I often look up the planes I rent..I am renting 6349J tomorrow, and noticed this was the last flight for it.
Ballsy in a single engine rental training plane? Look at the altitude and speed graph - were they doing stalls over the water?
I wouldn't put a whole lot of stock in the altitude/speed, as others have said. Also, remember that this is *ground* speed, not airspeed. I've had a groundspeed of 65 knots in the 182 when I had a true airspeed of 133 knots.
In July the water temps are in the 80's with CLE then then the Islands probably always in gliding distance of pleasure boats or dry land.
Wow - I had no idea it got that warm. It is the southernmost and shallowest of the Great Lakes, but Lake Michigan doesn't get that warm. On July 24th, Lake Erie at Buffalo was at 75 degrees (see
http://www.erh.noaa.gov/buf/laketemps/LakeTempsJul.php). On that same day, I actually flew over Lake Michigan (at 13,500 feet) and the temp was about 64.
Would I do that in your average rental 172? Probably not. If it were a plane that I had flown a lot, maybe. Having a life jacket aboard helps - Yes, I can swim just fine, if I'm not injured. I broke a few ribs a few years ago in a jet-ski accident and was damn glad I was wearing a life jacket as I had a lot of trouble moving at all at first.
Each pilot is willing to take different risks. For me personally, the Great Lakes thing got personal when one of the planes I've flown went into Lake Michigan a few years ago. The pilot lived through the ditching unscathed, but did not survive the cold water. After thinking about it long and hard, I decided that a cold bath is not how I want to die. I have only crossed the lake in a single at or above 12,000 feet, squawking and talking, during the late summer, in a plane I know intimately. EdFred went across last week at a much lower altitude, and goes across much more frequently than I. Pick your own poison, I guess.