I suspect that the rope SHOULD have easily gone through the deck hawse if it had been properly spliced to the chain--or the rope was unnecessarily heavy or of the wrong type.
I had 20mm nylon spliced to the end of my 12mm short linked chain and it went through the deck hawse without problems.
Alternately, since this is important, if the nylon rode
is properly spliced to the chain using a modified back splice with the ends whipped and staggered, the whole covered in heat shrink cross-linked polythene sleeve (which must be slid on to the rode
prior to splicing) and shrunk down using a hot air blower rather than a flame, if this combination will not pass then you need to have a larger hawse fitted.
The last thing one needs is having had an anchor drag in storm circumstances. Adequate anchor tackle is one of the essentials along with a sound hull
and reliable and adequate emergency bilge
The only other extraneous comment I will make is to have one of those wrap-over heavy plastic shrouds to encase the nylon as it passes over the bow roller or through fair leads. Nylon is elastic--and this stretching as the vessel seat back on her anchor can cause chafe unless the rope is protected by a sacrificial shroud
. I make my own from very thick walled heavy duty non-toxic PVC clear tube..Other types of tubing might also be suitable.