Well good news and very very bad news.. I went and got a 35 mm prop with alot more pitch and tried it out this morning. I'd say speed would probably be about 30mph. It was at this point about 60m from shore that a gust of wind hit the boat front on and caused it to barrel roll is a very spectacuar fashion at least 4 good somersaults before landing the right way up. Boy was i relived untill i noticed that the batteries had come loose and were both on the one side causing the boat to dip its back under the water.
It sunk 20 sec later, the foam in the nose was enough to keep the top 10 cm of the boat abover water. About 10 sec after that the water got into the esc and alot of smokepuffed out the top with a definate electrical smell. I was forced to swim out to retrieve it.
I have since recovered what i can i think i might be able to recover the servo, reciver, batteries, maybe the motor and i will have to air the hull out to get rid of that horible electrical smell, but the ESC is fried.

Does anyone think i should buy another ESC and try it with my motor or do you think the motor will also be dead?