not to sure on impact speed but he was excelerating down the hill when it went out of shape. mid way through 4th then straight off. gravel didnt really seem to slow us down as we sort of skimmed over the top of it.
was a hard impact. really took the wind out of us both. as soon as we got out the car we just sat on the tyre wall groaning trying to get a breath lol
funny thinking about it now. both just perched on the wall looking at the car like a couple of wheazing old smokers.