On my boat, the long transducer on the transom throws a pretty good rooster tail up and gets the motor all wet. Anybody have a shield they use to address this?

I sounds like a bad placement.  However, more information and some pics would help a lot.

This is on a flats boat and from my research is a common problem. Disregard the aluminum metal piece going vertically from the transducer mount. That was an attempt to alleviate this problem but the top part of it eventually broke off. 

Edited February 26, 20224 yr by SC53
Added bracket explanation

What a dorky problem design. They never tested it on boats.  Obviously

That would bother me.

Do they make an in hull transducer for your fish finder ?

I know my Fish finder offers an in-hull mounting kit but if I'm not mistaken,it will only read through Fiberglass.

10 minutes ago, Bird said:

That would bother me.

Do they make an in hull transducer for your fish finder ?

Not for down and side scan. 

25 minutes ago, cyclops2 said:

What a dorky problem design. They never tested it on boats.  Obviously

Not sure what you are getting at. 
This is a Lowrance side and down scan transducer. The one to the right is their skimmer transducer. 
 

FYI, The transducers work perfect. The spray is from the large down/side transducer. 

I have a similar set up and had the same deal with the water coming up and back into my rig.

Got Old very fast.

No amount of 'adjusting' it came close to helping.

I have a 'transducer' mounting plate on the hull 

Went with this unit.

Solved it instantly.

(not my rig in the pic - file pic)

 

https://www.amazon.com/Boat-Zone-BLACK0101-Transducer-Shield/dp/B07ZL9SWWV/ref=asc_df_B07ZL9SWWV?tag=bingshoppinga-20&linkCode=df0&hvadid=80333160033375&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583932709155520&psc=1

 

A-Jay

Thanks A Jay. That’s what I was looking for. ?

That transducer is not designed to be in the water when you are on plane.

5 hours ago, SC53 said:

On my boat, the long transducer on the transom throws a pretty good rooster tail up and gets the motor all wet. Anybody have a shield they use to address this?

I encounter this problem too.  But my boat doesn't go that fast to even produce a rooster tail so the spray is not that big of an issue.

4 hours ago, Jig Man said:

That transducer is not designed to be in the water when you are on plane.

Ok but the problem still exists. I don’t use it to read on plane, that’s what the skimmer is for. 

I stopped my  Patent Application for a " Flat Plate Deflector. "

All transducers will read thru ANY SOLID hull material.  some bottoms can have Styrofoam types between inner and outer hull surfaces. All shoot right thru solid Aluminum.

 

Test by using water inside hull. Press ducer against hull in deep water of KNOWN DEPTH. Should agree. Speed up the boat . Retest the same depth spot.   different reading ? move ducer closer to keel & repeat speed runs.  I clean the hull spot with a rag & Acetone. Big enough G E   RTV blob. Press ducer into the blob. Temporarily tape the ducer to stay vertical with a small piece of wood just on the edge till firmed up.

According to Hummingbird you cannot mount a side scan transducer inside the hull and shoot thru. 
 

Can I epoxy the Side Imaging or Down Imaging transducer in the hull of my fiberglass boat and allow the sonar to shoot through the hull?

No. Side Imaging transducers have beams that shoot out to the side of the transducer therefore they cannot be epoxied into the hull and work properly.

In addition, we do not recommend this type of installation for Down Imaging.  Shooting through the hull of a fiberglass boat causes the signal to be lost.