Our club also has an Avon CCRC520, (for those that donít know this SIB has a flexible floor so it can be rolled up without taking the floor out) with a few divers onboard it would wallow all over the place
& take for ever to get anywhere. Then the subject of pressure cropped up, so I phoned Avon & asked the magic question & was told it should be run at 2.5psi. After a rummage through the back of the boat shed we found the Avon pressure gage, & next time out we pumped it up to said pressure.
Yes the boat went a lot better but it was a harder ride for the people onboard, the biggest problem was when we just touched a breakwater with the port rear tube.
There was a resounding BANG
followed by that sinking feeling,
3 out of the 5 tube chambers were completely deflated.
On close inspection after getting it out of the water showed there was a 3foot split in the back tube, & the next 2 chambers had blown the ends out of the baffles.
On having it repaired it would appear this is common when they are inflated hard (itís a bit like sticking a pin in a hard balloon as apposed to a soft one) the sudden loss of pressure in one chamber caused the baffle to go in the next one & so on.
So be aware if your rib is hard (oh err misses)
& you bump into anything be prepared for a bang rather than a hiss.