Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-20-2019, 08:41 AM   #1
Veteran Member
 
Beekeepergreg's Avatar
 
City: Manasquan NJ
Country: United States
Vessel Name: Mayrose
Vessel Model: Mainship 30 pilot
Join Date: Nov 2017
Posts: 81
Transducer face soda blasted, what to do?

I had the yard soda blast my bottom, they didn't protect my transducer.
I even asked if I should tape the face--" No we will do that".
Is this a big deal? I have a SS75H-12degree.

Do I wet sand the face?
What grit?
My instinct would be to start with 220 and work thru to 2,000.

They did do a nice job on the bottom. 50 $/ft

Greg
Attached Thumbnails
Click image for larger version

Name:	Photo Jan 19, 11 29 25 AM.jpg
Views:	55
Size:	140.7 KB
ID:	84458  
__________________
Advertisement

Beekeepergreg is offline   Reply With Quote
Old 01-20-2019, 08:44 AM   #2
Veteran Member
 
Beekeepergreg's Avatar
 
City: Manasquan NJ
Country: United States
Vessel Name: Mayrose
Vessel Model: Mainship 30 pilot
Join Date: Nov 2017
Posts: 81
Bye the way, Rosie and I installed this transducer last July

We installed the SS75 transducer last July. Looked great coming out of the water this fall.
__________________

Beekeepergreg is offline   Reply With Quote
Old 01-20-2019, 09:22 AM   #3
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 6,823
If I were going to try to smooth the surface, I'd think about a plastic compounding wax. They seem to work reasonably well through a thin layer of marine growth. I'd be tempted to leave it alone.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 01-20-2019, 09:47 AM   #4
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 3,672
I think I would try it before you do anything to it. If it doesn’t work correctly then have the yard haul the boat and replace it. Take photos and discuss it with the yard before you do anything. If they are a reputable yard and the depth finder doesn’t work they should stand behind it.
Comodave is online now   Reply With Quote
Old 01-20-2019, 11:10 AM   #5
Senior Member
 
Roger Long's Avatar
 
City: Albany, NY
Country: Albany
Vessel Name: Gypsy Star
Vessel Model: Gulf Star 43
Join Date: Jul 2015
Posts: 283
Transducers work just fine installed in anti-freeze cofferdams glued to the inside of solid fiberglass hulls. I would be very surprised if you notice any change in performance. I'd follow Comodave's advice though.


If I was going to tangle with the yard, I would do it on the basis that the now roughened surface will pick up growth and degrade performance faster; not that it may not work in the first few days or weeks. It will also be harder for divers to clean. The yard failed in their implied promise that the transducer would be the same when the job was done as when it began. There is a case to be made that they should just put a new one in now.
__________________
Roger and Patsy
"Gypsy Star" Where are we?
https://share.findmespot.com/shared/...BunICxVztYVRlg
Roger Long is offline   Reply With Quote
Old 01-20-2019, 01:25 PM   #6
Guru
 
City: Fairport
Country: United States
Join Date: Jan 2017
Posts: 1,407
I would not spend time smoothing a transducer face, especially if I was going to paint it with AF.
diver dave is online now   Reply With Quote
Old 01-20-2019, 01:45 PM   #7
Guru
 
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 1,895
Dont worry about it, it will still work fine.
I have seen them work with chunks missing.
sdowney717 is offline   Reply With Quote
Old 01-20-2019, 01:50 PM   #8
Senior Member
 
Gabe n Em's Avatar
 
City: Point Judith, RI
Country: USA
Vessel Name: In Sanity
Vessel Model: 1981 Mainship 40'
Join Date: Jan 2015
Posts: 401
You'll lose some performance. It may be negligible but there will be some scattering due to the rough surface. If they promised they'd cover it and didn't, I think it's pretty straightforward - they owe you a new one.
Gabe n Em is offline   Reply With Quote
Old 01-20-2019, 02:05 PM   #9
Guru
 
JDCAVE's Avatar
 
City: Lions Bay, BC
Country: Canada
Vessel Name: Phoenix Hunter
Vessel Model: Kadey Krogen 42 (1985)
Join Date: Apr 2011
Posts: 2,122
Please check with the manufacturer (Airmar) first. The damage could have affected the beam geometry. None of us here, including yourself or the yard, can comment with any authority on this. I would not attempt any repair yourself.

Transducers are the most important and sensitive component in any hydroacoustics system. In theory all transducers should be accompanied with a graph of the geometry of the beam—a so-called beam map. Any physical change of the transducer will affect that beam map.

Each transducer, even of the same model is different, depending on how (the resin) was poured.
JDCAVE is offline   Reply With Quote
Old 01-20-2019, 02:23 PM   #10
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 7,655
Quote:
Originally Posted by JDCAVE View Post
Please check with the manufacturer (Airmar) first. The damage could have affected the beam geometry. None of us here, including yourself or the yard, can comment with any authority on this. I would not attempt any repair yourself.

Transducers are the most important and sensitive component in any hydroacoustics system. In theory all transducers should be accompanied with a graph of the geometry of the beam—a so-called beam map. Any physical change of the transducer will affect that beam map.

Each transducer, even of the same model is different, depending on how (the resin) was poured.


Airmar
Larry M is offline   Reply With Quote
Old 01-20-2019, 04:18 PM   #11
Guru
 
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 1,895
The electronics inside have not been affected.
The transducer surface transmits and receives the sound signal.
Simply filling in the surface to make it smooth with no encapsulated AIR, the functionality is 100% again as new.
Transducers can shoot signals through water and fiberglass cloth and resin, and an outer rough painted hull surface but not through AIR.
sdowney717 is offline   Reply With Quote
Old 01-20-2019, 05:23 PM   #12
Veteran Member
 
Beekeepergreg's Avatar
 
City: Manasquan NJ
Country: United States
Vessel Name: Mayrose
Vessel Model: Mainship 30 pilot
Join Date: Nov 2017
Posts: 81
Thank You for the comments.
I really appreciate everyone's opinions.
I am waiting for the Yard to reply.
The Service manager did seem concerned when I told him.
I plan on calling Airmar Monday.
Not ready to agree or do anything too quickly.
Greg
Beekeepergreg is offline   Reply With Quote
Old 01-21-2019, 06:31 AM   #13
Guru
 
Fish53's Avatar
 
City: Pitcairn Island
Country: yz
Join Date: Jul 2015
Posts: 560
I use transducer anti fouling paint on mine, from the look you could just paint it if it works.
Fish53 is offline   Reply With Quote
Old 01-21-2019, 09:07 AM   #14
Guru
 
City: Fairport
Country: United States
Join Date: Jan 2017
Posts: 1,407
Make sure that Airmar, and the yard manager get you the correct Snell's equations.
The refractive index is important. Air = 1.00; Water = 1.33; Polyurethane = 1.34. At the ultrasonic boundary of the xducer and water, that delta of (n) is critical. Note that water and poly... is about the same. That means not much will happen at that interface. Note also the big difference from water to air, that is significant, setting up a large reflected wave.
It's possible air entrapment may make an issue, in some cases. That's why I suggest painting; that should have a leveling effect.
__________________

diver dave is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 06:46 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012