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On the other hand, contrary to my own views, Don Dodds' book "Modern Seamanship, a Comprehensive, Ready Reference Guide" makes a good argument, starting at page 171, for using mostly nylon rode, with only half the boat's length or so of chain. Dodd argues that the elasticity of nylon is more important than the abrasion resistance of chain, using only enough chain to deal with coral, rocks and to give some weight around the anchor.
He argues, correctly, that in enough wind or big enough waves the chain may lose its catenary and get straightened out. Since it has no give, tremendous momentary and damaging shock loads may result.
He deals with nylon abrasion at the bow by suggesting putting plastic hose around the line where it goes through chocks or at cleats, and, though he doesn't say so, going back up to the bow several or more times a day and night to replace the chafing gear. Hopefully, without hurting yourself.
Maybe there isn't a best answer, maybe it is a personal choice about which advantages and drawbacks each person choses.
Can somebody comment on whether, as your boat length and weight increases, the weight of the chain you are carrying becomes less important? My guess is that 300 feet of chain in a 30 boat is more of a problem than the same amount in a 45 boat, even with thicker chain for the bigger boat.
As an aside, I found the Dodds book online at Google books and read his section on anchoring there. Very cool.