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Introduction

	Porsche Type 718 includes the models that descended from the 550. These cars have much nicer lines and start with the Type 718 RSK which first appeared in 1957. It had the same wheelbase as the 550A but a lower body. The earliest versions had vertical fins on the rear fenders when they were raced by the factory. This program developed the RS60 and RS61, and some Formula 2 cars which started with a center seat version of the RSK and eventually open wheel race cars.
	Porsche RS61 The successor to the RSK were the RS60 and RS61, design changes following new rules by the FIA, Appendix C (Sports Cars) to bring them closer to Appendix J (Grand Touring Cars).Changes including making the windshield higher, doors had to be bigger and there had to be room for a suitcase. The wheel base was lengthened 4 inches and the cockpit width increased. Thanks to smaller wheels and tires, the weight was about the same as the RSK, 1280 lbs with fuel. The price factory delivered price was ,000. An RS60 won at Sebring and the Targa Florio and placed 11th at Le Mans in 1960, nearly winning the manufacturers championship after tieing in the points total. In 1961 the name was changed to RS61 and continued to be produced. Here is Serial number 718-068, now based in Northern California.
	Porsche Carrera 6 Debuting at Daytona with a class win and 6th overall in 1966, the Porsche type 906 was a new direction in sports racing cars under the direction of 29 year old Ferdinand Piëch, nephew of Ferry Porsche. At the introduction in Daytona the Carrera created a sensation. It was very low, 39 inches, compared to the contemporaries. It was "shaped from the inside by the regulations and from the outside by the wind". The 906 designation was interesting as the last of the 904s were of type 906. The Carrera 6 serial numbers started with 906-101. About 72 were built.
	Porsche 910 The Porsche 910 designation is interesting because it is out of sequence with the other racing cars of the period, fit between the 906 and 907. The original 910 was a Bergspyder - a hill climb car - that was a revision of the 906 and the model designation probably came from the Olion-Villars car chassis #906-010. The cars were highly successful on the European hill climb circuit in 1966. From 1967 through 1969 the 25 Hours of Le Mans was host to a series of 910s with 6 cylinder 2.0 liter 901 engines and 8 cylinder 2.5 liter engines. The cars were lighter than the 906 by over 140 pounds with dry weights of 1200 lbs. The body shape was tested in the wind tunnel.
	Porsche 956/962 The 956 was designed to meet the 1982 FIA requirements for Le Mans which placed a limitation on fuel economy for its Group C cars. There were no minimum production requirements or engine type or capacity. This was ideal for Porsche which had always done well in the index of performance category. Maximum tank capacity was 100 liters and cars would only be allowed 5 stops in the course of a 1000 K or 6 hour race and 25 stops in a 24 hour race. A minimum weight of 1,764 lbs, outside dimensions and safety requirements were also mandated. The 956 was built to the limit of the regulations, with the longest wheelbase ever seen on a Porsche. It was designed with aide of a wind tunnel with special attention to airflow under the car emphasizing down force.