5meter Humber sib pressure

[Captain cod]

Thanks mate I think your right I'll just go with 3.5 psi all around don't think I can go wrong with that

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[Captain cod]

Just got another email from humber and this was there reply

[harrison]

Ha! Thinking your 'Man from Humber' must have a leak in his psi/bar mind. Those figures only relate to 0.14 to 0.2 bar. Would imagine most ribs have a recommended working pressure of around 0.2bar. Mine certainly has.
Any sibs I've had would perform like a wet sponge with 0.14bar in the toobs!

[Paul]

I agree, those pressures from Humber can only refer to ribs, far to low for any sib.
In the absence of a manual or any sensible advice from Humber I would inflate both tubes and keel to 0.24bar/3.5psi, which is common for quite a few makes, and see how it performs. If performance not right, some manufacturers increase keel pressure to around 0.35bar/5psi, so would treat this as an absolute max.
Good luck.

+1 with Harrison

[Andy B]

As a cautionary note.
Humber are primarily a RIB manufacture.
So chances are they use the same materials and build techniques to build their SIB tubes as they do their RIB tubes.
If you inflate the SIB past the recommended pressure you "may" be putting excessive pressure on the seams.

But of course i could be wrong???

[Captain cod]

Just to air on the side of caution next time I'll inflate them to 3psi and see how it handles. At the end of the day it is only half a psi. So can't see it making a huge difference.

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[chris moody]

Why not just pump the tubes up until they feel firm? High pressure air floors are very pressure sensitive (even slightly under inflated affects performance) but I have never found the tube pressure to be particularly critical in either ribs or sibs