Hey All,

I’m sure I’ve seen threads about this in the past, but could find them.

I looked at a P424 this weekend with a “filled in sump”. It appears to be concrete. I’m not sure what this might do to structural integrity (better? worse?) or how the added weight might ultimately affect the performance.

I’d love to get input from others, particularly from anyone who’s actually done this to their boat.

Please lemme know. Thanks,

Paul

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Check the bottom of this thread: https://www.pearson424.org/bb2forum/viewtopic.php?p=2005&sid=36a8daa9dc16b2ec1dcfb7f21b5c21b6

-p

<.. snip>

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Jim,
RE: The monitor installation.  I recommend putting backing plates on the mounts.  The Monitor doesn't put much stress on the transom during normal operation.  Maybe when the oar swings out to the stops there may be some pressure on the mounts, but I don't think it stresses the transom very much.  However backing plates are easy to install and give you a little more margin for error should the oar strike some hard and immovable object. 
RE: The forward bulkhead, I'll let those who have dug into this part of the boat make their recommendations.  You say the there is separation, where is the separation?

John

On Mon, Mar 30, 2009 at 3:03 PM, james bartch < ([email][/email])> wrote:

Aloha All

I wanted to follow up on tors questions regarding wind vanes. We also have a monitor and i finally got down in the transom and found that it is only backed with some large finders washers. I found that my transom was similar in making the (somewhat flimshy) pounding noise as tor is getting. The monitor has been on the vessel since 05 or 06 and appears to be lightly used. I did not see any singns of fatique from the mounting locations but was thinking it might not be a bad idea to add some backing plates at the connections to spread the load (something like 6″ round Aluminum w/5200 or so). My installion looks pretty clean and simple but as i said the wind vane blades look lightly used… do you see the need?

I also have to address the issue of the typical delamination/cracking at the forward bulkhead and it appears that the old pounding in the seaway has taken effect.

the seperation of the bulkhead appear to be minimal and is only tagged in on both sides of the port and starboard hulls and stops at the sole plate. i see that the sole plate runs under the bulkhead (past the bulkhead with the drawers) and continues to the forward bulkhead near the water tank and i have no signs of fatique at the forward bulkhead.

so… my question is, should i consider tagging in the sole plate and the bulkhead to stiffen the whole area??? The sole plate appears to be resting on a small rib for support but is not tagged in ( i can slide a putty knife between the sole and the hull (accessed from the bilge) it appear to be floating on the rib? or follow the old addage “if it anit broke, dont fix it” in this case tag it back in the same way as the the pearson guys did???

if i do as they did i only have to grind out an area about 12″ long on both sides from the sole plate up to complete the repairs. and be done with!

please reply,

i am courious what others ahve done in this area.

Jim Vessel – Island Muse

—
Regards,
John Stevenson
http://www.svsarah.com

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Jim,

I was going to build up the fiberglass inside my boat’s transom to carry the anticipated stress of the new windvane I’m mounting, but then realized that some other structures I built in there previously are already providing some structural support beyond what Pearson did originally. So for now I’ve settled for big backing plates for my windvane mounts. Unlike the Monitor, the Auto-Helm windvane I’m installing employs an independent rudder (with trimtab) bolted to the transom.

The mounting bracket for this rudder includes a pair of thru-bolted mount fittings on a horizontal plane a foot or so up from the transom’s bottom, and another pair around 18″ higher up. I made two full length backing plates, one for each of those pair of mounts, using 1/4″ aluminum plate 6″ x 27″ to spread the stress more evenly across the transom out to the areas already reinforced by the aforementioned structures. (No, I’m not an attorney, but “aforementioned” is a pretty cool word, isn’t it?) I bowed the plates with a hydraulic jack to match the transom’s camber. I figure I’ll sail with this for a while and keep an eye on it. I think it’ll be strong enough, but if there is ever a sign of stress or even notable flexing I can easily go back and lay up some roving in there to stiffen the area even more.

Regarding the forward oil-canning, I don’t quite follow your description, but here’s what I’m doing right now. I have just had 4 big, L-shaped parallelogram plates welded up to fit onto the fore and aft ends of the forepeak shelves, to be thru-bolted into the shelves and their adjacent bulkheads, making the whole a solidly connected structure. (Pearson merely screwed the shelf ends to the bulkheads with short wood screws. Oy!) These bolted plates are a stage one reinforcement up there. I recognize that at some point I’ll probably want to do the big grind and ‘glass build-up that we’ve discussed here in the past.

Tor
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Silver Heels, P-424 #17
http://www.SilverHeels.us
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Here is Bill Shaw’s recommendation on reenforcing the bow area:
http://www.pearsoncurrent.com/billshaw/mail_5_2.htm
Quent
Clairebuoyant, #132