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Will a painted transducer affect performance?

Old 04-11-2004, 10:50 AM
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Default Will a painted transducer affect performance?

The previous owner of my boat painted the Airmar P66 ducer. I always lose depth reading and picture freezes at cruise speed (anything over 20 mph). At idle and low speed I don't have this problem. Just wondering if the layer of paint is having any negative impact.
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Old 04-11-2004, 11:04 AM
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Default RE: Will a painted transducer affect performance?

Most anti-fouling paints have metal in them. I would think depend how many coats of paint are applied it could affect the performance.

Is there paint on the bottom surface of the Xducer??

I only use the water based paints on my transducer with marginal results even with a lot of scrubbing. Wish there was something better.
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Old 04-11-2004, 11:45 AM
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Default RE: Will a painted transducer affect performance?

Assuming there is paint, how can I remove it without damaging the ducer?

With my old boat, I never painted the ducer and it worked fine. I would periodically scrape the growth off but it was never an issue.
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Old 04-11-2004, 01:46 PM
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Default RE: Will a painted transducer affect performance?

I wouldn't think it will affect it all that much. Some boats have a shoot-thru transducer and the bottom of the boat is painted. I think the problem you are having is most likely due to how the transducer is mounted. You may be able to move it up or down slightly and get better performance. It should project about one eight of an inch into the water when you are on plane. Also check and be sure that the transducer surface is parallel to the water surface when you are on plane. The airmar website has installation and trouble shooting info. I also have the p66 and after careful adjustment I am able to get a good reading all the way up to 55 mph.
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Old 04-11-2004, 04:55 PM
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Default RE: Will a painted transducer affect performance?

thanks rwells but I've already confirmed those issues. I'd like to try moving it a little left or right but can't quite figure how to get the ducer off the bracket. Airmar support has been useless so far. Two e-mails, no response.
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Old 04-11-2004, 06:36 PM
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Default RE: Will a painted transducer affect performance?

The p66 is mounted with three screws in slotted holes. If you loosen them you should be able to move and rotate the transducer. One way to see if the problem is due to positioning is to get on plane and take turns to port and starboard and see if the readings are better or worse. If the transducer is on the starboard side of the prop and you turn to starboard and the readings are OK then you know it is a placement problem. I had to move mine around quite a bit to get it to work at all speeds. One problem I had is that the transducer would pop up at speeds over 45 MPH, I fixed it by drilling and installing two small SS sheet metal screws on each side of the plastic bracket. I now have a "break away" rather then a "pop up" mount. Where is the transducer mounted relative to the prop? I still think it’s a mounting problem rather then a "painted" problem. Try the above experiment.
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Old 04-11-2004, 07:33 PM
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Default RE: Will a painted transducer affect performance?

The transducer is mounted on the starboard side approx 3" from the prop's outside diameter. When the motor is completely turned to the right the prop will be behind the transducer.

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Old 04-12-2004, 06:47 PM
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Default RE: Will a painted transducer affect performance?

Hey Reel Pursuit,

I got this off of the FAQ at Airmar

http://www.airmar.com/faq/faq_index.html

Q:
What brand of antifouling paint should be used?

A:
Brands we use are:
Woolsey, Petit, and MDR (Marine Development Research).

Any water-based antifouling paint is acceptable. Do not use anything containing ketones as they can attack the face of the transducer.

Hope this helps.
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Old 04-12-2004, 08:15 PM
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Default RE: Will a painted transducer affect performance?

thanks rwells. I've seen that before. Problem is, I don't know what the previous owner painted it with.
I'm thinking about taking some steel wool to it lightly to see what happens.
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Old 04-19-2004, 12:11 PM
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Default RE: Will a painted transducer affect performance?

Bump from rushman
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Old 04-19-2004, 12:17 PM
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Default RE: Will a painted transducer affect performance?

I bought "transducer antifouling paint" and put it on my transducers with no problem. Regarding the wool, you should be okay. The directions on the paint I applied actually told me to "lightly" sand the transducer before painting. I very hesitantly did so and have seen no ill effects. In fact, it sure is nice not to have barnacles on my transducers mid season.
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Old 04-20-2004, 01:29 AM
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Default RE: Will a painted transducer affect performance?

