them to twisting and vibration stresses, and then redesigning the parts for manufacture. By August 1953 head engineer Picard had an almond-green prototype delivered to Madrid for dry condition testing, ultimately experiencing only five flat tires and a generator failure after . Subsequently, Lefaucheux ordered engineers to test a Dauphine prototype directly against a Volkswagen Beetle. The engineers determined that noise levels were too high, interior ventilation and door sealing were inadequate and most importantly, the engine capacity was insufficient at only four CV (748 cc). The four-cylinder engine was redesigned to increase its capacity to 845 cc by increasing the bore to 58 mm, giving the car a new informal designation, the 5CV. By 1954 a second series of prototypes incorporated updates, using the older prototypes for crash testing. Lefaucheux followed the testing carefully, often meeting with his engineers for night testing to ensure secrecy, but did not live to see the Dauphine enter production. He was killed in an automobile accident on February 11, 1955, when he lost control of his Renault Frégate on an icy road and was struck on the head by his unsecured luggage as the car rolled over. The Flins factory was renamed in his honor, and he was succeeded on the project by Pierre Dreyfus. By the end of testing, drivers had road tested prototypes in everyday conditions including dry weather and dusty condition testing in Madrid, engine testing in Bayonne, cold testing at the Arctic Circle in Norway, suspension testing in Sicily, weatherseal testing in then-Yugoslavia – a total of more than two million kilometres of road and track testing. In December 1955, Pierre Bonin (director of the Flins Renault Factory) and Fernand Picard presented the first example to leave the factory to Pierre Dreyfus, who had taken over the project after Lefaucheux's death. Debut Renault officially revealed the model's existence to the press through L’Auto Journal and L’Action Automobile et Touristique in November 1955, referring to it simply by its unofficial model designation "the 5CV". Advance press preview testing began on February 4, 1956, under the direction of Renault press secretary Robert Sicot, with six Dauphines shipped to Corsica. Journalists were free to drive anywhere on the island, while under contract not to release publication before the embargo date of March 1, 1956. The Dauphine debuted on March 6, 1956 at Paris' Palais de Chaillot with over twenty thousand people attending,