Compression Post Problem

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Harry Asbury

How do you tell when your compression post is getting shorter? My 83 H27 startboard bulkhead is showing a widening gap along the side of the coach roof and the plywood vernier at the top has started to buckle. Yet the teak trim on the compression post looks fine. I mounted a dial indicator to read the movement between the bulkhead and coach roof and over several weeks it has moved five thousandths of an inch. the port side bulkhead looks fine. So is this an indication of compressing compression post or something else?
 
Dec 2, 1999
15,184
Hunter Vision-36 Rio Vista, CA.
Only the shadow knows!

Harry: I think that these older boats have problems with the foot of the post in the bilge. The generation after yours has a problem from the top down. If you check the archives I think you will see some references to this.
 
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Gary

Check the bottom, not the top

Look under the compression post, not on top of it. I know of a used boat many thought had shrouds too long. We considered cutting the shrouds and re-swedging new eyes on them before we looked in the bilge and found that the base the mast stood (in this case full mast, no compression post) had broken and was settling. We made a steel plate that bridged over the area where the wood set in fiberglass was failing and all is well now.
 
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David

Checking Compression Post

Harry, I replaced the wooden compression post on my '88 H33.5 last year. Unfortunately, the only thorough method to check the integrity of the post is to remove the teak panels covering the post and inspect the entire thing visually. My post had rotted completely. Fortunately I noted and replaced the post before more serious structural damage occurred.
 
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David Krozier

Compression post failure on H27

Harry: Sound very familiar. I noticed the same thing on my H27 this past summer when I finally decided to find out why the door to the head wasn't closing well. I have the same space between bulkhead and deck on the starboard side only . There is also about a 3/8 inch dip topside around the mast step. It appears that the compression post has crushed the plywood on the cabin sole that it appears to sit on. Although thats not the only reason for the bulkhead moving. Running my hand under the cabin sole in the area of the compression post doesn't reveal any gross defects. Anyway, its way too cold up here now to do anything about it. I expect that repairs are going to be rather involved. I also know that water has gotten into the balsa core under the mast step from all the holes drilled there by previous owners. I epoxied them over but I think the damage was already done. So, I have had to make the unfortunate decision to give up a summer sailing. I plan to have my mast unstepped in the spring and then remove the trim pieces and compression post, check the support structure under the cabin sole and repair as necessary. About the time everyone else is getting launched I will probably be removing and replacing the deck core around the mast step, and reassembling everything. I had been thinking about rewiring my mast (the slapping cables inside the mast drives me crazy at night) and replacing all the 20 year old electrical fixtures that always go dark at the worst time. Since my H27 is a 1979 I also think its time to take a real close look at all the standing rigging and replace at least a good portion of it. I suspect we have the same problem and so If you get anywhere with this before I do I would sure like to get an idea of what to expect. David dkrozier@ti.com
 
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