Originally Posted by ben5883
....on powerboats transom mounts are the nuts ......through hulls and in hulls dont work as well on the plane on a rib
ben, that is not my experience and I know others on the forum feel similarly. Even if the tranducer is placed well and manages to track the bottom at speed, ribs frequently leave the water and the sounder will loose the bottom and not manage to lock on again before the boat hops off another wave. Also, transom mount transducers are designed to kick up on impact and they do this on landing.
Because of Codder's comment in this thread, when I was last out I took note of the the sounder when I was over the deeper areas of water and travelling at about 35 knots over chop, the sounder was following the bottom detail without a problem at 185ft. This is a simple Garmin unit with a transom transducer stuck to the inside of the hull using silicon about 1metre forward of the transom.