I put some pedals on one of my bikes, and hand-threaded the drive-side pedal in a little bit, got distracted and forgot to tighten it the rest of the with a wrench. So, when I stood on the pedals to accelerate away from my first stop of the ride, the pedal ripped out of the crankarm.
The crankarm was at about 4 or 5 o'clock when I stomped on the pedal, and the threads that were on top (above the pdal axle) were the ones that got stripped. It's only the first two or three rows of threads closest to the pedal.
Now, I think it will be okay to continue to use the crank, but wanted to get feedback on this. The reason I think it will be okay is that the threads function to hold the pedal from pulling out horizontally (along the axis of the pedal axle) and most of the crankarm threads will still engage the pedal threads: 7 of the 9 or 10 threads are still intact, and the threads furthest from the pedal axle are probably slightly more important anyway. The place where 2 or 3 threads are stripped is only on one side, and the pedal threads will still seat against metal in the vertical plane at that point.
Interested to hear what you think. Here are pictures: full-on the stripped part, half-on the stripped part, and finally a photo of the threads on the bottom (with the crankarm at 4 or 5 o'clock position) that didn't get stripped.