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Old 04 May 2013, 09:11   #1
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Tube pressure

Hi all i have a Maxxon rib 480 the tubes are made from pvc and it is in front dark blue and rear part is white. I would like to know how much pressure would inflate it as here in summer temperature reaches 42 degrees. On the instruction it is written that working pressure 0.25bar. I dont want to damage the tube but i was told that pressure in tubes may affect the ride. What do you think. Thanks
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Old 04 May 2013, 09:24   #2
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i think malta`s bloody lovely and when you get it set up you take me and my famiy for a spin
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Old 04 May 2013, 09:47   #3
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Inflate all tubes evenly to at least 2.0 PSI at early morning, while boating, check with pressure gauge at noon or hour of day in which you have the most sun heat radiation and inflate, deflate to 3.0 PSI if needed. Keep in mind that tubes will loose some pressure at day's end.

Ribs don't need to be top air inflated to perform well as the hull is what floats rib not tubes as in sibs. Do you keep your rib moored, you take it out after using and shaded properly ?

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Old 04 May 2013, 10:21   #4
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i am told by a local rib repair man that tubes are damaged by underinflation
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Old 04 May 2013, 10:36   #5
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Quote:
Originally Posted by two stroke mick View Post
i am told by a local rib repair man that tubes are damaged by underinflation
The underinflation will be a momentary event which gives sufficient tube rigidity to feel hard at finger touch, inmediately after, sun will compensate this issue very fast...

If you inflate those tubes to 3.5 PSI at esarly morning or before rib is launched to sea, imagine the tube pressure that will be reached by noon at 42C of exterior temperature and probably high temp waters & extreme sun.

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Old 04 May 2013, 13:53   #6
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Iocozodiac I will try as you sad. Normaly I keep tubs at 1.2psi and yes I know that tempriture makes difference. I don't moore it I garage it after each use .thanks all for your reply
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Old 04 May 2013, 20:04   #7
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Jason,

You could try 2.0 PSI before launching rib to water or 2.5 PSI once resting some minutes on water for the pressure to stabilize. Check at noon what's the total pressure. If you ride sitting on tubes for many hours 2.5 PSI is a nice confy pressure at 3.0 doing same, your butt will end cursing you...

I inflate my 430 sib to 2.5 PSI once on water, with slight sun (we are no longer on summer) pressure can go up to 2.8/3.0 PSI. At days end pressure will have dropped to about 2.0 PSI. Our water conditions are ext temp 22C with water at 18C to have an idea. Check what's best for your location, post results and use a pressure gauge.

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