As of Friday morning, 2/25/11, the water temperature at the surface of Percy Priest Lake is 43. Officially, you'd have about 30 minutes until you loose consciousness. But we discovered last weekend trying to free the anchor rode that you loose feelings in your hands very quickly. We were not able to get the first turn off the prop because our fingers lost feeling before we could do even that most simple task.
Accordingly, please consider that a MOB in 40 degree water will almost certainly require retrieving someone who is not able to help you in the most simple ways.
You might find this little article from BoatSafe of interest: http://www.boatsafe.com/nauticalknowhow/hypothermia.htm
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