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 01-01-2019, 21:05   #1
Registered User

Join Date: Feb 2018
Posts: 10
B&G Plastic Through Hull?

My boat is a Brewer 44 Cutter and I am looking to install a new nav system. B&G looks to be the system but I am curious about the Plastic through hull for the Depth Sensor (DST800). Should I be concerned about plastic vs brass? Nothing else on this boat is plastic and I intend on extend cruising on this boat.
Thoughts?
__________________

wscotterwin is offline   Reply With Quote
Old 01-01-2019, 21:15   #2
Registered User

Join Date: Feb 2018
Location: Maryland
Boat: Express 30
Posts: 28
Re: B&G Plastic Through Hull?

Don't worry about it. It's probably made using engineering plactic. Not the same stuff as your toothbrush.
__________________

Ringmaster is offline   Reply With Quote
Old 02-01-2019, 12:53   #3
Registered User
 
Orion Jim's Avatar

Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 1,411
Images: 7
Re: B&G Plastic Through Hull?

Quote:
Originally Posted by wscotterwin View Post
My boat is a Brewer 44 Cutter and I am looking to install a new nav system. B&G looks to be the system but I am curious about the Plastic through hull for the Depth Sensor (DST800). Should I be concerned about plastic vs brass? Nothing else on this boat is plastic and I intend on extend cruising on this boat.
Thoughts?
It’s just an Airmar unit. You can specify it in either plastic, bronze, or stainless steel.

http://www.airmartechnology.com/uplo...res/DST800.pdf
Orion Jim is offline   Reply With Quote
Old 02-01-2019, 14:36   #4
Registered User

Join Date: Feb 2015
Posts: 687
Images: 1
Re: B&G Plastic Through Hull?

I think only the plastic tube has the build-in flap that closes when you remove the transducer core, thereby sorta kinda allowing you to replace it while in the water. And you will need to replace it when it breaks, typically with a loss of temp in 1-2 years.
__________________
www.MVTanglewood.com
tanglewood is offline   Reply With Quote
Old 02-01-2019, 20:50   #5
Registered User
 
Orion Jim's Avatar

Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 1,411
Images: 7
Re: B&G Plastic Through Hull?

Quote:
Originally Posted by tanglewood View Post
I think only the plastic tube has the build-in flap that closes when you remove the transducer core, thereby sorta kinda allowing you to replace it while in the water. And you will need to replace it when it breaks, typically with a loss of temp in 1-2 years.
Only the housing material differs, not the design. Plastic, bronze, or stainless, all have the “flap”.
Orion Jim is offline   Reply With Quote
Old 02-01-2019, 21:15   #6
Registered User

Join Date: Oct 2015
Posts: 1,162
Re: B&G Plastic Through Hull?

Quote:
Originally Posted by wscotterwin View Post
My boat is a Brewer 44 Cutter and I am looking to install a new nav system. B&G looks to be the system but I am curious about the Plastic through hull for the Depth Sensor (DST800). Should I be concerned about plastic vs brass? Nothing else on this boat is plastic and I intend on extend cruising on this boat.
Thoughts?
First, none are made of "brass", rather bronze.

Many, many boats use "plastic" thruhulls without problems. The don't corrode, or age in any significant way. They also don't blow out if the boat is hit by lightening. Marelon thruhulls and seacocks are very common on long distance cruisers. In fact metal boats will usually use them to avoid corrosion issues.

The only type of boat that should NOT use plastic thruhulls are those made of wood. Swelling wood can crush the plastic. I would avoid them in an engine room, just because they don't do well in a fire, but anywhere else on a boat, go for it.

But if you really are uncomfortable with plastic, you can get it in bronze or stainless as well.
billknny is online now   Reply With Quote
Old 03-01-2019, 06:21   #7
Registered User

Join Date: Feb 2015
Posts: 687
Images: 1
Re: B&G Plastic Through Hull?

Quote:
Originally Posted by Orion Jim View Post
Only the housing material differs, not the design. Plastic, bronze, or stainless, all have the “flap”.

OK, then maybe it's the long stem that doesn't have a flap? I had a bronze tube and it didn't have a flap. But it was also a long stem version.
__________________
www.MVTanglewood.com
tanglewood is offline   Reply With Quote
Old 03-01-2019, 07:28   #8
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Boat: Bestevaer.
Posts: 11,297
Re: B&G Plastic Through Hull?

An option is to install the transducer in a waterproof area. Often it is possible to have a waterproof locker under the V berth. The top does not have to be watertight, it just has to be higher than the waterline at that point (which is not very high).

The risk of the transducer leaking is small but they are often in the bow area where the risk of striking underwater debris is highest. The plastic transducers can also be cracked by poorly placed travel lift straps.

I am surprised more dedicated long distance boat builders don’t take the trouble to incorporate these simple measures at the build stage.
__________________

noelex 77 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
Plastic through hull replacement? Rusty123 Construction, Maintenance & Refit 16 18-07-2017 03:02
Plastic seacock & thru hull fitting leaking ipsum Plumbing Systems and Fixtures 3 13-09-2015 02:39
Measure speed through water without making hole through hull. Lars_L Construction, Maintenance & Refit 29 26-03-2015 12:58
running plastic tube through bulkhead? Tom1340 Construction, Maintenance & Refit 10 28-04-2013 16:29



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:24.


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.