Fixings into GRP

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Sailfree

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New dinghy will need to go on snap davits on sugar scoop stern on my Jeanneau 43 DS. Cockpit locker will only take a ringtail inflatable as so small.
Problem is fixing them on as impossible to get to underside of GRP.
Obviously can use large size self tapers and Sika flex to use as adhesive/sealant.
Wondering whether some form of cavity wall (toggle bolt) will be better.

Anyone with experience of this problem?
 
Toggle bolts won't spread the load - you need to get in there somehow and get some backing plates put in.

Is it 100% inaccesible or just very hard to get at?
 
Comrade Red said:
Toggle bolts won't spread the load - you need to get in there somehow and get some backing plates put in.

Is it 100% inaccesible or just very hard to get at?
Click to expand...

It's accessible if I take the deck off!!

Yes 100% inaccessible.

Over the years many have tried to get access to back of engine panel, look to fit davits at high level and now to try to fit snap davits . It's the problem with trying to post fit on production boats where they pack so much in. 43' and sleeps 10 in 4 cabins plus saloon but **** to access certain areas and small cockpit lockers!
 
Cut 5" round holes for access, fill them with dinghy hatches with pockets. Useful, a neat finish, permanent access to the fasteners and backing pads.
 
Sailfree said:
New dinghy will need to go on snap davits on sugar scoop stern on my Jeanneau 43 DS. Cockpit locker will only take a ringtail inflatable as so small.
Problem is fixing them on as impossible to get to underside of GRP.
Obviously can use large size self tapers and Sika flex to use as adhesive/sealant.
Wondering whether some form of cavity wall (toggle bolt) will be better.

Anyone with experience of this problem?
Click to expand...
For potential high loading such as davits you really do need load-spreading inside the hull: if necessary creating access for throughbolts and fair sized backing pads via new access hatches - all sorts and qualities available but http://www.seaspan.co.uk/acatalog/acchatch.jpg is typical.

Unusual of Jeanneau to make internal access truly impossible: on my 35 a gymnastic dwarf can get to most areas with only a few aches and pains afterwards.
 
jerrytug said:
Cut 5" round holes for access, fill them with dinghy hatches with pockets. Useful, a neat finish, permanent access to the fasteners and backing pads.
Click to expand...

Good idea but not sure that's possible as sugar scoop stern due to curve. Not sure of safety implications as boat would risk sinking if hatch failed so close to waterline in waves.

Some form of secure hatch worth considering but I don't think the circular dinghy ones would be secure enough.

Definitely consider that higher up to access back of engine control panel.
 
For clarity I gave up on idea of davits due to load but now considering snap davits where load if I understand it correctly is mostly in swinging dinghy up as once lifted weight will be vertically down on sugar scoop stern.

Anyone fitted snap davits?
 
jwilson said:
For potential high loading such as davits you really do need load-spreading inside the hull: if necessary creating access for throughbolts and fair sized backing pads via new access hatches - all sorts and qualities available but http://www.seaspan.co.uk/acatalog/acchatch.jpg is typical.

Unusual of Jeanneau to make internal access truly impossible: on my 35 a gymnastic dwarf can get to most areas with only a few aches and pains afterwards.
Click to expand...

Interestingly, many of extras who played the parts of the Munchkins in "The Wizard of Oz" went on to be employed by Consolidated Aircraft. They fixed components inside the wings of Liberator bombers. Consequently, modern-day restoration of these planes to flying condition is extremely difficult. Sorry about the thread-drift, but I've got to display this trivia somewhere:)
 
Sailfree said:
For clarity I gave up on idea of davits due to load but now considering snap davits where load if I understand it correctly is mostly in swinging dinghy up as once lifted weight will be vertically down on sugar scoop stern.

Anyone fitted snap davits?
Click to expand...

There will be considerable loading from windage, and waves if you are unfortunate enough to be sailing downwind in heavy enough weather.
 
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