Tube pressure

[Jason calleja]

Hi all i have a Maxxon rib 480 the tubes are made from pvc and it is ¾ 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 don’t want to damage the tube but i was told that pressure in tubes may affect the ride. What do you think. Thanks

[bingosucks]

i think malta`s bloody lovely and when you get it set up you take me and my famiy for a spin

[Locozodiac]

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 ?

Happy Boating

[two stroke mick]

i am told by a local rib repair man that tubes are damaged by underinflation

[Locozodiac]

Originally Posted by two stroke mick

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 42ºC of exterior temperature and probably high temp waters & extreme sun.

Happy Boating

[Jason calleja]

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

[Locozodiac]

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 22ºC with water at 18ºC to have an idea. Check what's best for your location, post results and use a pressure gauge.

Happy Boating