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Old 08 November 2013, 10:58   #1
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Deck Matrix

I want to put in a deck matrix to allow for removal jockey seat, bench seat bottle rack etc. I plan on using 4 or 5mm thick Stainless steel plate. Two plates each 100mm wide by 800mm long which will be joined togeter with three 50 mm Stainless stringers. This unit to have 7 blind M 8 nuts on each plate i.e. 14 blind nuts in total. The unit to be sikaflexed and screwed down at 100mm C/C. I then intend to cover the unit with 4-6 layers of 300mm CSM and then flow coat the deck. This arrangement will give me 8 bolts for a single jockey (4 each side) or 12 bolts for a Double jockey and 6 bolts for a bench seat. I intend to use bolts like this A2 Stainless Metric Studding Connector Nuts (DIN 6334) on the under side of the plate with the ends blanked off.

A plan view of the deck matrix shown below





Your thoughs on this arrangement please. The last thing I want is a jockey seat to come away from the deck. I think that this may have been the failure mechasim that caused the failure of the jockey seat on MustRibs gemini in the RI 2013 event earlier. If I am mistaken Must rib then I am sorry in advance

TSM
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Old 09 November 2013, 04:12   #2
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Will it ever be used with just an open deck? it sounds like a trip hazard to me. Is the deck ply, 'solid' grp, or got a core?
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Old 09 November 2013, 06:19   #3
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deck is grp on plywood under which there is some kind of foam. The deck would be used as an open space for diving
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Old 09 November 2013, 17:34   #4
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Your thoughs on this arrangement please. The last thing I want is a jockey seat to come away from the deck. I think that this may have been the failure mechasim that caused the failure of the jockey seat on MustRibs gemini in the RI 2013 event earlier. If I am mistaken Must rib then I am sorry in advance

TSM



TSM... nothing to apologise for.
Events all happened in a split second, but the boat was extremely on its beam, after the crest. I am pretty certain the seat parted company with the deck as a result of some big lardy bloke being sent sideways with a violent snapping motion as opposed to seat detachment being the reason I went sideways. The seat didnt have enough sideways motion to be ejected from the boat, and if I recall, the damage to the deck was more in line with a levering motion. Anyway, I wouldn't skimp on the pate as regards the lay up. I think my seat was subjected to an extreme force, and as Poly pointed out, seats detaching from the floor in the circumstances is not unusual.
btw I cap the open ununsed big heads in the floor with a Hex dome head bolt, and these all but disappear into the Treadmaster, hardly standing proud of it at all.
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Old 09 November 2013, 18:17   #5
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Quote:
Originally Posted by MustRib View Post
I think my seat was subjected to an extreme force, and as Poly pointed out, seats detaching from the floor in the circumstances is not unusual.
I might well have said its not unheard of - it doesn't mean its right (of course even if the seat stays put it doesn't ensure that the helmsman/crew do too).

There have been a few threads on here in the past with people looking to put removable fixings in. Don't recall anyone going as complex as you are proposing. If the deck design supported it I'd have though a small flush hatch to put bolts in from underneath was the 'best'.

Have a look at: Removable seats / spec questions
Name needed for deck fittings
Fitting Seats
DIY Jockey Seat
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Old 10 November 2013, 04:11   #6
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My old 4m Searider Deluxe had blind fastenings embedded in the floor for securing the seats to.
There were also some blanked off ones, presumably for fitting a console if the boat were specd as a rescue version.

Poly, I'm not sure having hatches in the deck to allow through bolting will be practical.
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Old 10 November 2013, 05:29   #7
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Poly, I'm not sure having hatches in the deck to allow through bolting will be practical.
4" inspection hatch like this: DINGHY/YACHT Inspection hatch - WHITE | eBay

In the middle of the seat/console (provided you can get to the middle of the seat/console) - would have no traffic so very little abuse) and should let you get in to put the nuts and big washers on...

But does depend what the structure under the deck is like.

They are pretty robust (there are some that are a bit more flexible) but the one I linked to is "solid". They keep water out well on sailing dinghies so would be happy with the seal on a SR4 deck.
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Old 10 November 2013, 05:46   #8
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I was actually thinking something that was genuinely flush and in steel - but I've just looked at the price

There is no benefit to a slightly raised hatch - it would need to be recessed to be flush; I'm thinking tripping, stubbed toes, comfortable under bare foot - when the seat / bottle rack is not fitted.

Quote:
a SR4 deck
its for a valiant.
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Old 10 November 2013, 06:00   #9
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There is no benefit to a slightly raised hatch - it would need to be recessed to be flush; I'm thinking tripping, stubbed toes, comfortable under bare foot - when the seat / bottle rack is not fitted.
Hadn't really understood. (shut it!) I took it the desire was just to have some nuts on the underside, not to be changing boat config.

Quote:
its for a valiant.
Whatever
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Old 25 November 2013, 15:39   #10
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Placed the order for the ss deck matrix. cost circa 450 euro. lets see if the experiment works.
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