Rosalie B. wrote:
....
We were motor sailing along, as the breeze basically died (although it
was from the predicted direction), and I was in the aft cabin when
suddenly it sounded to me as if the engine was running away.
....


Was it an exhaust type sound, which could be an exhaust leak or header
problem, or a mechanical sound, like a water pump or even alternator
bearing? Was there a vibration with it? As the Car Talk guys would
say, "Can you make the sound for us?"