when did Porsche go ducktail to whaletail

[abc123]

was the ducktail offered as a factory? option what years? when did the whaletail come into play

[Peter Zimmermann]

If I had to guess, I'd say that the first use of a street whale tail was on the extremely rare '74 RS 3.0, but for general use I'd say that the '75 Carrera was the "earliest" production application. The street '74 Carrera was fitted with the last ducktail. I think...

[JeremyD]

RSR - IROC

Donahue tested with the duck - First IROC cars were with the duck -

Did some more testing and determined the IROC tails gave more downforce - so switched before the first race...

[Bill Verburg]

Originally Posted by JeremyD

RSR - IROC

Donahue tested with the duck - First IROC cars were with the duck -

Did some more testing and determined the IROC tails gave more downforce - so switched before the first race...

The 15 IROC RSR's delivered to Mark Donahue in Oct '73 were all equipped w/ Burzell(Ductail) spoilers, Donahue changed them to the more effective Carrera 3.0RS long whaletail. Other than that they were '73RSR spec w/ the recently introduced G series short hood/ big bumper look.

The 56 MY74 Carrera 3.0RS were the first factory 'street' cars delivered w/ a whale tale. In fact they came w/ 2 different whale tales a short street version w/ rubber lip and no cooling slot and a long all /f/g version w/ cooling slot for track use.

The tails were developed in house during the spring and summer of '73 for use on the '74 RSRs but were released to Donahue for use on the IROCs and for use on the street legal C3RS

The '74 3.0RSR was the first race car to use the whale tale, the long version w/ a cooling slot was used on these