SailNet Community - Reply to Topic
Thread: mast compression on beneteau 381 Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
11-25-2006 09:52 PM
yotphix I think Hello has you on the right track. For you to purchase this boat you should first determine what has compressed and why. Then you will be able to judge whether your shim is a cure or a cough medecine. It would seem to me that Beneteau, by suggesting the shim, feels that it has compressed as much as it can. Now they want you to bow the thinner, compressed section of deck upwards. Could it be that the real solution would be to rebuild that portion of deck from something less compressible? (Thus fixing any potential water intrusion simultaneously.)

Did the compression post actually "sink in" to it's step? If so then shim. If not, fix the real problem.

Oh yeah, ignore all the Beneteau haters. It's not just your boat they hate, it's most boats!
11-25-2006 09:23 PM
hellosailor "The "over-tightening rigging" sounds like a red herring " Not necessarily. I've seen the head doors jam in a number of boats because of over-enthusiastic rig tightening. Among other things.

If there's a solid filler under the mast (as there should be) and there's a compression post/beam/system under the deck (again, as there should be)...You'd have to do a real gorilla job to compress a good marine grade filler under the mast. But I think we've all met marine gorillas, I just can't remember the proper Latin name for the species.

"Yeah just stick a plate under it to regain the thickness and slack off the rigging" could actually be simply good advice, once upon a time that's how things were "made do" done. OF course, as a card-carrying cynic I'd be reluctant to do that without opening up the deck and actually SEEING what had happened inside it. Or getting something else (ultrasound?) to see inside it without peeling it open.

It sounds like this is worth a longer call to Beneteau, to ask them for more information on the larger picture.
11-25-2006 06:47 PM
Red Flag

Originally Posted by jefflisajohnson
....Beneteau has recommended placing a 3/16 ss plate between the compression post and the floor. The seller has agreed to pay for the fix. My question is will this hurt the value or seaworthiness of the boat? Any suggestions/comments greatly appreciated. jeff
I would be worried about such a new boat showing weakness under the mast step (sounds like a deck stepped mast...). The "over-tightening rigging" sounds like a red herring thrown out to direct your concern away from design/construction, the likely culprits. (In my last purchase the PO of my current boat mentioned a "recently fixed" fuel line leak to mask what should have been evidence of a pinhole in the bottom of the tank, ended up costing me $3-4,000)

That compression occurs is the problem. I don't see how putting a plate under the post necssarily fixes that - I guess it will get the deck back in line, but what does it do to prevent futher compression from occurring? Will there be three of four plates in place when you go to sell the boat...and what will Beneteau have to say then.
11-25-2006 06:14 PM
mike dryver if beneteau is telling you to put a plate between the comp post a nd floor it seems to me there is a design or cons. prob. at this point or the boat in gen. i would tell ben. to fix it so they are responsible for future prob. but you know they won't. sounds to me they know this is prob. and are giving a quick rem. i would steer away from this boat. that is your right even if you signed a purchase and sales agreement. if the floor is giving that much because of rig tension what will it do in a seaway under adverse conditions. only a quest for thought.
regards mike
11-25-2006 04:14 PM
cardiacpaul It is a big deal. SD is right the compression usually causes the leaks. I'm not stupid enough to say its a defective design, but it shouldn't be that way. period.
11-24-2006 09:38 PM
sailingdog Often the compression of the deck is what leads to the water damage—not the other way around. A properly designed boat would have a compression post or bulkhead that spread the load properly and prevented the deck from sinking down at the base of the mast.
11-24-2006 08:08 PM
hellosailor Usually that kind of compression means water damage in the deck under the mast, and that can be fixed--and routinely is.

So are you guys saying the B381 is built defectively and the deck compresses under the mast even without any water damage? Or, in either case, that there's some reason the B381 can't be repaired the way any other compressed deck would be repaired?

It sounds like this is just a question of "there's something wrong with this boat, let's figure out who's going to pay to fix it" and deal with it like any other repair. Either DIY or by a glass shop, it shouldn't be a big deal unless there's something really wrong with these boats.
11-24-2006 06:53 PM
sailingdog I'd agree with CP and say get out of the contract... The boat is only seven years old, and that's a fairly serious design flaw. Bendytoys is going to say it'll be fine with a 3/16" stainless plate, because they're interest is in getting you to buy their boat, even if it is secondhand. The plate will corrode and may cause other problems, especially if the floor isn't properly supported to handle the load it will transmit.

I've sailed on 30+ year old Cape Dorys and Albergs with deck stepped masts and many of them don't have this problem... on a properly designed boat, it just shouldn't happen.
11-24-2006 04:29 PM
Jeff, unless you're totally sold on the boat...

Cancel the contract due to the problem and find another boat.

I've seen a couple of these with the same problem, and I just shake my head at Bene's answer. "just throw a hunk o' steel underneath, it'll be fine."

While it is true you do spread the load out under the mast, there isn't a lot of support built into the deck to begin with, so all you're doing is lessening the problem. I'm not a structural engineer, but you don't stand on a liliy pad, no matter how big the pad is.

This is just my opinion, that and .50 will get you a newspaper.
11-24-2006 03:49 PM
Faster Beneteau seems to have acknowledged that this is a condition requiring repairs. The fact that such a recent boat has this problem should be a bit of a red flag.
If this is the model you have your heart set on, there must be more of them around... check them out for the same issues. Maybe look into buying one without said problem, but keep in mind that it may simply not have had that problem yet.
If the deal justifies the hassle of repairing things to start with, and - most important- the repairs are properly carried out, you could end up with a perfectly fine boat.
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

For the best viewing experience please update your browser to Google Chrome