Originally Posted by piperboy84
...he had a photo of the stub, it was interesting to see there were different surfaces across the breaking point, one part smooth the other pitted.
Originally Posted by piperboy84
It was a C172 , metal prop.
Fatigue. The smooth part is where the fatigue crack progressed quietly on its way, the pitted part is where what was left was no longer strong enough and was torn apart.
If you
search for images of "fatigue failure" on google you'll see many examples of similar failures:
