Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 23-06-2018, 07:11   #1
Registered User

Join Date: Feb 2017
Location: Med
Boat: Dufour 455 GL
Posts: 142
Question Airmar 2 inch thru-hulls: brand-agnostic?

Can I drop a B&G DST800 transducer into the Airmar thru-hull left behind by a (removed)
Airmar ST 20-399-01, Raymarine OEM part E26031?

Or to put it another way, can I remove my existing Raymarine ST800 as if I was just going to clean its little paddlewheel, while the boat is in the water, and instead of it put back a B&G (Airmar) DST800 into the same hole in my hull?

The Raymarine ST60 instruments have stopped working, and I am loathe to invest in replacements for what is now older technology. Given I also have a B&G Zeus3, which is pure awesome, ideally I would like to replace the Raymarine transducer with the B&G DST800 - as long as I don't have to haul the boat out of the water to replace the through-hull.

To clarify, I totally understand that the transducers themselves are (usually) brand-specific, and I am not looking to plug an old transducer into a new instrument, or anything like that.

I would just like to re-use the plastic thru-hull that seems like the ubiquitous Airmar 2" size for a completely new transducer plugged into a completely new MFD. Is that doable?

Thanks for all advice!
__________________

LongRange is offline   Reply With Quote
Old 24-06-2018, 03:51   #2
Registered User

Join Date: Feb 2017
Location: Med
Boat: Dufour 455 GL
Posts: 142
Re: Airmar 2 inch thru-hulls: brand-agnostic?

I will ask the question a different way...

Should I be able to drop any Airmar transducer designed for a 2" through-hull into a plastic P17 that has been sitting in my hull for over a decade?

(I get the feeling that these "P17" through-hulls are ubiquitous, and that there is no need to swap the actual through-hull just because a new transducer has been bought, but I am not sure.)


Also, what does the "DST 800 P120" nomenclature mean? I understand that 'DST' is Depth, Speed, and Temperature, but what about the '800' and the '120'?

Thanks.
__________________

LongRange is offline   Reply With Quote
Old 24-06-2018, 04:11   #3
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 13,697
Re: Airmar 2 inch thru-hulls: brand-agnostic?

Not sure if all same size transducer are exactly compatible in the installation but I was able to replace both of my ancient Datamarine transducers twice, keeping the same through hulls, threaded ends, etc.

The second swap was to a Raymarine ST40 system that I'm still using so I know at least some Raymarine is exactly the same physically as some other models.
__________________
The water is always bluer on the other side of the ocean.

Sometimes it's necessary to state the obvious for the benefit of the oblivious.

Rust is the poor man's Loctite.
skipmac is offline   Reply With Quote
Old 25-06-2018, 08:41   #4
Registered User

Join Date: Dec 2015
Location: Fort Pierce Fl
Boat: Gulfstar 36 MS
Posts: 174
Re: Airmar 2 inch thru-hulls: brand-agnostic?

They are the same transducer and both NMEA compliant. For verification call Gemeco at 1 803 693 0777. They are the Maretron people!
Outlaw7 is offline   Reply With Quote
Old 23-07-2018, 01:44   #5
Registered User

Join Date: Feb 2017
Location: Med
Boat: Dufour 455 GL
Posts: 142
Re: Airmar 2 inch thru-hulls: brand-agnostic?

I found out the hard way that the answer to the original question is "NO".

Although the outside 2" thread of the newly-purchased Airmar "Navico" DST800 is the same diameter as the old Raymarine ST800, the internal sleeve of the old ST800 is narrower than the body of the new DST800.

In other words, if the ST800 is removed from the through-hull, the DST800 is too wide to fit in its place. Only a few millimetres difference, but it might as well be a metre.

So now I will have to get the boat lifted out, and the new transducer installed with its own (internally wider) through-hull. Lesson learned, and I hope this is useful to others considering the same swap. No doubt there are combinations that are compatible/swappable, but just because it's an Airmar through-hull with a 2" outside diameter does NOT mean it will take other Airmar transducers that also come packaged with a 2" through-hull.

