Originally posted by Sun_Coast
Is this a usual thing to happen to ribs?
Err, hope not, having a 1997 model myself!
Welcome, Sun_Coast. I'm a YBW lurker, so recognise your name from there.
My own RIB has a very substantial double-layer of hypalon under the tube attaching to the GRP hull. Some RIBs have different attachment methods, but the one you tested sounds like it had the "bodge" system. Well done for noticing it.
My own purchase was based on narrowing my choices down to builders with a great reputation (Delta, Avon, Ribcraft, Ribtec, Redbay, Scorpion, Crompton, Osprey and a few others).
That rear section is going to suffer constant battering from the sea, even when up on the plane.