Sand it down with a fine sand paper, and than apply transducer paint. Almost all marine shops should have it by the counter.
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Old 04-21-2004, 09:33 AM
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Default RE: Will a painted transducer affect performance?

Reel Pursuit - 4/11/2004 6:33 PM

The transducer is mounted on the starboard side approx 3" from the prop's outside diameter. When the motor is completely turned to the right the prop will be behind the transducer.
think of your prop, with the exhaust shooting thru it, as a giant noise source. I don't think the problem is a quarter millimeter of paint, my guess is the pounding its taking being so close to the prop. Can you try a spot further away? If it has to move forward of the transom, try a ziplock with water in it, place the ducer a few feet forward of the current location sitting on the bag, as a test.
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Old 04-21-2004, 10:05 AM
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Default RE: Will a painted transducer affect performance?

I assume your boat is on the plane at 20 MPH. The problem is probably air being drawn under the boat. Does the problem begin at different speeds and water conditions.

regards

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Old 04-21-2004, 10:46 AM
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Default RE: Will a painted transducer affect performance?

The ducer is presently mounted on the transom. If I move it away from the prop (to the right) I'll be getting close to the trim tabs. Tech support from Furuno suggested I move it a couple inches toward center after showing him a few pictures. Not sure if that will work.

Seems like my problem begins at various speeds. The only time I really get a consistent reading is at idle or headway speed.

I wish I had a solution for this problem. I may have 2 options at this point:
1. install a piece of starboard on the transom and try the ducer at various locations
2. install an in-hull ducer and use the existing hole in my transom to run the temp sensor. Both of these can be connected, I assume, to the Furuno via Y cable.
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Old 04-22-2004, 10:34 AM
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Default RE: Will a painted transducer affect performance?

Reel Pursuit - I understand your dilemma. 1.) I think that you can assume that it is a sovent-free paint because if it was not the plastic would have probably swelled and softened. 2.) What ever abrasive you use to remove the paint, make sure that you do not leave scatches on the plastic as scratches will attract and hold air bubbles. The acoustic face of the P66 is produced in a highly polished hard metal injection mold - the result is that it wets very quickly and you do not want to undo a good thing. 3.) How about a fine wet sand paper? 4.) Have you experimented with mount (raising, lowering, etc). Maybe the issue is not so much the paint as the way the transducer is mounted.
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Old 04-22-2004, 05:10 PM
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Default RE: Will a painted transducer affect performance?

Fitz-
I think you're right. I took the steel wool to the transducer and it didn't improve the situation at all. I'm pretty certain that I'll have to try some different locations. I'm not sure of the best way to go about this. I assume the best way is to install a piece of starboard on the transom and then try different locations.
This may sound like a stupid question, but how do I remove the P66 from its current position? I've looked all over it and don't see where it could be unscrewed or otherwise detached. ;?
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Old 04-22-2004, 09:55 PM
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Default RE: Will a painted transducer affect performance?

If you "pop" the transducer up by striking it with the flat of your hand in an upwards motion you will see the three screws. There is a piece of plastic at the top of the bracket that rotates to allow the transducer to be separated from the plastic piece that is screwed to the transom. The airmar site has an online manual that shows this. If you don't have any luck finding the manual let me know and I’ll take a picture of the mounting when it is separated so you can see what it looks like.
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Old 04-23-2004, 09:17 AM
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Default RE: Will a painted transducer affect performance?

Rwells-
thanks for the info. I checked with Airmar's website and I didn't see the info you suggested. If possible, can you post a pic? That would be greatly appreciated. Thanks in advance.
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Old 04-27-2004, 12:36 PM
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Default RE: Will a painted transducer affect performance?

Hey Reel Pursuit,
Sorry for the delay in replying, my internet connection was down. I didn't get a chance to take a picture of the bracket. However I have an extra set of instructions that come with the p66. It shows how and where to mount the transducer. And how to trouble shoot if you get poor readings. If you want to send a message to my "tackle box" with an address you would like me to send the instructions too, I'll be glad to drop it in the mail for you. I'll still try to take a picture when I get a chance.
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