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Friday, September 25, 2009

You Can't Always Get What You Want


A number of readers have commented on the bow pulpit posts about accommodating some of the newer anchors like the NZL made Rocna anchor. These anchors, with their "roll bar" appear to be the "superior" anchor of the day (if not most expensive, they are still under patent I presume). Problem is fitting them to a larger platform style pulpit/bowsprit like that of the Westsail 42. The "roll bar" feature of these anchors creates difficulty in that the roll bar will collide with the underside of the platform as the anchor is pulled up and stowed. At this time, the best thing we can do to handle this is designing an option to "drop" the forward roller so the anchor effectively stows underneath the platform. This has the advantage in that it will cause the anchor to be self-launching, but the shank of the anchor might have "stick out" a bit above the platform.

Another way is to do a "third" small roller way forward so that the anchor's rollbar can clear the very forward of the pulpit. I have seen this on a couple of boats down at the marina, albeit on smaller pulpits.

On another note, after looking at pulpits on other similar sized boats down at the marina, I think we will stick with 2.5" tubing for the perimeter frame of the platform. We were considering 2" as that was the largest my stainless guy could bend, but I think this would be an area we don't want to skimp on as it relates directly to strength. So I need to find someone else who can at least bend this size tubing.

4 comments:

The Incredible Hull said...

Well done RJ. I'm happy that you are busy working on my next problem as I will be fitting a bowsprit of TIH eventually. I still believe that the modern anchors are the way to go.

Whatever you decide the recovery process is critical. I have seen many anchors that jam on the recovery as the anchor shackle comes over the roller. Lots of force is then used to pivot the anchor up until the shackle clears the roller. I also do not like using any form of swivel arrangement.

Hopefully you will not be making your blog pay-per-view anytime soon.

Thanks

Gerry

Colin&Lizzy said...

You can get the diamensions of the
anchor from there site. I did and a fab shop made me a copy for 100 bucks. It works great
Colin

rj said...

Gerry,

Look for an "anchor roller design testing lab" here in a couple weeks (in the style of Practical Sailor LOL).

No charge for this drivel... er... blog. Maybe a beer next time I am in the Miami area.

-r

Jerr Dunlap said...

Very well-reasoned design and construction! I'm writing a substantial series of articles on anchors & anchoring you might like to check out on my blog, that go into some depth about anchor types and why various "features" are either sales gimmicks or actually work. Sadly, there's a lot of the former about. Deltas don't follow wind shifts well and can bend shanks in rock but are otherwise ok; Rocknas are very good but that roll bar's both unnecessary and a pain; CQR's my favorite plow-style anchor.