Transducer

[georgeirl]

Quick question, figuring out a few things for a new project.

Thru-hull or transom mount for a transducer?

On my last boat, the transom mount was useless at anything more than 20kts, never knew if that was disturbance from the drive or due to the speed it couldn't keep up.

Lowrance unit, new project is outboard if than makes any difference to advice.

Thanks you in advance.

[Pikey Dave]

I’ve had “in -hull” transducers on the last two boats with very good results upto 30kn. TBH if you’re getting a good trace at 20kn with a transom mount, you’re doing well.

[georgeirl]

Thanks Dave, and you are right, its in-hull not thru-hull!

George

[jonp]

I've used transome mount on every boat I've owned, no probs holding bottom and clearly showing detail at speeds of 30knots. However when I reach around 300m deep I start loosing it at over 22knots, which is simply down to the time it takes the signals to return. Also in water deeper than 300m 200khz starts to drop out, 50khz holds to beyond 500m ( Lowrance 200/50 hst).

I fitted one transducer in hull where I cut a hole through the bottom of the boat ( last boat I owned ) I've had far less luck at holding bottom at speed and finding bottom in deep water using through hull transducers.