RE: I blew an engine
Bruce,
This failure might actually be metal fatigue related, after... if I calculate 100 hour x 60 minutes x 10,000 RPM average...
This engine must have undergone ~60,000,000 stress cycles... If any metallurgist would care to chime-in and remark, that would be nice.
Unlike steel, which reduces in strength and eventually loses about 30% of its original strength, at ~6,000,000 stress cycles, after which weakening is virtually stopped; aluminium will continue to weaken until it would disintegrate...