windlass upgrade on P42
WINDLASS. I have gone through the same process you are considering. In my case I bent the mainshaft on the windlass during an anchoring incident where my snublines kept breaking and I had to lay directly to the windlass for a while. Although I had it replaced (in Auckland at Maxwell's main facility), it was never the same. The circuit breaker kept popping out when I put a large load on it.
I replaced the 800 unit with a Maxwell VWC 1200, which is significantly more powerful. You don't have to alter or upgrade any of the existing wiring. I can't remember if I had to replace the circuit breaker, but if I did do so it was so simple that I cannot remember it.
The 1200 fits into the same place where the original 800 was located. However, you will need to make a minor modification if you wish to use the same bolt holes that are already there. I did not want to drill additional holes, so here is what I did.
The 1200 mainshaft is larger in diameter that the 800, so the shaft won't fit through the mainshaft hole in the plate that marries the windlass to the fiberglass on the anchor locker side of things. I solved that by having a machine shop ream that hole to the same size as the windlass mainshaft. That was all that was needed. I then used the new 1200 windlass, and the original plate that is on the anchor locker side of things. The only downside is that when I reamed out the mainshaft hole it rendered the zerk fittings unusable. I had always meant to take them off and have a shop fix that. However, it is now 15 years (and hundreds of anchorings) later, and it still works fine.
I think the 1200 is a perfect replacement for the 800, and my circuit breaker has NEVER popped out, despite my making some pretty harsh demands of it. For example, in very bad weather I sometimes have to use the windlass to help pull the boat forward to hoist anchor. I have done so, placing a huge load on it, while pulling up 3/8" chain from a depth of 50' or more. I love the thing.
CHAIN. I have never used a combination chain/rope rode, so I am incompetent to comment upon that. I have used 5/16", 3/8", 8 mm, and 10 mm chain. The 5/16" and 3/8" were hi-test. As you know, each different size requires a different chainwheel (cathead). Maxwell manufactures them for all sizes and types. The last time I bought one I seem to remember it being a bit over $100. I have several (as a result of having to match the cathead to whatever chain I am buying at the time). You won't be able to use your current (800) cathead on your new (1200) windlass since the shaft diameters are different.
I used to carry 350' of chain in the anchor locker. Anchorages run deep in certain parts of French Polynesia, so I carried that. However, now I carry only 300' of 3/8" hi test, and that has been fine. For ordinary anchoring I generally use a 3:1 or 3.5:1 scope (unless I am in shallow water) and have never dragged. For heavy weather anchoring I extend up to a 4:1 or 5:1 scope, and have never dragged. With all of that weight out there it is my feeling that the scope requirements diminish. NOTE: I am not trying to move this thread toward a discussion on anchoring technique, but I just wanted to answer your question on what combination of chain/windlass we all suggest.
I really like what I have, and can heartily recommend it. The reason I went with 3/8" high test instead of ordinary 3/8" is twofold. First, it has been my experience that the galvanizing on the high-test lasts longer before rusting. More importantly, the breaking strength of the chain takes a fear-factor out of heavy weather anchoring. We've been through a couple of incidents where the wind velocities were up over 50 knots, sometimes with attendant seas. As we all know too well, the P42 moves around a lot at anchor, and a beam wind over 50 puts A LOT of stress on the ground tackle. Without the hi-test, the safe working load of the chain becomes a consideration. Then I start to worry about having stretched links in the chain after such an incident. I also worry about diminishing the integrity of the chain after a re-galvanization. High test obviates all those concerns.
Of course you'll need to obtain an appropriately sized and tested anchor swivel as well (to match the hi-test 3/8" chain and your anchor shackles). I can't remember the brand I finally found, but it was not only acceptable in strength and manufacture, but it also fit through that channel in the bow plate. I'll be seeing my boat in a month and I can get that info for you if you'd like. I do remember that it wasn't easy to find.
Good luck with your upgrade. Cheers,
Paul