Installing depth-finder in-hull - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 30 Old 02-22-2011 Thread Starter
Junior Member
 
Join Date: Feb 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Installing depth-finder in-hull

Hi There,

So we are near purchasing a 25' sail for the first time.

I've always had a depth finder on motor boats prior, generally more for the fish finder part though I can never catch fish

some depth finders allow the sonar to be installed inside the hull.

I am playing with the idea of installing a depth finder for the sail boat, again mainly for fishing and inside the hull rather than drilling through the hull to mount outside. But maybe this is a useless item and my meager budget would be better spent elsewhere.

what are your thoughts? do you own a depth/fish finder? if so, have you installed inside the hull? any problems come up doing that?

also, if installed in the hull, if I reversed the sonar so the part that is suppose to face toward the bow is now facing the stern, would I end up with readings ahead of the boat or is that not how it works?

it would be good to see depth ahead if that's how it works.

You can call me Joel.
Capslock118 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 30 Old 02-22-2011
Senior Member
 
QuickMick's Avatar
 
Join Date: Oct 2009
Location: California
Posts: 1,381
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
 
I hooked up my hummingbird this way, works like a charm. i put it in a bag of water(which im not sure if you need to do) and moved it around till i liked reading, removed from bag and epoxyed it to the fiberglass (after a decent cleaning), when i pushed it down into the epoxy, i kinda used a twisting motion to get rid of any bubbles. there is another method with mineral spirits filled pvc but i didnt go that route. what your boat is made of is a consideration, as well as not forgetting to offset the unit to keel depth.

mine is in the engine compartment, but i use that unit primarily for fishing from the cockpit, and do have redundancy via thru hull unit. if you are worried about grounding id put the transducer toward the bow to 'see' what is in front of you.

good luck

edit: while i maybe off base, i believe the number of 'beams' affects size of area you can view-spinning the transducer wouldnt affect the range, persay just make everything on the scrolling display be backwards... i think~that last bit was giving me a headache... lol.

How inappropriate to call this planet Earth when it is quite clearly Ocean ~ Arthur C. Clarke

Quinn McColly
Macgregor Venture

Last edited by QuickMick; 02-22-2011 at 02:05 PM.
QuickMick is offline  
Quote Quick Reply Share with Facebook
post #3 of 30 Old 02-22-2011
Senior Member
 
Join Date: Oct 2007
Location: Brazil
Posts: 984
Thanks: 3
Thanked 24 Times in 23 Posts
Rep Power: 8
 
Rather than glue it with epoxy, you can use silicone. The advantage of silicone is that you can always remove the transducer at a later date or move it to another place. It has to point down to read the bottom (ie. in the same orientation it would be in if attached to the outside of the hull). It won't read ahead of the hull. You can try installing it ahead of the keel, but the millisecond warning it will give you before you run aground won't do you much good. It's best to find a place that has no turbulence and won't be out of the water when heeled over. I installed two in my boat and both work fine. Don't drill holes in your hull if you can avoid it!

Vindö 50
copacabana is offline  
Quote Quick Reply Share with Facebook
post #4 of 30 Old 02-22-2011
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,555
Thanks: 109
Thanked 316 Times in 302 Posts
Rep Power: 10
     
Forward looking depth sounders are available, but are pricey, use bulky transducers and are not 'the norm'.

Generally your depth indication is going to be whatever's directly below the transducer, wherever that is. Most are mounted ahead of the keel to give you a (very little bit of) warning, and only if you're going very slowly. Mounting ahead of the keel also minimizes interference from vortices and disturbances to the water that can confuse the sounder (as an example watch your sounder readings anytime you're reversing at some revs, or if you're backing down hard... the number is often all over the place)

Epoxy, silicone, or liquid cavity mounts are ways to mount inside the skin of the hull. I think it works better in single skin hulls vs cored hulls, and you will lose some range but it does avoid the issues with adding a through hull fitting.

A transducer intended as a through hull will probably need to be mounted in the lid of a liquid cavity style installation.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is online now  
Quote Quick Reply Share with Facebook
post #5 of 30 Old 02-22-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,510
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
They will not work in a cored hull, but even cored hulls are usually solid fiberglass along the keel. Any epoxied transducer can be mounted inside. On my current boat I installed a Raymarine ST-40 and it comes with an Airmar transducer designed to be mounted in a drilled hole. I just removed the nut and gasket and epoxied it in. I installed it under the aft most part of the V-berth, on the centerline. You will get less disturbance in this location. As posted above place the transducer in a baggie of water and check that your chosen location works first.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #6 of 30 Old 02-22-2011
1977 Morgan OI 30
 
Joesaila's Avatar
 
Join Date: May 2007
Location: Massachusetts
Posts: 438
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
I gonna do this! I want to connect it w my garmin chartplotter w/o drilling another hole in the hull. The original digital unit is only about 90% correct. It seems to blink off at the most inconvenient times. THANKS FOR THE GOOD POINTERS!

My formula for living is quite simple. I get up in the morning and I go to bed at night. In between, I occupy myself as best I can.
Cary Grant
Joesaila is offline  
Quote Quick Reply Share with Facebook
post #7 of 30 Old 02-22-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,510
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
YOU"RE WELCOME

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #8 of 30 Old 02-22-2011
Senior Member
 
Join Date: Aug 2009
Posts: 266
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
This months SAIL MAGAZINE addresses this issue right to the point.
sailor50 is offline  
Quote Quick Reply Share with Facebook
post #9 of 30 Old 02-22-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,510
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
It is also addressed here: WEST SYSTEM | Modifying and Customizing Boats - Depth sounder installation

And as they state most manufacturers of depth sounders recommend epoxy for installing the transducer. Less chance of bubbles.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #10 of 30 Old 02-22-2011
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,555
Thanks: 109
Thanked 316 Times in 302 Posts
Rep Power: 10
     
In a somewhat related question:

We've recently upgraded to a compact plotter/depthfinder and we already have an aging but functional Signet DS. I'd like the expanded features of the newer/smarter depthsounder capabilities, and the internal install has appeal for obvious reasons.

Anybody think there would be cross-talk between two simultaneously operating systems? The new one has selectable Hz settings - should I make them different? I'm thinking of mounting them some distance from each other.. Any thoughts?

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is online now  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Depth finder geolarry Electrical Systems 1 08-27-2008 07:39 PM
Depth Finder ozarkmom43 Gear & Maintenance 2 06-13-2008 09:12 AM
depth finder buckbob Gear & Maintenance 5 04-16-2008 10:12 PM
Depth Finder Duke 7184 Gear & Maintenance 6 09-18-2007 10:36 PM
depth finder duffyM Gear & Maintenance 1 11-22-2001 05:15 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome