Lewis Hamilton was the fastest driver in the first practice session in Turkey, setting setting a lap almost a second quicker than team mate Jenson Button.
The two Mercedes were behind them, followed by Sebastian Vettel in the Red Bull.
Red Bull and Force India both ran their version of the F-duct for the first time in 2010.
Onboard cameras suggest Red Bull have a hand-operated device which Vettel tested while Mark Webber drove the standard version of the car.
Adrian Sutil, however, suffered a high-speed crash in his Force India at turn eight three minutes before the chequered flag came out.
The VJM03 speared off the track as he approached the exit of turn eight, making it all the way across the run-off and into the barrier. Sutil was fortunately uninjured.
The first half of the session saw little running as the little-used track was very dusty.
Karun Chandhok had a disrupted sessionafter suffering an electrical problem early on. The marshals waved white flags as the HRT crawled into the pits.
After spending much of the session in the garage he finally made it out 15 minutes from the end of practice to set a time.
Alongside him in the other HRT for this session was reserve driver Sakon Yamamoto, making his first appearance for the Spanish team. Bruno Senna will be back in the car in the second session.
|5||5||Sebastian Vettel||Red Bull-Renault||1’29.867||1.214||30|
|8||6||Mark Webber||Red Bull-Renault||1’30.097||1.444||26|
|10||14||Adrian Sutil||Force India-Mercedes||1’30.501||1.848||17|
|12||15||Vitantonio Liuzzi||Force India-Mercedes||1’30.853||2.200||21|
|14||16||Sebastien Buemi||Toro Rosso-Ferrari||1’31.011||2.358||24|
|15||22||Pedro de la Rosa||Sauber-Ferrari||1’31.238||2.585||18|
|18||17||Jaime Alguersuari||Toro Rosso-Ferrari||1’31.735||3.082||27|
|22||25||Lucas di Grassi||Virgin-Cosworth||1’35.137||6.484||21|
2010 Turkish Grand Prix
- Hamilton’s engineer got it wrong over Button pass, Whitmarsh admits
- Technical review: Turkish Grand Prix
- McLaren told Hamilton Button wouldn’t pass him during the Turkish Grand Prix
- Hamilton praises “incredible development”
- ‘It won’t happen again’ – Webber
- Kobayashi: ‘Q3 means more than a point’
- A brilliant race in Turkey shows F1 is on the right track (Making F1 better)
- Horner blames both drivers for crash
- Renault aiming to beat Mercedes
- 2010 Turkish Grand Prix – the complete F1 Fanatic race weekend review