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Old 23 July 2015, 22:38   #1
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What is the Correct Air Pressure for a Hypalon Rib

Was not told the pressure when I bought my rib so I have no idea, I guess around 3.5 to 4 psi ?

Its a 2007 Novurania 335
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Old 24 July 2015, 04:59   #2
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Was not told the pressure when I bought my rib so I have no idea, I guess around 3.5 to 4 psi ?
Good lord, no! Beginning at 1.5psi - maybe 2 if you're feeling lucky! Mind the sun too....
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Old 24 July 2015, 06:03   #3
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Good lord, no! Beginning at 1.5psi - maybe 2 if you're feeling lucky! Mind the sun too....

Hi

I would put .25 bar in them as most tubes inflate to this.Have you tried to Google for the spec sheet..
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Old 24 July 2015, 06:13   #4
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As willk said. You might be getting muddled up with SIB pressures which are much higher (typically 3.4psi max). On a SIB the tube is a structural element, on a RIB the hull is the structure and lower tube pressures allow the tubes to conform more easily to the sea for improved cushioning/ride/handling.
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Old 24 July 2015, 06:23   #5
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Hi

I would put .25 bar in them as most tubes inflate to this.Have you tried to Google for the spec sheet..
3.6psi? Generally those pressures are used in SIBs. Most RIBs run around 1.3 - 1.7psi. 2 psi is rock hard.

As the OP doesn't require structural support from his RIB tubes, I'd suggest exercising caution and inflating to well under 2psi first. The other end of the spectrum is running tubes too soft - anything that can be pushed in with a finger is IMO, a tad too soft. The problems occur when soft tubes are in contact with fast moving water - the ripple effect on the tubes can be quite violent and cause rubber trim and seam damage.
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Old 24 July 2015, 06:23   #6
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Originally Posted by Max... View Post
As willk said. You might be getting muddled up with SIB pressures which are much higher (typically 3.4psi max). On a SIB the tube is a structural element, on a RIB the hull is the structure and lower tube pressures allow the tubes to conform more easily to the sea for improved cushioning/ride/handling.

Hi

My apoligies , if you do a search on Google stuff does come up about this boat needs a bit more digging.I would of pasted a link but don't know how to from my phone.
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Old 24 July 2015, 06:28   #7
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Ribcraft specify 2.5psi max for their tubes


.....sh1t happens.......
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Old 24 July 2015, 08:29   #8
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Running a RIB underinflated at high speeds will cause the stern transverse seam to blow out...

I generally treat 3.5 psi / 240mb as my rule of thumb.
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Old 24 July 2015, 11:24   #9
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novurania tube pressure

Below is straight from the Novurania owner's manual:


RECOMMENDED PRESSURE 3 PSI
Inflate all tube compartments to maximum pressure of 3 PSI. If a pressure gauge is not
available, check by depressing the tube with your finger. When the tube cannot be
depressed by finger pressure, the approximate working pressure has been reacted.
CAUTION
The foot pump provided with your Novurania will not allow over-inflation of the tubes.
NEVER use dive tanks, air compressor etc., to inflate tubes; over inflation can occur
causing damage to the tubes and seams. Under-Inflation can cause excessive stress on
the tubes and hull, always maintain proper inflation pressure while operating your boat.
IMPORTANT
If the boat will be exposed to direct sunlight for a long period of time, slightly deflate the
tubes to compensate for expansion due to heat.
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Old 24 July 2015, 20:24   #10
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Thanks cgoing, I guess I was not to far off on my estimate, I do have a Sib and it said around 4 psi but did not know the Rib pressure, 2 psi as mention above seems to soft.
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