The willard owner's web site has been having a discussion of roll chocks: their design dimensions and effectiveness re. rolling. Do any list members have direct experience of installing roll chocks and comparing before and after performance? Richard

Richard, here on the east coast we call them bilge keels. Google boat roll chocks, or bilge keels and several forums will come up. Maybe you'll get some data from them. *Rudy & Jill Sechez * *BRINEY BUG-a 34' Sail-Assisted Trawler * *Anchoring Consultants-trawlertrainingabc.com* *850-832-7748 * *Beaufort SC northbound- Chesapeake* > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

Our DeFever 44 had bridge keels when we bought her about 12 years ago. They were installed by the previous owner. He wad sent a sketch of his bilge keel design to Arthur DeFever (obviously before he passed away). Arthur "approved" the design. When we bought her, she had the bilge keels and a Naiad stabilizer system installed. My conclusion at the time was the performance of the bilge keels were unsatisfactory, so he installed the Naiads. I can't come up with the name (CRS) but there is a production trawler with bilge keels. They brag that you can beach the boat at high tide and the keels will support her when the tide goes out. Makes for easy bottom inspection or cleaning. I think it may be a Reuben Trane design. Having stayed at a Holiday Inn recently, I suggest that a heavy boat like a Willard would need large (at least 18") on each side and running much of the length of the boat. This would be an expensive undertaking requiring an experienced naval architect. This is an interesting discussion topic but nothing I would consider for a boat I owned, Expensive and no guarantee of success. If however you have lots of money (much more than the promised stimulus) maybe you can get Willard to do some wave tank tests for you! Ted G DeFever 44, Amici Stuck in Jacksonville, FL On Fri, Apr 10, 2020 at 5:45 PM Richard P via Trawlers-and-Trawlering < trawlers@lists.trawlering.com> wrote: > The willard owner's web site has been having a discussion of roll chocks: > their design dimensions and effectiveness re. rolling. Do any list members > have direct experience of installing roll chocks and comparing before and > after performance? > > Richard > _______________________________________________ > http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com > > To unsubscribe or modify your subscription options (get password, change > email address, etc) go to: > http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com > Trawlers & Trawlering and T&T are trademarks of Water World > Productions. Unauthorized use is prohibited. > -- www.gravefamily.org

We have a friend with a 40' trawler with bilge keels. Last haulout the bilge keels were deformed by the sling/weight combination at one location and required some work to put everything right again. Frankly, I wouldn't put them on a trawler as I think the effect is minimal and there is a price to pay in fuel consumption. There were a number of boats built in England that are designed and built with twin keels (not bilge keels) so they can rest on the bottom during low tide. My guess is that those keels help reduce roll, also, and are structurally sound. <><><><><><><><><><><><>Mozilla Thunderbird<><><><><><><><><><> Bob McLeran and Judy Young Manatee Cove Marina MV Sanderling Patrick Air Force Base DeFever 41 Trawler for sale Melbourne, Florida Blog: http://mvsanderling.net/Blog Web: http://cruising.mvsanderling.net/