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Old 24 February 2011, 05:28   #1
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Fixing Sib A Frame

Hi Guys,

I have made a small A frame for my SIB just for nav lights and safty box and i need some advise on fixing it to the SIB. Its made from strong 30mm ALI tubing.

I have seen many pictures on the net which dont show much on the fixing used to sercure the frame to the transom.

Q, Does the frame get installed on the inside of the transom or the outside ?

Q, If installed on the inside do i attach to the ALI floor ?

Q, What fixings are used to sercure the frame ?

I hope some one can help

Many thanks,

Matt.
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Old 24 February 2011, 05:49   #2
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Frames are attached to the inside of the transom and if a single arch then usually to the transom and not the deck.
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Old 24 February 2011, 06:50   #3
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Thanks for the speedy reply Channel Ribs,

So to the inside of the transom and not to the floor as only one arch.

Would i fix to the tramsom with somthing like this and backing plates ?
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Old 24 February 2011, 09:06   #4
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I was also thinking about a very small A frame for my new SIB.

Would a couple of modified bench clamp type things do on a small light A frame, to clamp to inside of transom - so that it is nonpermanent and easily removed??

Also means I dont have to drill holes in transom as I WILL ruin it, no matter what.
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Old 30 October 2011, 19:16   #5
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what if you are trying to provide some transom bracing? I have a futura mk2. from what I have read these boats run risk of the transom tearing from the tubes. what if someone was to build a double frame arch, then connect to the aluminium floor then to the inside of the transom? Would this not work? I am very curious and might attempt the fabrication. what are your thoughts?
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Old 31 October 2011, 03:54   #6
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If it is lightweight then then the best idea would be to modify some simple clamps/brackets from some other piece of equipment or fitting that allow it to be clamped over the top of the transom each side. I would think this is essential as you will want to remove it for transport or deflation quickly and easily.

Or even better a simple bolted on socket each side with lock pin - had this on my RIB.
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Old 31 October 2011, 03:57   #7
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See pic (obviously on the SIB this would be much lighter weight):
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Old 02 November 2011, 23:10   #8
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If this is only a lightweight arch used for lights, not support for heavy use, then you could either use the appropriate sized pvc pipe, attached with screws through one wall and slide the arch into it. Another suggestion would be simple pipe clamps.
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