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The duck tail wing is intriguing. Do they still use these on modern 911's?
any pics?
The duck tail arrived on the scene for the 911RS back around 1972. It was featured on the Carreras in the USA in 1974. They were quickly superseded by the whale tail (Carrera 934 RSR) and then the large tea tray spoiler which was enlarged in 1978 to accommodate the intercoolers on the 3.3 litre Turbos. I was always partial to the smaller RSR tails (934) which I had on one of my turbos. The 'duck' tail is popular with many today for retrofitting onto their earlier 911s as they are not as in your face as a whale tail, yet provide the necessary downforce these cars demand.
While living in Europe with a 911S without any sort of tail I ran a considerable risk driving at upper autobahn speeds (above 120) without any sort of tail. These cars are fundamentally unsafe that way. With a tail their stability increases significantly.
If you like Perfection by Design, don't forget to buy Randy Leffingwell's other latest book, Porsche Sixty Years. (Pay special attention to chapter nineteen!) Randy is a friend of mine and does a great job putting these books together.