Thru-Hull install

2006 Views 11 Replies 8 Participants Last post by DuckNut, Oct 17, 2019

Water Bound

Discussion Starter · Oct 16, 2019

Picked up a B75H for my 02 HB Guide. Before I attempt the diy install, anything I should do/know other than the instructions diagram attached? TIA!

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DuckNut

· #2 · Oct 17, 2019

Better read the fine print because I don't think it is compatible with a hells bay

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Smackdaddy53

· #3 · Oct 17, 2019

https://www.google.com/search?q=b75h+transducer&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari

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State fish rob

· #4 · Oct 17, 2019

Don’t do it. You ll be water bound. Thru hull or stern mount only way to go in my OPINION

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I'm not fond of thru hull transducers for small skiffs - but if that's what you want... this is an item that needs expert installation.... Among other considerations you not only want it on a portion of your hull's bottom with no turbulence (on a flat without a strake in front or beside it so you get a smooth water flow for clear readings....) but you also have two other considerations... The first is that it's in a location where it won't be impacted by a trailer support when launching and retrieving then pounding down the road.... since the transducer is set into a hole in your boat's bottom.... The second is that I'd want it in a place that's easily accessed from inside your skiff so that if you ever have a problem with it you can easily see it's point of installation (for leaks, etc. ) but also be able to replace it and/or remove and actually be easily able to repair and/or plug the hole that it leaves if it's not working out...

Maybe I'm overly cautious but I've always preferred transom mounted transducers with a "kick up" feature.... Through hull transducers are routinely installed on big boats - but with small skiffs you have choices...

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bryson

· #6 · Oct 17, 2019

I don't have the B75H, but I have a similar tilted element transducer on my Hewes. Check the tilt angle -- I believe it's a 12 degree for that unit, and I think the deadrise on the Guide is pretty low (not sure on that, though), so you may want to look into some other ducers with non-tilted elements.

As far as the install, it's very straightforward. Follow @lemaymiami's advice as far as location, and then cut with a hole saw and fill the raw cored edges with thickened resin or glass. Bond in a fiberglass tube if you want a little extra strength and a nice finish. It's the same as any other through-hull aside from choosing the location, and with a tilted angle transducer you will need to orient it correctly with respect to the keel (it should be clearly marked on the top).

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Lowtidelowlife

· #7 · Oct 17, 2019

I’ve always mounted so they shoot thru the hull. And I always know what the water temp is in my bilge.

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Water Bound

Discussion Starter · #8 · Oct 17, 2019

It is the 0 deg. Thanks for the fiberglass tube idea, that is exactly what I need! Please pm me if anyone has a source for a small piece of 2 13/16 ID.

HB installs them inside the “wet box” area next to the bilge pumps etc, but I hated to bug Paul for tips...he has already freely answered so many questions on a hull built in 2002!

bryson said:
I don't have the B75H, but I have a similar tilted element transducer on my Hewes. Check the tilt angle -- I believe it's a 12 degree for that unit, and I think the deadrise on the Guide is pretty low (not sure on that, though), so you may want to look into some other ducers with non-tilted elements.

As far as the install, it's very straightforward. Follow @lemaymiami's advice as far as location, and then cut with a hole saw and fill the raw cored edges with thickened resin or glass. Bond in a fiberglass tube if you want a little extra strength and a nice finish. It's the same as any other through-hull aside from choosing the location, and with a tilted angle transducer you will need to orient it correctly with respect to the keel (it should be clearly marked on the top).