fiberglass questions

[sailnewbie]

And we did, I havnt slept on a boat in years it was great!

 

[BudGates]

Sounds great, keep in mind that the water pressure is very low so you shouldn't have any trouble. In scuba training you are taught that at 33 feet is one atmosphere or 14.7 psi. So if your transducer was say 2 feet deep it would only be about 1 psi. If your through hole fitting was 2 inches in diameter you would have 3.14 square inches so the force on your patch would be about 3 pounds. I think you can sleep at night now.

You're forgetting that you have a dynamic system. This accounts for the boat just sitting on the water but once you introduce chop, waves, or even one knot of movement your pressures increase drastically. This doesn't even account for a slight bump at the dock.

 

[jibes138]

Gee I thought I was being conservative since the hole is probably less that 2 inches in diameter. Also flow of a fluid over a surface tends to decrease the pressure this is why airplanes can fly. I agree if the boat launches off a wave and is temporarily airborne and smashes into the wave trough the pressure on the patch might go up a little bit.

 

[sailnewbie]

I have no plans of jumping,launching or anything else that get me airborne so I think I'm OK, thanks for the input though, lol