Re: [Cal_Boats] Cal 39 Displacement

Charlie, the only CAL 39 model that was offered with a wing-keel was the C.R. Hunt Associates-Designed CAL 39, built in the late 1980's. Perhaps one or two owners of earlier CAL 39s swapped their fin-keels for wings......? Rod Johnson, "SUNBIRD" 1979 O'DAY DS II former co-owner of "NODROG" 1970 CAL 21 On Fri, 28 Aug 2009 08:20:06 -0400 "Husar, Charlie [USA]" <hu… [at] bah.com> writes: Hi, Paul. I know a number of models had more and more cruising amenities leading to displacement creep. The big items I would figure into weight would be bigger engines or maybe a change in ballast to correct tenderness? I've seen some reference to winged keel 39s as well. Cheers Charlie From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of pw… [at] aol.com Sent: Friday, August 28, 2009 4:16 AM To: Ca… [at] yahoogroups.com Subject: [Cal_Boats] Cal 39 Displacement Here is one source for the 19K displacement. http://pages.sssnet.com/go2erie/cal39.htm I guess no one knows why there is a wide range of displacements for the Lapworth design? Paul West Adventure Kwest '80 Cal 39 Best Weight Loss Program - Click Here! http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTFoYb73mHsa3IDCMd0V4i81sEyA8J9FecioM8UFAROTwnAR7v0Ibm/

Wayne, basically the designer does add up all the weight of the boat and then there is a formula that is used to set the waterline...... basically though, that formula is used to verify the designer's "gut feeling" of where the waterline will be. These formulas allow a designer to determine how much deeper the boat will float for every added pound of ballast or gear. Rod Johnson, "SUNBIRD" 1979 O'DAY DS II former co-owner of "NODROG" 1970 CAL 21 On Fri, 28 Aug 2009 06:37:46 -0700 (PDT) Wayne Gillikin <wa… [at] yahoo.com> writes: OK - So I'm confused again. How do they come up with the displacement? I would have thought it was by determining, by measurement, the size of the hole the boat makes in the water. To do that I would think the designer would have to decide on where to put the waterline. Waterline placement, I again assume, would have to do with the actual weight of the boat. When they are designing the boat do they add up all the estimated weights of all the materials and equipment? This could account for differences in displacement from model to model. Obviously, I am no engineer. The data on http://www.baconsai ls.com/database/ boatspec. php lists the variations in models and years but the info at http://pages.sssnet.com/go2erie/cal39.htm lumps all Lapworth 39s together and, as far as I am concerened, is inaccurate and unreliable. Even though there is a web based source, unless it is the manufacturer's site, IMHO all data is suspect. I have to believe that the commercially available databases used by sail makers et al must be based on the designer's original specifications. Yes/No? Regards, Wayne From: "Husar, Charlie [USA]" <hu… [at] bah.com> To: "Ca… [at] yahoogroups.com" <Ca… [at] yahoogroups.com> Sent: Friday, August 28, 2009 8:20:06 AM Subject: RE: [Cal_Boats] Cal 39 Displacement Hi, Paul. I know a number of models had more and more cruising amenities leading to displacement creep. The big items I would figure into weight would be bigger engines or maybe a change in ballast to correct tenderness? I've seen some reference to winged keel 39s as well. Cheers Charlie From: Cal_Boats@yahoogrou ps.com [mailto:Cal_ Boats@yahoogroup s.com] On Behalf Of pwestla@aol. com Sent: Friday, August 28, 2009 4:16 AM To: Cal_Boats@yahoogrou ps.com Subject: [Cal_Boats] Cal 39 Displacement Here is one source for the 19K displacement. http://pages. sssnet.com/ go2erie/cal39. htm I guess no one knows why there is a wide range of displacements for the Lapworth design? Paul West Adventure Kwest '80 Cal 39 Get 3 Roof Quotes Quick Request 3 quotes from up to 3 local pre-screened roof contractors. http://thirdpartyoffers.juno.com/TGL2141/c?cp=RCJtgiTxjMh_lNI5W-ORYgAAJ1CIixW8vmHn6WPZlsvVErEuAAQAAAAFAAAAAM3MDD4AAAAAAAAAAAAAAAAAB3iGAAAAAA==

Wayne - I was told that displacement was the weight of the water displaced by the boat if you were to put it in a container full to the rim with water. Dunno if that is accurate or not however. My old CS 30 was supposed to be 8,000 lbs but on member on the CS list said that lift at their yacht club had a scale (no way of knowing how accurate it was) and that of the 5 CS 30's in the club, none was under 10,000 lbs. But then you are comparing actual weight to displacement which is not apples to apples. On another web list, when I was looking at the C&C 99's, there was a lot of "stuff" going around that C&C was "manipulating" their numbers by just providing the weight of the hull w/o mast, rigging or fittings etc. Bottom line is that all the numbers appear to be "best guesses" or designers goals but I was just wondering if there were any concrete info on why there are 3 different numbers published for the Cal 39's. Paul West Adventure Kwest CS 30 **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100126575x1222846709x1201493018/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072&hmpgID=115&bcd =JulystepsfooterNO115)

Weight and displacement are the same. A boat will displace its weigh. Allen On Fri, Aug 28, 2009 at 8:19 AM, <pw… [at] aol.com> wrote: > > > Wayne - > > I was told that displacement was the weight of the water displaced by the > boat if you were to put it in a container full to the rim with water. Dunno > if that is accurate or not however. > > My old CS 30 was supposed to be 8,000 lbs but on member on the CS list said > that lift at their yacht club had a scale (no way of knowing how accurate it > was) and that of the 5 CS 30's in the club, none was under 10,000 lbs. But > then you are comparing actual weight to displacement which is not apples to > apples. > > On another web list, when I was looking at the C&C 99's, there was a lot > of "stuff" going around that C&C was "manipulating" their numbers by just > providing the weight of the hull w/o mast, rigging or fittings etc. > > Bottom line is that all the numbers appear to be "best guesses" or > designers goals but I was just wondering if there were any concrete info on > why there are 3 different numbers published for the Cal 39's. > > Paul West > Adventure Kwest > CS 30 > > ------------------------------ > > >

Paul, easy answer...... There are 3 different numbers because there were 3 different (actually 4 or more) CAL 39 models. (I believe there were a few changes to each versio over their production runs) 1) 1971 design-Bill Lapworth 2) 1977 design-Bill Lapworth (deep and shoal models?) 3) 1987 design-C.R. Hunt associates Rod Johnson former co-owner of "NODROG" 1970 CAL 21 Bottom line is that all the numbers appear to be "best guesses" or designers goals but I was just wondering if there were any concrete info on why there are 3 different numbers published for the Cal 39's. Paul West Adventure Kwest CS 30 On Fri, 28 Aug 2009 11:19:49 EDT pw… [at] aol.com writes: Messages in this topic (6) Reply (via web post) | Start a new topic Messages | Files | Photos | Links | Database | Polls | Members | Calendar MARKETPLACE Mom Power: Discover the community of moms doing more for their families, for the world and for each other Change settings via the Web (Yahoo! ID required) Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe All is not lost! Click now for professional data recovery. http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTLygLLjd9f7IwdFyZfmgwsUsB4pBOWdtgC3QEuNQPWX83EggEFBUM/