Williams has removed the exhaust vane that was present on the launch version of its FW35 chassis, with governing body the FIA recently declaring the concept illegal.
The Grove-based squad's latest contender featured a split vane concept inside its exhaust tunnel at last week's penultimate pre-season test in Barcelona, aimed at better directing the airflow over the floor area to further exploit the Coandă effect.
Along with rivals Caterham, which launched its new CT03 with a single exhaust vane, Williams felt certain that its design approach was legal, but the FIA quickly made its stance known and deemed it to be a breach of the technical regulations.
Williams, which ended the opening day of the final test in fourth place with Valtteri Bottas, had previously stated that a change would have little effect on performance.
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| Pos. | Driver | Time | Laps |
|---|---|---|---|
| 1. |  M. Webber | 01:22.693 | 90 |
| 2. | L. Hamilton | 01:24.348 | 113 |
| 3. | J. Vergne | 01:25.017 | 59 |
| 4. | V. Bottas | 01:26.458 | 85 |
| 5. | S. Perez | 01:26.538 | 100 |
| 6. | E. Gutiérrez | 01:26.574 | 91 |
| 7. | P. di Resta | 01:27.107 | 57 |
| 8. | F. Massa | 01:27.541 | 112 |
| 9. | M. Chilton | 01:28.166 | 78 |
| 10. | C. Pic | 01:28.644 | 83 |
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| Williams | |||
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| More Williams photos | |||
| Formula 1 test at Circuit de Catalunya 28 February 2013 | |||
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| More Formula 1 test at Circuit de Catalunya 28 February 2013 photos | |||
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