> … entire cabin top forward of the mast was actually deflecting upwards.
When evaluating the increase in cabin top loading also consider the athwart ships loads when gybing. As the mainsail loads up it is able to exert significant side loads. On Calypso, before the extent of failed balsa damage in the area was fully understood I found some unusual cracks where the aft bulkheads were attached to the coach roof. The weakened balsa/glass areas were allowing the coach roof to move slightly under high loads, especially side loads from the main sheet. The cracks showed up after being knocked down in a 48 knot gust (upwind, #3 headsail and two reefs). The combined loads of the main and headsail sheets were all concentrated in the same area of the side deck and coach roof. Back in 1999 I was working on opening up the aft area of Calypso’s cabin. The original owner wanted an enclosed area for the stbd quarter berth and the chart table. I wanted to open the area up but not reduce the strength (this area is directly under the traveller). The enclosure included a hull to coach roof post (solid teak with teak faced plywood bulkheads tied in), At a minimum I wanted to cut out large “windows” in the bulkheads and possibly cut the post down to level with the chart table. I called Rob Ball and discussed how many of the other 70’s C&C 43s were open in this area. Rob indicated it should be OK but some of the other 43 configurations (all 70’s 43s have custom interiors) included SS posts in the areas around the nav station or galley. At the same time I read the books and reports from the 1998 Sydney to Hobart race where many boats suffered structural damage to their coach roofs. After reading about how many 1998 S2H boats suffered failure of the coach roof from wind/sail forces or knockdown/wave (water) forces I decided to leave the teak post and several inches of each bulkhead (I beam concept) in place. I expect you will be able to find someone racing a 38 that has successfully moved the traveller and re-enforced the coach roof in a way that was attractive and cost effective. Martin DeYoung Calypso 1971 C&C 43 Seattle [Description: Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Petar Horvatic via CnC-List Sent: Monday, March 30, 2015 10:24 AM To: 'Edward Levert'; 'Dennis C.'; cnc-list@cnc-list.com Subject: Re: Stus-List Cabin Top traveller on 38Mk II This is so true Ed. Thanks. This is what I was fearing. You need attachment to the bulkheads/superstructure. That’s why the one year when my babystay attachment started to give way down in the head, I noticed that the entire cabin top forward of the mast was actually deflecting upwards. For where traveler needs to be, I will have to think how to achieve this. Petar Horvatic Sundowner 76 C&C 38MkII Newport, RI From: Edward Levert [mailto:weeselev...@gmail.com] Sent: Monday, March 30, 2015 11:43 AM To: Dennis C.; cnc-list@cnc-list.com Cc: Petar Horvatic Subject: Re: Stus-List Cabin Top traveller on 38Mk II My 1981 C&C 34 with cabin top traveler has stainless steel posts which apparently tie the traveler bases to the bulkheads in front of the nav station and stove. I would therefore be cautious of the loads that are generated at the cabin top without any internal strengthening. Recall that decks deflected upwards at the mast collar due to halyard tensioning on boats prior to the tie in with straps from the collar to the mast. Ed C&C 34 Briar Patch New Orleans, La. On Mon, Mar 30, 2015 at 10:23 AM, Dennis C. via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Peter, I've seen boats with the conversion. A pier neighbor years ago did it on a Cape Dory. He had Garhauer build it for him. Garhauer makes the complete traveler system or just the mounting brackets (UR-1 or UR-2) with pivoting bases to match the crown of the cabintop. More importantly, my buddy up the bayou has a 35-1 with a cabintop traveler so I know it can be done. I had to strengthen the cabintop on my 35-1 when I upgraded the halyard winches. There wasn't much beef there. The issue may be any gap between the headliner and the underside of the cabintop. You can easily put backing plates behind the brackets under the headliner but there might be a bit of "crush" around the plates. I put some aluminum backing plate under a couple of cabintop winches on a Catalina last year. They came out looking nice. If you need aluminum plate, there are a couple vendors on eBay that are reasonable and fast. Dennis C. Touche' 35-1 #83 Mandeville, LA On Mon, Mar 30, 2015 at 9:41 AM, Petar Horvatic via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Hi everyone, Has anyone (DIY) installed a second mainsheet traveler on cabin top, or moved the traveler to cabin top? I know that few listers have both cockpit and cabin top travelers, was that factory installed? For cruising and living aboard C&C 38, I find cockpit traveler to be very annoying and always in a way, however the backing is very solid. Cabin top on the other hand does not look very sturdy as a way to provide mainsheet traveler attachment. Petar Horvatic Sundowner 76 C&C 38MkII Newport, RI
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