A friend of Doug's was on a road ride with someone who sucked a squirrel into his front fork resulting in the fork arm shearing off and causing him to crash catastrophically.
Here's the story posed in a question (I believe) to a carbon fork manufacturer:
"Two weekends ago a riding buddy's brother was eight miles in to a century when he sucked a squirrel in to his front wheel while traveling at a good 25-30 mph. He fractured his #10 thoracic vertebrae, but there was no spinal cord damage, so he will recover, albeit with some new and permanent internal hardware.
From what we can surmise, the squirrel got in the wheel and sheared the fork in half. The big chainring is bent, so it appears he came down on on the ring and then on to his right side, hard enough to damage the shifter, but not bend the bars.
We were all just surprised that a squirrel could shear a fork in half like that. Have you ever seen something like that happen before? I would have expected the wheel to just lock up, but I guess at 25-30 mph the force must be a lot more than I would have guessed, and as I understand it, carbon fiber does not do well under compression/impact. And the squirrel does appear to have hit the fork dead center — at the point of highest leverage.Any thoughts?"
Here's the response:
"I have seen this before — not in person but in photos people have sent me of dead squirrels and sheared-off carbon forks. The rider would be just as injured even if the fork had not failed — just the front wheel stopping so abruptly would have put him on his face. Watch out for those squirrels!"I feel horrible for the cyclist and the squirrel. I have a carbon fork on my road bike and a carbon mountain bike frame. Jo has carbon forks on both her road and mountain bikes. I'm well aware of the physics behind how carbon works in different applications and agree that this would have resulted in a bad crash regardless of the material, but it is interesting to see how it failed. Next time I'm doing 50 mph down left hand canyon I'll be scanning the road for anything that could pose a hazard!
Here are some pics: