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Old 22 November 2011, 16:19   #1
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A Frame design for a 4.8m RIB

Hi

I get a fair bit of SS fabrication work done and am very friendly with the them, they will rattle me out an A Frame (I'll buy the metal!).

Any handily made tidy looking designs about? A pic would be useful if anyone can point me in the right direction. They are making me a jockey seat frame out of 1" 316 SS, I'm guessing that would be too flimsy for an A Frame, any opinions?

(Primarily want one cos they look cool but will stick nav lights on in case I end up working on my DT55 in the Irish Sea in the dark!)
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Old 22 November 2011, 17:53   #2
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1" OD would be ok for a braced double frame, or 2" OD for a chunky single section also looks good.

Make sure you design it tall enough to allow enough room to remove the outboard lid with the motor trimmed down, if you plan on doing any at-sea maintenance.
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Old 22 November 2011, 17:56   #3
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Old 22 November 2011, 17:59   #4
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Also make sure your nav lights are high enough not to be obscured by the bow if the boat, console or people stood driving etc.

On a lot of boats you can't see the nav lights when they are coming towards you half on the plane with the bow in the air and people stood up. Kind of defeats the point of having lights in the first place of people can't see you coming towards them!

Sent from my iPhone using Rib.net
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Old 22 November 2011, 18:32   #5
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cheers chaps - good tips there!
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Old 22 November 2011, 22:30   #6
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If the guys you're working with can do some bending, you can flare the bottom of the A-frame out over the tubes. That will put your lights further out to the sides, and give you more room to lean over the transom, should you need to replace or clear a prop while on the water.

jky
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Old 23 November 2011, 03:18   #7
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This is the double one I had for my 4.8m Tornado.
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Old 23 November 2011, 03:19   #8
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From the stern with electrics fitted....
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Old 23 November 2011, 05:06   #9
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I had one made up to my drawing & I'm very happy with the result
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Old 23 November 2011, 05:24   #10
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like all of those! Decisons decisons! I am calling in to see them later about some paid work so will print a few pics out and see what is easiest for them. I like the ways yours just mounts on the transom Jizm as avoids any deck issues.

Do you tow skiers etc from the tow ring on yours Nick?
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