Nick Heidfeld admitted he simply made driving mistakes after crashing twice during Friday practice in China.
The Renault driver damaged his front wing after going off track at Turn 10 during first practice, and then again after skidding off at Turn 13 in the second session. The German admitted he was just trying too hard.
"It was a driving mistake. I went off twice and that can happen – I just went over the limit," said Heidfeld. "I was in a very good mood until I crashed into the tires. I have been around for a while but I cannot remember crashing twice in one day, so that was not a good start."
He added: "It was just my mistake. These things, unfortunately, can happen, I think a lot of other people also went off a bit and had spins. Unfortunately, I destroyed two wings, it shows it isn't easy today but it is not meant to be an excuse. I just f****ed up!"
Heidfeld was forced to revert to the preview spec front wing following his crash, as the team had only one available.
"There was only one, so even after the first crash I was back to the old spec, which is not as good as the one I have now but it should still be good enough to have a good performance."
The Renault driver admitted he was still encouraged by the pace of his car, especially in first practice, and reckons there is more to come from the team.
"I was quite positive about it after P1 because I did two timed lap and I ended up in P5. Unfortunately, in the second session, it didn't look quite as good. I did a few more laps and ended up in eighth position. There was a gap to some of the cars in front which I would have liked to have been a bit smaller.
"I am convinced that there is more to come from us because I went out after I crashed, took it a bit easy in the first two or three corners, but saying that most of the others will also tell you that this lap was not perfect, there is more to come, so let's see tomorrow."