Eugene Laverty endured a nightmare race day at Donington Park on Sunday.
Starting from twelfth, the Northern Irishman sunk to 15th after a technical problem with his Factory Aprilia in race one, which he then destroyed after a fast fall in race two.
“The crash was the worst possible way to end this weekend,” said Laverty. “After struggling in race one with a technical problem and finishing fifteenth, in the second race I didn't want to lose contact with the lead pack.
“Just as I was pushing hardest I lost the back end, demolishing my RSV4. Physically I'm fine, so all we can do is take a lesson from these problems and get back on track with the next round in America”.