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Old 01 August 2016, 05:34   #1
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What happens if I fix my sib's floors?

This is my first season with my Zodiac MK3 Grand Raid 1986.
My stingers is from wooden and has some crack on it, and there is too much bending and streching on the floors during the cruise.

The question to experts is What if I fix the first 3 floors with an aluminium pipe (dia:40mm 5mm thickness).

According to your valuable comments thinking about to fix the 4. floor and carry up the floors to the tubes as you can see in the pictures. The red line is the aluminium pipes screwed to the floors.
The black lines are the flat ropes that tenses the pipes and connected floors to the tubes.

Note: I roll up and carry my sib almost never in a year
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Old 01 August 2016, 07:35   #2
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Before making any changes to the way you fix the flooring, make sure you have the tube pressure correct, both before you get in the water, and after approximately 1 hour after the boat has entered the water.


Always keep tubes at optimum pressure, as this aides the job the stringers are doing !!


Steve
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Old 01 August 2016, 10:23   #3
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Quote:
Originally Posted by berat View Post
My stingers is from wooden and has some crack on it, and there is too much bending and streching on the floors during the cruise.

The question to experts is What if I fix the first 3 floors with an aluminium pipe (dia:40mm 5mm thickness).
Aluminum does not do well with any repeated flexing. Eventually it fails due to stress cracks.

Better to address the cause of the flexing first (likely your solution is in the post just above) and see if that cures your problem.

But, if you do go the bracing route, rather than tubular, I'd look for something like an extruded I-bar, which will have less flex for a given force. Should last a little longer.

jky
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Old 01 August 2016, 11:54   #4
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Have some new stringers made from wood will be better not a big job for a carpenter

Cheers
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Old 02 August 2016, 04:06   #5
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steco1958 Hi Generally my mistake can be inflate the tubes on the hot sand and then never check the pressure on the water. I'll check it thanks

jyasaki Hi I'check the pressure if it continue to bend I have to fix the first 3 floor with tubular which I have already had. I looked for sigma profile but could find the tubular pipe.

jeffstevens763@g Hi I showed a sample stinger to a carpenter to get a prize, that was a lot more than original aluminium stingers
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Old 02 August 2016, 04:23   #6
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Berat if you put the tubes on top of the floor in place of the stringers which should be on the side you will find the floor edges with no stringers on are very sharp so could wear through a tube.

So you need to leave the stringers in place with the tubes as reinforcing... and repair the cracked one so it can't damage the tube.
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Old 03 August 2016, 09:56   #7
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Go to a machine shop and get some aluminum folded into a triangle. It should not cost much to make some. I had some made for my new wooden floor. I reckon a place would not charge more than 70 for the two stringers.
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Old 03 August 2016, 12:13   #8
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My thoughts are slightly different from some of the other guys..so take them with a pinch of salt if you wish.

I use my wooden floored 4.3m Sib in any weather..therefore I know how much a pounding the floor gets in a good chop. There is no way I would trust home made repairs to my stringers. If they break at sea in a bad weather day..and even the best can get caught in one of those days.. my boat would then be very unseaworthy..especially if sharp splinters of either wood or broken ali went through the tubes.

For me.. my life is worth the cost of buying the proper replacement part.
However if your use is only calm waters and not far from the shore..its a different kettle of fish. However if you do get caught out.. and a bit further from safety that you hoped..remember ... those who recommend making stringers..will be safe on land
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Old 03 August 2016, 12:39   #9
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Look up alibaba.com extruded aliminium showcase if you contacted them they will possibly have your profile and maybe end caps to suit.
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Old 03 August 2016, 17:28   #10
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Quote:
Originally Posted by The Gurnard View Post
My thoughts are slightly different from some of the other guys..so take them with a pinch of salt if you wish.



I use my wooden floored 4.3m Sib in any weather..therefore I know how much a pounding the floor gets in a good chop. There is no way I would trust home made repairs to my stringers. If they break at sea in a bad weather day..and even the best can get caught in one of those days.. my boat would then be very unseaworthy..especially if sharp splinters of either wood or broken ali went through the tubes.



For me.. my life is worth the cost of buying the proper replacement part.

However if your use is only calm waters and not far from the shore..its a different kettle of fish. However if you do get caught out.. and a bit further from safety that you hoped..remember ... those who recommend making stringers..will be safe on land

Should have explained my wooden floor was made of fiber glassed layered 1in marine ply.
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