Originally Posted by Ribochet
In my world all conventional wisdow and experience has it that chain added to the end of an anchor reduces the force on the anchor shank by decreasing the angle of pull between the rode and the sea bed thus maximizing the anchor's holding power
. It also has the added advance of reducing chafing on the sea bed.
There is therefore no reason to throw out this wisdow "just" because you are talking about a SIB.
This is the anchor/rode/storage bag that I have been using in my Hondwave 3.8 airdeck for the last 5 years with no damage
I know all the reasons behind the need for anchor chain and used to use a honda 3.8 like yours with a folding grapnel and some chain , ok on a rocky bottom , but in the sand and mud we have here it was next to useless , it would drag with even a gentle tide or wind . I Got myself a small bruce anchor on advice from the folks here and didn't even need the chain . even now with the small rib i have the same small bruce anchor and just 2.5m of chain works even in surf
Try and pull in a small bruce from the shore over sand mud or shingle which is almost always where you need moor a sib then compare it to a folding grapnel add as much chain as you can lift and it still drags .
It works well on rocky weedy bottom too
just my experience and trial and error and its not like you moor a sib overnight or for a long time.
I think you will find the small RNLI sibs use a spade type sand anchor and no chain .