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Friday, September 25, 2009
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.
Wednesday, September 16, 2009
Sunday, September 13, 2009
Friday, September 11, 2009
Saturday, September 05, 2009
Not sure what it is. Seems the more you stare at a CAD drawing, the more you want to change it. I wonder if design engineers have this problem.
Well, one of this fall/winter's big projects will be the bow pulpit. Factory finished Westsail 42's had two style bow pulpits. Early production boats had their pulpit hinge bolted to flat plate brackets surface mounted to the hull, just underneath the caprail. Later production boats had the mountings thru-bolted to the top of the caprail. In both cases the pulpits were fabricated from 1 inch tubing for the upper rails, 2 inch schedule 40 pipe as the perimeter structure, and 1.5 inch angle iron for cross members. All stainless steel.
Between the two original designs, I prefer the second model as it produces a platform that is more flush with the top of the caprail. The anchor chain does not have to go "up and over" the caprail. With the second design, it can go "up" to the bow roller. Therefore, my latest design iterations have started with this second model. Of course, I want to make changes, which are listed as
- integral rubstrake for the anchor chain
- place to mount chain stoppers
- any small tweak that might improve strength
- single person/wrench ability to install/remove
- four attachment points, instead of three
- forward attachment points act as rubstrakes for the anchor chain. Also can have chain stoppers mounted
- use of fiberglass grating instead of teak planking.
Finally, we have a tentative plan on how to proceed. The pulpit build will happen in three phases:
- The first phase will be fabricating just the "platform" with no "upper rails" and no mounting tabs, just the basic tubing structure. Then it will be test fitted to the bow of the boat so the size and positions of the mounting tabs can be dialed in. The fiberglass grate for the top of the platform will also be cut and test fitted to determine where the grate mounting tabs should be placed.
- The second phase will see the pulpit mounting tabs, the mounting tab backing plates, and the forestay/bobstay plate fabricated (all probably jet-cut), then welded to the platform. It will be taken back to the boat for a test fitting/mounting. Backing plates will be set and the platform will be thru-bolted.
- Finally, if everything matches and fits ok, the platform will be removed to have the upper rail tubing fabricated and welded. The pulpit should then be ready for final installation.
As for the stern pulpit, that should not nearly be as complicated.
Click here to see a more detail drawing of the bow pulpit platform.