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Old 28 November 2004, 14:46   #11
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Country: UK - England
Town: Poole
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Length: 6m +
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Rogue,

I had my A-frame fabricated and fitted it myself.
It is a double 2" frame.

The back tube bolts directly through the transom utilising the existing U-bolts with a third bolt either side.

The front tube is bolted through the deck with 2xM10 bolts and nylock nuts either side. To gain access under the floor, I fitted 2x4" round inspection hatches just in board and toward the stern of the mounting point. They are completely watertight.
We use the frame to wakeboard so its pretty strong.

Suggest this is the way at least a double frame should be fitted or even better drill right through the floor and hull and plate on the outside. Didn't fancy this method personally but it would certainly be substantial!

Hope this helps...

Nick
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Old 28 November 2004, 14:52   #12
DGR
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Boat name: Blue Marlin
Make: Ribcraft
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Rogue,

Ooops...mines a 7.8 - I assumed it had a plate in it!! All I can see from the outside is a hex bolt-head (which looks substantial) - I thought it would be more than a rawl-plug? How does that hold the a-frame? If it's the same as yours - how are you going to fix it?

Cheers,

Dylan...
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Old 28 November 2004, 14:57   #13
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I think it might be going back on with the help of 2 4 inch inspection hatches. Pete 7 has some photos of the original fastenings and they were a surprise to me. Not as much as the A frame ripping off the back of the boat however!
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Old 28 November 2004, 16:47   #14
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Seems the only thing in the deck is a sort of brass collett about 1cm across and 2 cm deep which that big bolt screws into. I am suprised I thought Ribcraft would do something more substantial than this. In addition because they didn't line the A frame legs up with the deck they had to put a wooden wedge in to take up the gap.

Pete
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Old 28 November 2004, 17:15   #15
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Stuart

Can't believe a manufacturer can get away with such poor design, I think the only way is to get the biggest backing plate under the deck and bolt through into it. The Inspection hatches sound like a good idea but will limit your backing plate to 4 inches in one direction, they are available in 6 inch which would be better, as would getting the nuts welded onto the backing plate to save hassle when fitting. It may also be worth cutting the ends off the A-frame and getting them welded back on at the right angle.
The wooden blocks are probably what caused the failure. They most likely soaked up water got soft and allowed an amount of movement that gradualy weakened the mounts.
If you need any help just shout.

Nasher.

By the way, I promise I'll get those kids life jackets back to you very soon.
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Old 28 November 2004, 18:24   #16
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The offer of help is much appreciated and may well be accepted.!

The wooden wedges seemed to be the actual fixing point.

To be honest the failure wasn't caused by the weak fitting points It was caused by me doing something that caused the failure. However I am generally impressed with the strength of the Ribcraft and wasn't really having a go.

I have been in the shed making up some new blocks sand will epoxy themon tomorrow! I wont need the kida life jackets until the next season so keep em for the winter if they are going to get used
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Old 01 December 2004, 01:42   #17
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Hi ya Stu..

Who's boat is this for? Have you got yourself another one???
Well made it back from sea.. just.. Back alongside in Singapore..
How's Big Billy doing? and the storage idea?
Alex
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