C 42 Displacement

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garrywillis	C 42 Displacement		Lead	[-]
Posts: 368 02/01/06 20:21:53 Moderator	Tags : None I'm embarrassed to say, but I just hauled out for a quick bottom paint repair and I asked the Travel lift driver what 'ol Breezn weighed. I should know better but I went ahead anyway and he told me that she weighed 16 tons!!! WHAT!! Well, after recovering from my collapse, I started to remove everything off the boat at which time my wife suggested that I might need that particular tool and that bottle of wine is really fine etc, etc. So, I know the designed displacement is 20,500# and the actual factory weight is above that and then after all of your personal possessions and gear go on that # is going to go up considerably, BUT, (I'm thinking) not 11,000 pounds! Could it be real? It's just like when you get on that damn scale in the morning - sometimes you hide your eyes. Anyway, what's the consensus? Has anyone hauled out recently and asked the weight? (of the boat, that is.) I'd be interested to know what others are finding. Thanks, BTW, I only had 30 gls of fuel/water on board at the time. Garry Willis "Breezn" #502
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peter	same	#1	[url]	[-]
Posts: 313 02/02/06 06:07:37	the definitione of displacement weight vs.weight is always funny as displacement is the weight of the water displaced by the vessel not the vessels weight.
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peter	here is an answer	#2	[url]	[-]
Posts: 313 02/02/06 06:24:37	Weight-based systems Displacement Tonnage is the actual weight of the vessel and its contents. It is often used to rate naval vessels, since their weight is fairly constant and they are not subject to the kinds of port fees that are calculated on Register Tonnage. It is often expressed in long tons or in metric tons, and is calculated simply by multiplying the volume of the hull below the waterline (ie. the volume of water it is displacing) by the density of the water. (Note that the density will depend on whether the vessel is in fresh or salt water, or is in the tropics, where water is warmer and hence less dense.) For example, in sea water, multiply the volume in cubic feet by 64 (the weight of one cubic foot of seawater) to get the weight of the ship in pounds; or divide by 35 to calculate the weight in long tons. The word "displacement" arises from the basic physical law, discovered by Archimedes, that the weight of a floating object equates exactly to that of the water which would otherwise occupy the "hole in the water" displaced by the ship. Light ship tonnage measures the actual weight of the ship with no fuel, passengers, cargo, water, etc. on board. Deadweight Tonnage is the maximum weight that a ship can safely carry when fully loaded. It includes the crew, passengers, cargo, fuel, water, and stores. Like Displacement Tonnage, it is often expressed in long tons or in metric tons.[5] [edit] Origins Historically, Tonnage and Poundage was the tax on tuns (casks) of wine shipped to England, mostly from Spain and Portugal, under a subsidy granted to the English crown by Parliament starting in the 14th century.
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yorkrose	Re: C42 Displacement	#3	[url]	[-]
Posts: 357 02/02/06 07:58:50	Gary, I would be very suspicious of the measurement device on the Travel Lift. Unless it is used for some financial billing purpose, and unless it is routinely calibrated, it is likely to be far from accurate. The ones I have seen appear to be some sort of pressure gauge, but I am not sure how they are hooked up. If they simply attempt to measure the pull on the slings then the apparent weight will depend on the geometry of the loading and the height that the boat is lifted. In almost all cases the weight indicated will be too high, since any horizontal pull on the slings will also be included. Peter, I am not sure what you are trying to say. However, all figures used by Catalina are just plain weight. As Archimedes noted, it matters not whether one considers the actual weight of the floating object or the weight of the volume of water displaced. On the other hand, "tonnage" is an entirely separate item. Some tonnage is weight based and some is measurement based. The gross tonnage calculated for a C42 is 19 tons and the net tonnage is 17 tons. These are the numbers calculated by the US Coast Guard, based on official design measurements from Catalina. Regards, Gene Fuller Yorkshire Rose, C42 #870
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garrywillis	Re: C42 Displacement	#4	[url]	[-]
Posts: 368 02/02/06 08:42:53 Moderator	Gene and others, Thanks for the replies. I know that the Travel Lift is suspect but even give or take a thousand, my weight is still high. <Is there a doctor in the house?> Any other feedback on what others are weighing in at? Garry Willis "Breezn" #502
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captrick	Re: C 42 Displacement	#5	[url]	[-]
Posts: 243 02/02/06 09:06:34	Gary, I will have boat in sling to change prop in 2 weeks. What yard did you use? I can't believe the weight number and expect your water line would be above the boot stripe at that weight. Rick 704-3
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garrywillis	Re: C 42 Displacement	#6	[url]	[-]
Posts: 368 02/02/06 09:43:41 Moderator	It's actually not above the waterline and typically sits about 2" below when dry. I did use Windward so if you are using same, ask the driver what yours weighs. Garry Willis "Breezn" #502
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peter	same	#7	[url]	[-]
Posts: 313 02/02/06 12:02:35	If your boot stripe is under the waterline that is a problem. I think I misread something. I will let you now what my 42 weighs after being out of the water for two months and relaunched in mid feb. The coastguard uses net tonnage from hull design alone, nada on anything in or on the boat. Gross tonnage is with eq other than personal eq. This is my understanding and as my wife frequently tells me ,I am wrong, soooooo. lets compare weights at the end of feb. I love these posts!!!!!
