foam for in-hull transducer mount

I'm trying to locate some high-density foam to make an in-hull transducer mount. I'm trying to make the mount where you can simply wedge the transducer in the foam filled with water, not the glue down type. Pool noodle foam seems too soft. Please let me know if you know of a source.

Thanks,
ernest

I used a pool noodle and it works fine.
I also used another piece of pool noodle stuffed into the top of the mount to keep the transducer from popping out if the noodle flexes too much.

I don't have a pic of it but I can get one if you're interested.

-Mike

I work in a shop where we get windshields shipped in wooden crates and they come packed in heavy duty noodle  foam blocks that I have used with good luck so maybe if you ask your local body shop for foam they may set you up

Everyone seems to use pool noodles without any issue, but I also felt it was a little too soft.

I ended up using a kickboard and cut a piece out from that.

I also used medical ultrasound gel inside the foam instead of water, and since installing the transducer, I have never had to replace the gel (going on a little over a year). And I store and transport my yak upside down.

Peter

I cut a piece out of one of those foam rubber gardening kneeling pads and it works great.. water never leaks out and the transducer fits nice and snug.

I know engineering things for kayaks is fun, but for $3.00 you can get the hobie foam transducer pad from Austin Kayak.

I used the garden knee pad as well. Cut the shape of the transducer just a tad
smaller for a snug fit. It has been working great without any issues so far. This is
how I did it using marine goop.

Jedmo

Great info everyone!

Thank you,
ernest

I use a big giant pool noodle. No way is my transducer coming out.

I cut mine from an old Boogie Board and it's been working great.

Martin

I went to Michaels and bought a 4" foam rubber letter "O"
It's worked perfectly for 3+ years now

My first transducer puck made of pool noodle still works great after three years of use.  It fits snugly and water tight, and has never had any issues for me.

But recently I did a few more puck installs with pool noodle and wasn't so happy with the results!  My latest attempts dont feel nearly as snug, and I didn't really think why that was until reading this post and thinking a bit more about it.

I went back and looked at my first install.  Its funny, cause i'm much better at cutting the foam now, my old one was kinda jagged inside and on the top, but still holds fine.  But I noticed two things that differ other than that from my recent installs. 

I wanted to use less water to fill my new ones, so I made them smaller!  My original was about twice the height of my current pucks.  The taller one just feels much more stable than my shorter ones!  I see now why a much more ridged foam might work better, if you want to do less filling before leaving.

Also, my old transducer was rounded on all edges (Eagle) but my new one is flat on the outsides (Hummingbird).  Both of them I cut the puck center smaller than the actual ducer.  But I think I got a better seal on the rounded one! 

Anyway, i'm thinking of trying a differn't foam or raising the height and maybe reinforcing the sides with tape (like Porky's install) when i'm ready to redo it.

Anyway, i'm thinking of trying a differn't foam or raising the height and maybe reinforcing the sides with tape (like Porky's install) when i'm ready to redo it.

I use the rounded TD. One thing I always do is take a match to the inside of the pool noodle after I cut it. This smooths the inside and makes it so it will not absorb any H20.
I like the deeper pool noodle because if worse comes to worse I can always put a plastic liner inside of it (like Saran Wrap), fill it with water then push down the TD. Just a back up plan if it should ever leak...haven't had that problem tho.

I like the deeper pool noodle because if worse comes to worse I can always put a plastic liner inside of it (like Saran Wrap), fill it with water then push down the TD. Just a back up plan if it should ever leak...haven't had that problem tho.

Hummm... Wish I thought of that before going out at GMS4!  Instead when I found my puck was not sealed and leaked, think the goop was old and didn't adhear well.   I looked around at 6AM for a substitute! 

Humminbird has a kayak mounting hardware kit (MHX XMK) that uses some type of marine-grease instead of water or epoxy. I would assume that if you used the grease you could also use lower density foam. Or as obkook said he uses medical ultrasound gel. It would help to suction it down and would not be as prone to leaks. Just some food for thought.