Originally Posted by jonp
Does anyone know if these are relief valves? (doesn't say in the book)
If the rib is up on the plane how can slightly soft tubes effect performance, surely the tubes are skimming above or only slightly touching the surface?
Sorry for my ignorance Im new to owning a rib and also living in an area they are not popular due to the harsh conditions. This site also states to search for an answer rather than starting a new thread on something already covered.
The pictured valve is the new Zodiac push-push valve that was introduced in about 2009.
It is only a toggle-able one-way valve. It does not act as a pressure relief valve.
A reduction in tube pressure can cause high frequency oscillations in the tube set which can cause premature wear on the sterns, especially the stern-most perpendicular seam before the cone.
In SIBs, low tube pressure can cause a lack of rigidity in the vessel, which can cause the bow to drag, increasing the friction to the water, and reducing performance.
RIBs aren't affected as much, but you can really trash your tubeset running it underinflated.
Bottom line, check the pressure after putting the boat in the water. It should be 3.5 psi.