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Old 09 April 2013, 07:10   #11
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Have just cut off my PVC tubes ready to receive new Hypalon tubes. It was interesting to view the baffles when tubes dissected. Difficult to describe without pictures, but all five baffles had gone, perhaps uneven pressures when inflating, but more I think - over heating in the sun. Also kids using the tubes as a trampoline for diving wouldn't have helped.

The construction of the baffles were not as I was expecting. I thought they would be PVC circles stuck to the tubes at the circumference. They weren't, more like a wind sock. Windsocks for Airports/Airfields/Heliports : McWilliam WindSocks They lie along the tube, obviously stuck at the larger circumference end to the tube and the narrowing end, just closed together and stuck.

So when inflating tubes, too much air one side of chamber would in effect turn the wind sock inside out and force it back on itself - so it would lie in the opposite direction in the tube. No problem with that I guess, as when you inflate the other adjoining chamber, it will try and do the same in reverse!

God this is getting difficult to describe in words It would have been uneconomical to have repaired all baffles and would have ended up with five patches. Tubes were nearing the end of life so forced into new.

I guess the important bit for me now is that the new tubes have A6 over pressure valves. Avoiding any build up in pressure which destroys the baffles.

However tubes must have been like that for 3 years and I never had any problems or even noticed for that matter. Only became an issued once the tubes sprung a leak from seam at tube cone, deflated tubes coming back from I of W, completely flat and looked like a scuttle fish. I was nearly tempted to leave off the tubes altogether looks more like a surf board
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Old 09 April 2013, 09:51   #12
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Repairing Baffles.

I might get shot down for this, but I don't think I'd worry too much.
If the tubes are otherwise sound, the chances of getting a catastrophic rip in normal usage are pretty minute. A puncture of a "normal" size wouldn't be too threatening as Sibs are low pressure beasties and and associated leak would be easily kept up with by pumping every now and then. Use it and enjoy it I reckon.
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Old 09 April 2013, 16:10   #13
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Thanks Chaps, interesting description of the baffle construction, not at all what I expected either!

Was slightly alarmed at how quickly the whole thing deflated itself when the valve was take out, did think of stuffing a big ball under the bow dodger. Will try to get a look at it again on Saturday and will report back.
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Old 09 April 2013, 19:13   #14
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Thanks Chaps, interesting description of the baffle construction, not at all what I expected either!

Was slightly alarmed at how quickly the whole thing deflated itself when the valve was take out, did think of stuffing a big ball under the bow dodger. Will try to get a look at it again on Saturday and will report back.
Warning I have been drinking and this might be crazy!

Could you get a couple of beach balls. Deflate them and get them through the valves (assuming removable cores), move to the end and inflate the balls - obviously needs some thinking about how! Then reassemble and inflate the tubes? Not going to be as air tight as a baffle but would help keep shape and reduce leak if punctured?
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Old 09 April 2013, 19:45   #15
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Is it absinthe tonight ?

Actually, it doesn't sound like a bad idea til you think about the practicalities of it.
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Old 10 April 2013, 04:16   #16
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Warning I have been drinking and this might be crazy!

Could you get a couple of beach balls. Deflate them and get them through the valves (assuming removable cores), move to the end and inflate the balls - obviously needs some thinking about how! Then reassemble and inflate the tubes? Not going to be as air tight as a baffle but would help keep shape and reduce leak if punctured?
Are you by any chance a gynaecologist??
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Old 10 April 2013, 05:20   #17
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Are you by any chance a gynaecologist??
I don't think he has any professional qualifications, but I suspect he's a keen amateur...

He may be onto a usable solution though. His beachballs have a few problems in the real world:
1. Very flimsy
2. Nearly impossible to position and inflate
3. Won't deflate and pack away

An adaptation: Buy two longish inflatable thwarts, cut your existing side valves and a section of fabric out and insert the thwarts, partially gluing them behind the new enlarged opening. These would act as buoyancy in the event of a main tube failure and could be filled first before the main tube.

Personally, I'd just dump the SIB, if you have a failure as you are, you'll lose the motor, maybe worse...
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Old 10 April 2013, 13:22   #18
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Go to an insulating company and fill it with expandable foam
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Old 10 April 2013, 14:21   #19
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Is it absinthe tonight ?
i don't think so... but I was in Cardiff and as last week's pictures show when you drink in Wales - ANYTHING is possible.
Quote:
Actually, it doesn't sound like a bad idea til you think about the practicalities of it.
I prefer to think of myself as a concept guy and let others work out the implementation!
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Are you by any chance a gynaecologist??
Good thinking - engaging expert help could be useful.
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I don't think he has any professional qualifications, but I suspect he's a keen amateur...

Quote:
He may be onto a usable solution though. His beachballs have a few problems in the real world:
1. Very flimsy
2. Nearly impossible to position and inflate
3. Won't deflate and pack away

An adaptation: Buy two longish inflatable thwarts, cut your existing side valves and a section of fabric out and insert the thwarts, partially gluing them behind the new enlarged opening. These would act as buoyancy in the event of a main tube failure and could be filled first before the main tube.
you see I should drink more - my best ideas (which have now stimulated your refinement) come in moments of clarity...
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Old 10 April 2013, 14:41   #20
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you wont need baffles if you use this stuff. it will make yur sib punture proof

Genuine Ultraseal GB, Ultraseal UK, puncture, punctures, prevention, tyres, tyre, motorbike, tyre sealant, Ultraseal, Ultra Seal GB, Ultraseal USA - Tyre Conditioner.
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