention of breaking the land speed record by 33%, the largest ever margin.

Dorothy Levitt: Dorothy Elizabeth Levitt, (born Elizabeth Levi; 5 January 1882, died 17 May 1922) was the first British woman racing driver, holder of the world's first water speed record, the women's world land speed record holder, and an author.  She was a pioneer of female independence and female motoring, and taught Queen Alexandra and the Royal Princesses how to drive.  In 1905 she established the record for the longest drive achieved by a lady driver by driving a De Dion-Bouton from London to Liverpool and back over two days, receiving the soubriquets in the press of the Fastest Girl on Earth, and the Champion Lady Motorist of the World.

Golden Arrow (car): Golden Arrow was a land speed record racer built in Britain to regain the world land speed record from USA.  Henry Segrave drove the car at Daytona Beach and exceeded the previous record by 24 mph or 39 km/h.

Mercedes-Benz T80: The Mercedes-Benz T80 was a six-wheeled vehicle built by Mercedes-Benz, developed and designed by Ferdinand Porsche.  It was intended to break the world land speed record, but never made the attempt, having been over-taken by the outbreak of World War II.

Art Arfons: Arthur Eugene "Art" Arfons (February 3, 1926 – December 3, 2007) was the world land speed record holder three times from 1964 to 1965 with his "Green Monster" series of jet-powered cars, after a series of "Green Monster" piston-engine and jet-engined dragsters.  He subsequently went on to field a succession of "Green Monster" turbine-engined pulling tractors, before returning to land speed record racing.  He was announced as a 2008 inductee in the International Motorsports Hall of Fame three days after his death.

Aston Martin RHAM/1: The Aston Martin RHAM/1 was a highly modified Aston Martin DBS V8 racing car, developed by Robin Hamilton, built with the intention of racing at the 24 Hours of Le Mans.  After development by Hamilton, RHAM/1 competed in the 1977 and 1979 24 Hours of Le Mans, finishing 17th overall and 3rd in the GTP class in the 1977 race.  The car has also held the World Land Speed Record, for towing a caravan, at the speed of 124.91 mph.

Ernest Eldridge: Ernest Arthur Douglas Eldridge (18 July 1897 – 27 October 1937) was a British racing car driver who broke the world land speed record in 1924.  His was the last land speed record set on an open road.

Aero-engined car: An aero-engined car is an automobile powered by an engine designed for aircraft use.  Most such cars have been built for racing, and many have attempted to set world land speed records.  While the practice of fitting cars with aircraft engines predates World War I by a few years, it was most popular in the interwar period between the world wars when military-surplus aircraft engines were readily available and used to power numerous high-performance racing cars.  Initially powered by piston aircraft engines, a number of post-World War II aero-engined cars have been powered by aviation turbine and jet engines instead.  Piston-engined, turbine-engined, and jet-engined cars have all set world land speed records.  There have also been some non-racing automotive applications for aircraft engines, including production vehicles such as the Tucker 48 and prototypes such as the Chrysler Turbine Car, Fiat Turbina, and General Motors Firebirds.  In the late 20th century and into the 21st century, there has also been a revival of interest in piston-powered aero-engined racing cars.

Land speed record: The land speed record (or absolute land speed record) is the highest speed achieved by a person using a vehicle on land.  There is no single body for validation and regulation; in practice the Category C ("Special Vehicles") flying start regulations are used, officiated by regional or national organizations under the auspices of the Fédération Internationale de l'Automobile.  The land speed record (LSR) is standardized as the speed over a course of fixed length, averaged over two runs (commonly called "passes").  Two runs are required in opposite directions within one hour, and a new record mark must exceed the previous one by at least one percent to be validated.

Supporting paragraphs: Mercedes-Benz T80 Land speed record
Answer: Ferdinand Porsche