I've read from quite a few sources that during the World War II, it was not that uncommon a mishap for a fighter pilot to take off with a "coarse pitch" / "low RPM" prop setting. This would typically happen as a result of pilot fatigue after a prolonged period of intense activity, aggaravated by the fact that in a single-seat fighter there were no other crewmembers to warn about the incorrect setting.
Sometimes, though apparently not always, the result was a crash. Even if there was no accident, writers depicting these incidents would usually use a tone indicating that they considered such a takeoff a first-rate blunder and an indication that the squadron as a whole was overtaxed and in an urgent need of rest. So, clearly it was a serious pilot error.
I started to think about what would go wrong in such a takeoff and found out that it's not at all obvious to me. I know how constant speed propellers operate, including the analogy of blade pitch with automobile gears, and understand that the engine isn't able to provide maximum performance on a low RPM setting, even at full throttle. However, since there were successful takeoffs as well, and especially because the lack of performance seemingly wasn't so severe as to make the pilot realize that something was wrong and to abort the takeoff run, it doesn't look to me like the reduced power alone would readily explain the mechanics of a crash in that situation.
So, what was the fundamental reason for a low RPM takeoff to end up in a crash? Did the aircraft simply roll past the runway's end or stall upon rotation due to the lack of power? Or would the engine fail catastrophically because of misuse? Surely the pilot would see from the instruments that airspeed wasn't building up as intended if it was just about a deficit of power?