Thru-hull transducers are not entirely necessary. Transom-mount transducers work perfectly well if correctly mounted inside a kayak's hull and are routinely used by the kayak fishing brigade in their rotomoulded poly sit-on-top kayaks. The shallow draft of a kayak doesn't cause any problems with accuracy. Fish finders do not return accurate results if you are in a couple of feet of water or less, regardless of if you are in a kayak or a boat.

The biggest problem with either style of transducer being fitted inside a hull is ensuring no air bubbles, or anything else that'll interfere with the signal, are between the transducer & the water. In a plastic sit-on-top you often glue the trans to the inside of the hull and you have to be careful how you do it & what glue you use.

Visit any of the major kayak fishing websites & you are bound to find a 'How To' article.

In a strip hull I don't know how, if at all, the minute natural voids in the timber will affect the signal.

Battery-wise, a 12v 7Ah sealed lead/acid battery will easily give you 8 hours running time.

Regards,

Phil.

: Has anyone installed a thru hull fishfinder in a strip built kayak? how did
: it work?

: River Rat