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Old 27 November 2004, 14:18   #1
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A Frame fixing

Does anybody now how A frames are generally fixed to decks on new boats
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Old 27 November 2004, 14:39   #2
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Why won't are you up to now ?

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Old 27 November 2004, 14:54   #3
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Old 27 November 2004, 15:12   #4
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Quote:
Originally Posted by Rogue Wave
Does anybody now how A frames are generally fixed to decks on new boats
not that well in most cases if you want a job done well do it your self

most fix to the transom with bolts and the floor with self tapping screws don,t see how you would bolt them in to the floor unless your have access under the deck

mine was just bolted to the transom with 20mm washers to spread the load
they have now been replaced with 60mm washers and square plates

dan
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Old 27 November 2004, 17:14   #5
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Mine is a double A-frame. The back legs are bolted through the transom and the front legs are bolted through the hull. You can see the exterior stainless plates and bolts when you get down underneath the boat. Makes the installation very strong/rigid and reinforces the transom-hull join also. I understand Ribcrafts frames are bolted like this also. If you want pictures just let me know.
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Old 27 November 2004, 17:24   #6
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I do so wish that Ribcraft were fastened in the manner you described. But the one I have been using lately seems to be fastened in a very much different manner. I like the through deck fixing myself
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Old 27 November 2004, 17:32   #7
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Sorry, I should correct myself so. Most Ribcrafts are done this way. DGR posted back along that his was and every Ribcraft that I've ever seen has been like this too. Thru deck sounds good but you're gonna need to cut a hatch to do that which leaves you with more problems, ie: waterproofing the hatch. As its at the transom this is where most water collects overnight, you'll have to pump out the water that has seeped through the hatch before you go out which is a bit of a pain.
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Old 28 November 2004, 11:16   #8
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Bigheads?

Hi Stuart,

Not the answer to your question but for others guidance the Avon method of fixing the transom tie bars to the floor is to fix a "Bighead" fastener through a piece of plywood and to then laminate that to the floor. That way you get almost a bolted connection without having to drill through the floor or hull.

A bighead is basically a stainless steel plate with a stud welded / fastened to it. These can then be embedded into a GRP structure.

The A frame on the Avon is bolted to the transom only, as is the one on the Scorpion.

The bighead route could work well on a Ribcraft as it should be relatively easy to match the finish on the floor?
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Old 28 November 2004, 14:28   #9
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Ribcraft...

Swginn is right - my A-frame is bolted through the deck - but it is the honking great big 2" tubed double one - so the smaller ones might still be attached differently on other Ribcrafts.
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Old 28 November 2004, 14:45   #10
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Ahh. I think i am talking at cross purposes to the rest of you. (that's never happenned before ) when people say through deck I envisaged a bolt going through the deck and into a plate shimilar to the Bighead plate Duncan mentionedl. The A frame I have the problem with is a double framed job on the back of a 7.8 and it was bolted through the deck using something similar to Rawlbolts

It think it might be going back on using a bighead plate!
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