[Fr. Frank]

Originally Posted by NoBones

Hate to bust your bubble.... but Bennett recommends to mount as
far outboard as possible.
Not saying they will not work, but going to be like on a teeter totter
while underway..

Mount them on the outside planing surface. period.

Your transducer should be mounted like this: Middle of the planing surface, away from chines or turbulence-causing hull shape, and for 3-in-1, tripleshot, totalscan, or sidescan transducers the entire emitting surface must be below the hull on the inside edge. The emitter sends out it's acoustic signal at an 87 degree angle. If it's not below the hull, it's in the air when on plane. On mine, the emitter is nearly hemispherical when seen from directly behind. I can hold sidescan imaging at 30 knots because of how the 'ducer is mounted. It does throw a lot of spray, though.