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Old 01 October 2010, 17:24   #11
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Show me a set of serviceable 30 year old PU tubes then
Forget 30 years, I wish I could get any set of tubes to last 10 years....

My R.I.B.s work in pretty heinous conditions, i.e., landing against ship hulls, against rocks, landing on barnacle covered structures and god knows what else, and I can trash a set of Hypalon tubes in the span of three years. The Wing polyurethane tubes last on the order of triple what a Hypalon tube lasts...

And unlike my experiences with hypalon, I've never had a fatal blowout or huge tear in a Wing polyurethane tube. I've come home from jobs with half a hypalon tube hanging from a boat like tattered drapes...

The other HUGE plus is the strength of the attachment points; I recently had my 36' R.I.B. stuff the bow into a 6' wave and the hypalon tube separated from it's bolt rope attachment at the bow and down both sides about 8 feet. I've stuffed Wing tubes into larger seas and at greater speeds than this and never had an issue.

My primary concerns are safety and durability and having the boats make it home in one piece after a tough day, hypalon doesn't come close to a Wing tube in this regard.
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Old 01 October 2010, 17:35   #12
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, hypalon doesn't come close to a Wing tube in this regard.
PU or hypalon was the question, not tube maker
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Old 01 October 2010, 17:57   #13
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PU or hypalon was the question, not tube maker
I don't have any experience with other PU tube makers and have no idea if they are using the same 40 oz. Cooley polyurethane or maintain the same quality manufacturing practices that Wing does, so I can't speak about them...
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Old 01 October 2010, 18:01   #14
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need to be sure we compare apples with apples, or the points are mute.
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Old 01 October 2010, 18:14   #15
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need to be sure we compare apples with apples, or the points are mute.
Or moot even....
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Old 02 October 2010, 09:46   #16
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Hi Nico,

Good to have you on here. I was wondering if you make fuel bladders with a capacity the 20-25 liter ballpark. Can it be done at a reasonable cost (under $ 200 per unit?) I'm not sure if PU is suitable for this application.

Also I was looking at the info on your website about the 4.7m CRRC (P-4.7) and noted that it uses a conventional inflatable center v-keel. According to the site, the P-4.7 performs similarly to a similar sized boat with 'speed tubes'. I'm guessing that that is referring to a zodiac FC-470. Could the performance similarity be due to the fact that the P-4.7 has bare hull weight of only 180 lbs compared to 330 lbs of an FC-470, therefore allowing the weight difference compensate for a less efficient hull design? Also did you experiment with any true tunnel hull designs (rather than a futura hull) for this application?
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Old 02 October 2010, 14:13   #17
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Show me a set of serviceable 30 year old PU tubes then
Don't get me wrong, I love Hypalon... but to use one of your phrases "horses for courses"

30 years service may be a goal for us (UV stability) but commercial operators and military (auction off 10 year old ribs, of which I'm a proud owner) abrasion resistance is what they are after. It doesn't need to last 30 years because they won't have it anymore...they want it to last 7-10 grinding up against pilings and other boats. That's one place where PU is superior (and holding air).

For must of us though... Hypalon is the ideal material.
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Old 04 October 2010, 14:36   #18
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Don't get me wrong, I love Hypalon... but to use one of your phrases "horses for courses"
To continue that line of reasoning, a 30 year old PU-tubed boat would be a very early example. That would be like comparing one of Zodiac's early PVC boats after say 20 or 30 years (which probably isn't going to happen,a s most of them came apart at the seams...) I'm sure glued hypalon boats went through a few growing pains when adhesives were being tested, as well.


Technologies generally improve over time (or are superseded and disappear); I wouldn't necessarily discount a 30-year old process because there aren't any 30 year old examples around.

jky
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Old 04 October 2010, 19:37   #19
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To continue that line of reasoning, a 30 year old PU-tubed boat would be a very early example. That would be like comparing one of Zodiac's early PVC boats after say 20 or 30 years (which probably isn't going to happen,a s most of them came apart at the seams...)

jky
I've seen one particular 5 year old PU tubeset that will not see thirty years... I could barely stand the sight of it at 5.
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Old 14 October 2010, 01:36   #20
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Where did Nico go?
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