Any of the Airmar dual channel bronze/stainless through hull series transducers will use the massive fairing block Skunk mentioned so the install would be custom but would likely provide good results.
First would be to focus on/pick the transducer frequencies and cone width based on the type of use/fishing you’ll be doing. Airmar makes multiple transducer models with the same elements but different mounting options. What Skunk suggested are the same elements as the transducer that was recommended but with a slightly wider cone angle for the Low frequency elements.
Another consideration is whether you can use a flush mount through hull on your boat as I’ve heard that larger boats near 30 feet (more a function of displacement) have issues with boundary layer flow interfering with flush mount transducer installations; hence the recommendation for a fairing block or pocket mount.
Best bet would be to talk to the installers and go with one who will stand by their installation/make it right and guarantee it in writing.
Some reading if you’re in the mood:
What's the best way to go for these hulls on Transducers? Not sure I would want to cut hole and add flaring block? Flush Mount looks like a better way to go to me. Anyone have any feed back? Looking at a Airman B175M flush mount vs a V744 With flaring block?
downeastboatforum.com
Marine Electronics Forum - Flush Mount Transducer vs High Perf Block? - Does anyone have any real world field experience with a flush mount transducer? These are the newer transducers that are designed for the faster trailerable boats. They are a very low profile so the face of the transducer is...
www.thehulltruth.com
