30 feet of chain later I am like WILEY T COYOTE with just the end chain in my hand. It has parted and we lost the anchor.
The chain parted - wasn't the shackle? Was the chain mickey-mouse beforehand, i.e. rusting?
1- I have never used a swivel, but think I should this time for the wind and current shifts I anchor in. Should that be attached to the anchor or to the shackle on the anchor... and then to the chain. What kind of swivels have other used which works best.
Wind and current shifts are not usually a reason to use a swivel, unless you're doing lots of 360s (enough to kink the chain). Swivels are useful for some other limited reasons, but on a good set-up are usually not necessary. We've done 10s of thousands of miles and anchored all over the world, and never used a swivel. They can be useful to help the anchor right itself if you're not using all-chain, but a quality shackle is much better value for money and generally represents one less thing to worry about. See here:
2- I was thinking of purchasing a small float and attaching 50 or so feet of lite 3 strand line to it and then to the anchor to use as a trip system should I have trouble getting the anchor up. Playing out only the amount of line when I drop the hook that the water depth the anchor is in plus maybe 8 ft to allow for swells/ wakes. What kind of similar systems do you use.
Sure, it has a number of advantages and in your story would mean that recovering the anchor would not require snorkelling for hours.
See here: www.rocna.com/kb/Buoyed_retrieval_line
3- I am liking the 60 ft chain 250 feet line rode combo I had previously used. It given a lot to lay on the bottom, which not having all the weight of an all chain rode.
Fine, chain usage relates to the locale and has little impact on anchor performance or security. Whatever works for you.
4-snubber. What if any does everyone use when anchoring (not mooring)
(sorry for all the links but otherwise I'm just repeating myself)
I don't want this thread to turn into a discussion about anchors as I am decided on the RONCA as long as she fits into my current bow rolled/ bail configuration
C&C 35 with a Rocna 15:
I would say the 20 will fit similarly, but if you don't trust that or think the shank length might be an issue, e-mail Rocna and ask them for the full scale anchor profiles which you can use to check.