Forces, was that YOUR engine that disintegrated? If so, sorry to hear it, but yeah, too high revs will do that.
one of the guys at our field has the FG19R3 and he had a prop that was at the lower end of the specified props and he was getting 10,000+ rpm out of it! It sounded like an angry was and the prop tips were going supersonic... I recommended he go up in pitch and since then it sounds better and pulls nicely.
there are too many moving parts here to hit those rev ranges imo..