Boat out of the water - bonding issue any recommendations?

[kashurst]

Boat is out of the water this week for the usuals, however last summer I had the hull extension re-fitted and reinforced with some stainless steel tubes. Neither the fitter, sealine locals or myself could decide quite what to do about bonding the steel tubes. Should I: connect them all together internally and connect into the main bonding wiring, just connect them together and nothing else but fit an anode on them, or leave them electrically isolated as they are now?
thanks

PS else having problems with photobucket images or am I being thick today?

 

[Tranona]

Assuming your extension is GRP can't see any reason why you should require any anodes. The tubes are not in contact with any other metal so there can't be any galvanic action to protect against. Also assuming they are 316 stainless, but if they are 304 an anode will not prevent any corrosion. The only possibility is crevice corrosion in the threads of the fastenings, but again an anode won't do anything for this.

Anodes are required when there are two different metals in contact with each other in water - for example shafts and props.

 

[VicS]

As Tranona says if not connected to other metal parts no anode(s) should be necessary


Seal fasteners to prevent crevice corrosion. No crevice = no crevice corrosion!


Trouble with photo bucket may be because you have "link back to albums" selected

See my post in this thread http://www.ybw.com/forums/showthread.php?356455-Photobucket-problems-Help-advice-needed&p=4135626

You presumably wanted to show

 

[kashurst]

thanks for the replies - fixed the photobucket issue too! cheers

 

[Alboretto]

I am interested to earn why you would fit hull extension plates. Do they have any effect on the tabs and thruster?

 

[kashurst]

Its a trick sealine and others do to extend the length of the hull to try and optimise the performance. If you increase the length of the planning surface the fuel consumption apparently improves a bit. Sealine use a simple fibreglass extension as it simplifies the hull tooling at the transom whilst permitting a bit of tweaking on the first finished boat. If you look at the transom of a fairline or princess the design is rather more sophisticated to incorporate spaces and apertures for the rudder stocks, trim tabs etc. From a design for manufacture perspective its probably easier and quicker to assemble a sealine- although non-sealine fans would probably think its a bit naff (it is really). I have had other sealines with this design with no problems but the one on the t50 really needs some big vertical ribs adding to the shape to stiffen it up - hence the reinforcing I've fitted to mine