Reply
 
Thread Tools Search this Thread
 
Old 30 April 2008, 14:22   #1
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
Bonding in consoles

I am looking at fixing in my new console and for various reasons am considering bonding it in. Assume I know nothing about working with Glassfibre (not very far from the truth), how would I do this and what would I need to make a good job of it?
__________________

__________________
BruceB is offline   Reply With Quote
Old 30 April 2008, 15:14   #2
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Just be aware that ultimately the bond between your consol and the boat will be the fibreglass cladding to plywood deck surface and fibreglass to wood is not always the best bond. The fibreglass cladding will only be about 2mm thick and you will need to take some of that back in your preparation.
__________________

__________________
JW.
jwalker is offline   Reply With Quote
Old 30 April 2008, 16:12   #3
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Bonding is good, but I would also use a mechanical way of securing too, like using ss wood screws and penny washers
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 30 April 2008, 16:30   #4
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
I looked at fixing in my console and am a bit worried at the sides that I will end up puncturing the outer hull with the fixing screws, the console is the full width of the inner space.
I was considering grinding off the external fixing flange on both sides and leaving it front and rear. Then screwing the two remaining flanges to the deck with sikaflex and normal and then bonding the whole console to the deck on the inside.
Not sure yet which way to go but I know I definitely don't want screws sticking through the hull.
__________________
BruceB is offline   Reply With Quote
Old 30 April 2008, 16:52   #5
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
I would hazard a guess that the deck will be at least 19mm thk so 19mm screws won't stick though. I'd use the longer ones inboard and shorter ones around the outside. The other option is to increase the footprint of the console by making an internal wooden ring that fits just inside the console, if this was bonded too it would make for a much better constuction because of the increased surface area to deck.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 30 April 2008, 17:04   #6
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
The console end right at the join between the deck and hull where it looks like the deck is tapered to fit to the angled hull shape. I will need to carefully measure but rough and dirty measurements tonight (it was raining!) look like the screws go through the tapered edge of the deck and will end up outside the hull, it doesn't look much thicker than the thickness of the outer hull at this point which seems to be around 10-12mm of Glassfibre.
I need to measure more carefully to be sure (quite hard to do so and match inside and outside measurements on both sides of tubes) but I am looking at a backup up plan just in case.
The really worst case is to move the console back to where the hull is wider but this would mean sitting very far back in the hull.
__________________
BruceB is offline   Reply With Quote
Old 30 April 2008, 17:21   #7
RIBnet supporter
 
Erin's Avatar
 
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,830
I would screw it down if you can, but if not, then if it's properly bonded down to the deck with f/glass then it won't be going anywhere. The chances of you peeling a whole layer of glassfibre off the top of the plywood deck in one go are pretty slim. The sheer surface area involved and the rigidity of the console would make it nigh on impossible without some tremendous force being applied.
__________________
Erin is offline   Reply With Quote
Old 30 April 2008, 17:43   #8
Member
 
Country: UK - England
Town: Poole
Make: Aquaflyte
Length: 6m +
Engine: Merc 90 2Str
Join Date: Feb 2006
Posts: 414
Quote:
Originally Posted by Erin View Post
would make it nigh on impossible without some tremendous force being applied.
Something like the force of several tons of water as you stuff the bow at 25 kts (or more) ... perhaps ...

Granted, we all hope for Bruce's sake that this is unlikely but the old line of "hope for the best, plan for the worst" has a lot of merit. IMHO the risk is not of full shear debonding, but more of a peeling off debonding. Given the height of a console, leverage is going to be an issue. Therefore anything to stop any lifting round the edges (like the judicious application of screws and penny washers as suggested by Hightower) has to be a good idea.

I'd just feel happier with belt AND braces
__________________
Andrew

Also a member of the ebay Blue RIB cover club
AndrewH is offline   Reply With Quote
Old 30 April 2008, 17:52   #9
Member
 
Bigmuz7's Avatar
 
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,068
I asked my dealer about this on my last rig out, but he poo poohd it and suggested just bonding to the deck and screw fixing would be fine. To his credit on my last two rigs this has worked fine. I still feel that a grp flange round the console base would have been better though .. not least of all to stop the dreaded water ingress to the under deck. Next time I will demand it !!
__________________
Bigmuz7 is offline   Reply With Quote
Old 30 April 2008, 17:55   #10
Member
 
Country: UK - Scotland
Town: Inverness
Boat name: none
Make: none
Length: 5m +
Engine: none
MMSI: none
Join Date: Mar 2007
Posts: 1,908
How is it screwed to the deck with no flange?
__________________

__________________
BruceB is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 16:04.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.