Dehler 25 Mast Compression - SailNet Community
 
LinkBack Thread Tools
post #1 of 7 Old 09-23-2010 Thread Starter
Junior Member
 
Join Date: Sep 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Angry Dehler 25 Mast Compression

I have just discovered that my 1984 built Dehler 25 has mast compression . Symptoms being slightly loose shrouds, small crack forward of the mast tabernackle and a crack in the plastic keel casing together with a definite depresion of the tabernackle. I have no idea how the load is spread through the coachroof as there does not appear to be a support directly to the keel. This boat has a water ballast tank under the cockpit sole and forward of the forecabin bulkhead so I am sure that the load is spread over the arch of the coachroof. Has anyone any previous experience of this on this particular model of boat. I live in Spain where the vast majority of boats here belong to petrol heads and sailing is in the minority and I feel that there may be a lack of experience in the boat yards. I have emailed Dehler in Germany to see if they can assist with construction plans but not yet received a response. I have little experience in boat building but more then handy generally, not only that, a lack of cash means I have to get hands on. I am not too proud to accept any advice but do need it directly related to this boat please. Many thanks in anticipation. Ian
ianroriston is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 09-23-2010
Senior Member
 
St Anna's Avatar
 
Join Date: Mar 2003
Location: Southern QLD, Bayside
Posts: 1,428
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 13
 
Hello Ian,
Could you sent some pics of the depression and crack.

Often, what appears to be too big a job, is best attacked one step at a time. Some one here on SN will have the experience and advice to help.
regards


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
St Anna is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 09-23-2010 Thread Starter
Junior Member
 
Join Date: Sep 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Dehler 25 Mast Compression

Thanks very much for the pictures advice and I have taken some for information. They show the mast tabernackle and the gantry that leads off to either side, close ups of the tabernackle and the keel case inside the saloon. I would say that the compression is 3/4 mm maximum. Hope this helps, Ian
Attached Thumbnails
Boat Mast Compression 001.jpg   Boat Mast Compression 002.jpg   Boat Mast Compression 003.jpg   Boat Mast Compression 004.jpg   Boat Mast Compression 009.jpg  

ianroriston is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 09-23-2010
Senior Member
 
St Anna's Avatar
 
Join Date: Mar 2003
Location: Southern QLD, Bayside
Posts: 1,428
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 13
 
Dehler may be the best people to talk to as this may have happened to your model in the past.

Cause:
Has the mast moved either forwards or backwards due to overzealous tensioning of the forestay or backstay? Is there any flexing of the bulkhead or a 'creaking' noise from the bulkhead on a windward beat?

Fix:
Ok, from what I can see in the photos, you have to take the mast down, remove the tabernacle & headlining and find out what has moved. You will then need to reinforce the decking and possibly the footing or integrity of the bulkhead.

This would be done by a mixture of epoxy and something akin to a group of chainplates to the tabernacle.

I am glad you noticed this when you are tied up to a marina, not in the middle of the atlantic.

Step by step and good luck. Please post your progress (with pics)


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
St Anna is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 09-23-2010
Senior Member
 
tommays's Avatar
 
Join Date: Sep 2008
Posts: 4,296
Thanks: 1
Thanked 30 Times in 30 Posts
Rep Power: 7
 
I Would guess that what ever wood was used under the mast area in the core has gotten wet over time and turned soft

The cure will be to cut out and replace

1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
tommays is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 09-24-2010 Thread Starter
Junior Member
 
Join Date: Sep 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I'm pretty sure that as there is an absence of a mast compression post that the load is taken up by a ring beam spread through the coach roof to the hull. The bulkhead between the saloon and the V berth for'd is certainly not load bearing and a bukhead only exists on the starboard side. The portside is open access to the V berth. The keel case is simarly not load bearing. I am hoping that Dehler will respond to my email request for construction details. I can find no previously reported problems of this nature with this model. The boat is a Van de Stadt design and this guy was no mug. I am beginning to think that it is water ingress into the wood immediately below the mast via the screw holes that hold the tabernackle to the coach roof, probably marine ply but I am unsure just how intricate the replacement will be if it is a ring beam and the integrity of the structure is to be preserved. From previous research I learned that these boats were built to sail in the Baltic and considered to be sturdily and well constructed, just got unlucky I guess.
The forestay is not adjustable but the backstay is. Thanks for your suggestions so far, Ian
ianroriston is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 09-24-2010
Senior Member
 
Join Date: Apr 2003
Posts: 4,192
Thanks: 50
Thanked 38 Times in 37 Posts
Rep Power: 15
     
Quote:
Originally Posted by tommays View Post
I Would guess that what ever wood was used under the mast area in the core has gotten wet over time and turned soft

The cure will be to cut out and replace
That's exactly how it appears to me too. Seen it many times. A good fiberglass guy can fix it to where you would hardly notice.
That's not to say that the whole house hasn't sagged a little bit too. Boats are soft.
knothead is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in









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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
CAL 36 mast compression beam kapitany Cal 4 05-31-2013 02:28 PM
Getting a compression tube into mast sailboy21 Gear & Maintenance 1 08-17-2008 09:54 PM
mast compression on beneteau 381 jefflisajohnson Gear & Maintenance 11 11-25-2006 09:52 PM
mast compression 38 mk3 drillerkc74 C & C 0 09-04-2006 02:31 PM
Mast compression KenD Gear & Maintenance 3 01-27-2003 12:23 PM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

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