Thanks to everyone who responded. Much appreciated.
LongRange is offline   Reply With Quote
Old 23-07-2018, 01:56   #6
Registered User

Join Date: Aug 2011
Location: Melbourne Australia
Boat: Paper Tiger 14 foot, Gemini 105MC 34 foot Catamaran Hull no 825
Posts: 1,958
Re: Airmar 2 inch thru-hulls: brand-agnostic?

Dont you just love, Inbuilt Obsolesence,
I got a new depth sounder but with out the screwed collar,
The collar I have wont go on the new one, My one has a lip on it,
At least you have the numbers for yours, I dont,
Mr B is offline   Reply With Quote
Old 23-07-2018, 12:50   #7
Registered User

Join Date: Dec 2015
Location: Fort Pierce Fl
Boat: Gulfstar 36 MS
Posts: 174
Re: Airmar 2 inch thru-hulls: brand-agnostic?

I take it you did not call Gemeco?
Outlaw7 is offline   Reply With Quote
Old 23-07-2018, 15:40   #8
Registered User

Join Date: Feb 2017
Location: Med
Boat: Dufour 455 GL
Posts: 142
Re: Airmar 2 inch thru-hulls: brand-agnostic?

Quote:
Originally Posted by Outlaw7 View Post
I take it you did not call Gemeco?
No, I did not. I have never purchased anything from Gemeco, and I am very unlikely to do so in the future, given the boat is in the Med. Under those circumstances I did not want to seek favours or waste their business time.

It's all good. The new transducer was getting installed anyway, eventually, so the only thing I lost was the gamble that it could be done without pulling the boat out.

Thanks again.
LongRange is offline   Reply With Quote
Old 23-07-2018, 15:54   #9
Registered User

Join Date: Feb 2017
Location: Med
Boat: Dufour 455 GL
Posts: 142
Re: Airmar 2 inch thru-hulls: brand-agnostic?

Also, it occurred to me that had the new transducer body been slimmer than the old one, it would probably fit into the internal sleeve of the through-hull, and be deprived of support it needs down on the lower end where it exits the hull. All the stress would have been on the top of the plastic thread of the through-hull, and that could easily lead to cracking.

Another crisis averted
LongRange is offline   Reply With Quote
Old 27-01-2019, 11:25   #10
Registered User

Join Date: Nov 2015
Boat: R&C Leopard 40
Posts: 254
Re: Airmar 2 inch thru-hulls: brand-agnostic?

I wish I would have read this earlier. I just tried dropping in a new DST Airmar into the housing of the old 20-399-01 and same as you, I found the new model to be thicker than the old model. I ran the wire with some trouble, and split my head open during the cleanup process. Not a good day
__________________
-Chris
FlyingScot is offline   Reply With Quote
Old 27-01-2019, 13:25   #11
Registered User

Join Date: Jan 2012
Location: Full time cruisers
Boat: Krogen 42
Posts: 332
Re: Airmar 2 inch thru-hulls: brand-agnostic?

If it is just a bit of clearance could you use a brake cylinder hone or is there not enough thickness?
__________________
----------------------------------
Terry
meridian28 is offline   Reply With Quote
Old 27-01-2019, 16:44   #12
Registered User

Join Date: Nov 2015
Boat: R&C Leopard 40
Posts: 254
Re: Airmar 2 inch thru-hulls: brand-agnostic?

Quote:
Originally Posted by meridian28 View Post
If it is just a bit of clearance could you use a brake cylinder hone or is there not enough thickness?
Mine is all plastic.
__________________

__________________
-Chris
FlyingScot is offline   Reply With Quote
Reply

Tags
hull

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mains agnostic battery charger + inverter keelsidedown Electrical: Batteries, Generators & Solar 2 24-06-2017 23:47
For Sale: AirMar Tri-Ducer DST800 - brand new - $225 memelet Classifieds Archive 0 06-07-2012 20:02
Thru-Hulls in Cored Hulls ggray Construction, Maintenance & Refit 7 22-12-2009 08:07
Getting rid of thru-hulls (in GRP) Weyalan Construction, Maintenance & Refit 2 05-07-2006 22:42
Thru-Hulls markpj23 Construction, Maintenance & Refit 9 13-02-2006 20:35



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:08.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.