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daveonwildchild	Re: same	#8	[url]	[-]
Posts: 6 02/02/06 12:23:19	Garry, When we lifted Wild Child in the fall the operator said she weighed 24,000 pounds. At the time, I thought I might have to put her on a weight reduction plan, but if your boat really weighs 16 ton, I can make a few more trips to the chandlery without worry. Everything is relative, I guess.
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tinolanza	Re: same	#9	[url]	[-]
Posts: 242 02/03/06 10:18:38	We just launched after bottom painting and repairs. Our lift operator said she weighed about 25000 lbs. In the water she sits about 3 inches from the blue stripe. Btw, I did take measurements of the fin keel depth and it sits exactly 80 inches from the waterline confirming the previous 6'8" someone reported. Tino Lanza, Dancing Dolphin (#739/3 cabin pullman, Westlake Village, CA)
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470catalina42	Displacement	#10	[url]	[-]
Posts: 59 05/15/06 14:34:31	Just had our Mark I, 3-cabin fin keel weighed for an endorsed IRC rating we need this year for racing. Empty boat (no sails, sheets, anchors, rodes, tools, utensils, clothes, or anything else loose except the cushions on the berths below). Certified scales showed 24,240 lbs. The only significant item added to the boat is the air conditioner which is 78 lbs. There was 8 gal of fuel in the tank, all other tanks were empty. I will be weighing the gear when we put it back on, but the empty boat sits at least 2 inches higher in the water than when it was loaded. I did not expect the boat to be almost 4000 lb heavier than the factory specs, and I cannot imagine where the design displacement of 18,000 lbs came from. Norman Duford Fortune Cookie
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nelsoncw	Re: Displacement	#11	[url]	[-]
Posts: 73 05/29/06 13:03:40	I had my boat weighed in March of last year at Windward in Marina Del Rey. The travel lift weighed it at 26,000 pounds. There were not any personal items on board. It had 1/2 tank of fuel/ I do not know how much water was on board. Nelson & Christine Willis "Peter Cooper" Hull #683, Three Cabin Pullman, Marina Del Rey, CA
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kenfischer	Re: Displacement	#12	[url]	[-]
Posts: 225 05/29/06 19:10:08 Moderator	In any uncalibrated hoist, our new boat, no liquids, no mast (but rigging stil onboard) was 23,000 lbs. Ken Fischer 2005 C42 #906 "Solaria", 3 Cabin Pullman, Fin Keel, Mast Furling Main, 155% Genoa
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do335	Re: Displacement	#13	[url]	[-]
Posts: 278 05/30/06 21:16:19	If the C42 really weighs this much, shouldn't we get a higher PHRF value? It would help in light air races. Steve 642-2f TESA
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melelana	Re: Displacement	#14	[url]	[-]
Posts: 391 05/31/06 04:19:22	Steve, GOod luck. "Should get" is the operative term with PHRF Chesapeake. I looked in to challenging my rating as we have a base rating of 96 in the Chesapeake for wing or fin, Mk I or Mk II. No WK credit, no reduction for a 140 vs a 155 max headsail. We do get a RF white sail credit of 6 sec/mile for a rating of 102. Did some research on ratings in other areas with predominately light air and found C-42s with ratings up to 132. Catalina 400s have a base rating of 126 with a RF credit to 132. Keep in mind the 400 has a longer waterline, deeper draft, narrower beam, lower D/L and higher SA/D. That's based on published numbers, not actuals. My PHRF Chesapeake rep insisted a rating adjustment would only be considered if I totally optimized for racing - racing bottom, string sails, strip cruising gear off - and entered enough races to "prove" a need for an adjustment. No review of the base rating would be conducted. 2 years ago, 2 C-42s (Melelana and one other) held PHRF Chesapeake valid ratings. Today there's one. I decided I wasn't going to spend $30,000+ making my cruising boat something it wasn't. I moved to a one design Beneteau 36.7 as main trimmer/tactics and let that owner buy the disposable sails, wet sanded bottom, etc. With more than 60 42's on the Chesapeake, it would be great to do some racing. But even with 41 years of racing, I can't compete in the predominately light air here at a 102 rating. I get tired of watching 3,000 lb Olsen 29s and J-29s sail past me in 4-5 knots of wind while I owe them time. Larry Melelana Catalina 42 # 175 1990 3cbn, WK Solomons, MD
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tomca	Re: Displacement	#15	[url]	[-]
Posts: 101 05/31/06 07:27:52	A rating change would be nice. Here in So Cal we have a rating of 102 and different allowances for such items as smaller headsails, 3 bladed fixed props and so on. I find that the boat sails to the 102 rating as long as there is 7kts of breeze anything under that and the boat just doesn't respond. I too hate watching J-29's and the such pass me in light air, but when the breeze picks up I love picking them off the course and still being able to make celebratory margaritas with the blender after the race. Tom Maxwell #766
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