hey craz,
year you are correct, the transducer has to be mounted away from plaining strakes and half strakes that can cause turbelence in the water. It is also a good idea to mount it away from any trailer rollers or skids just in case!. On the old boat i had the transducer mounted in the middle rib on the transom so the bottom of the transducer was about 10mm under the hull line so i will probably do the same on this one. Any one else have any ideas?
Remember that the transducer can not come out of the water when you are on the plane becausse it can not shoot through air.

Boatie.