View Poll Results: What is your boat's displacement?
0-10,000lbs (0-4.5 metric tons) 5 5.38%
10,000-20,000 lbs. (4.5-9 metric tons) 21 22.58%
20,000-30,000 lbs. (9-13.5 metric tons) 32 34.41%
30,000-40,000 lbs. (13.5-18 metric tons) 13 13.98%
Over 40,000 lbs. (18 metric tons) 22 23.66%
Voters: 93. You may not vote on this poll

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Old 12-10-2012, 10:19 PM   #21
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Wow, interesting poll so far.

1978 Marine Trader 36. We bought her 9 months ago, was a rag bagger before that. We like the change. Although I am 53 I am not near as old as my kids think I am.
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Old 12-10-2012, 10:28 PM   #22
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1983 Cheer Men PT 41, 28,000 lbs. Captain 1978 vintage, 10 yrs experience on pops boat. This is my first boat and just finished first season, itching fog spring!
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Old 12-10-2012, 11:13 PM   #23
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Quote:
Originally Posted by READY2GO View Post
All this talk of size lately got me to thinking maybe a poll of boat displacement might be interesting. So let's see who we are. Please enter your boat into the poll.
Displacement and weight are not the same are they? Weight is measured in the slings on a lift. Displacement is the weight of water that the vessel displaces. Is that right? Anyway we weigh about 40000 lbs. 1998 boat. 1947 skipper. Got the boat 4months after initial launch.
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Old 12-11-2012, 12:00 AM   #24
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I always thought displacement and weight were equal. I could be wrong.

2000 Mainship 390 with twin Yanmar. 26000 pounds. 55.
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Old 12-11-2012, 12:08 AM   #25
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I always thought displacement and weight were equal. I could be wrong.

2000 Mainship 390 with twin Yanmar. 26000 pounds. 55.
So did I. Our boat weighs about 30,000 pounds. So it sinks into the water until the hull displaces 30,000 pounds of water, at which point it stops sinking into the water and floats. Add weight to the boat like a person stepping aboard and it sinks deeper into the water until the amount of extra weight is displaced at which point the boat stops sinking again and floats.

That's how I've always understood it to work.
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Old 12-11-2012, 12:14 AM   #26
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"A ship's displacement or displacement tonnage is the weight of the water that a ship displaces when it is floating with its fuel tanks full and all stores aboard. The term is usually applied to naval vessels. Displacement is the actual weight of the ship, since a floating body displaces its own weight in water. Another way of thinking about displacement is the weight of the water that would spill out of a completely filled container were the ship to be placed into it." (Thank you, wikipedia.)

On the other hand, tonnage is a measure of volume for non-military craft.
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Old 12-11-2012, 12:24 AM   #27
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95 model Sea Ray, 65,000 pound displacement when loaded. Me? I'm a 1946 model and I got my first boat at age 5. You do the math to figure the years of experience.
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Old 12-11-2012, 12:27 AM   #28
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Any object floating at rest in still water will displace a volume of water which weighs exactly the same as the object.

However, "Displacement" as stated by the designer is computed from volumetric measurements at specific waterlines.

Tonnage is a measure of volume, and specifies the usable cargo volume of a vessel.
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Old 12-11-2012, 12:27 AM   #29
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Marine trader 34, '73 vintage, Captain 1942 vintage. The specs on the boat are 17,000 # but I would guess most of our MT34's are close to 20k with all the stuff that's been accumulated aboard over the years.
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Old 12-11-2012, 12:33 AM   #30
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52,000lbs, 2005 49' Defever RPH, 2yrs in May....went from 20 footer. My vintage is 1967, a Centennial year in Canada.
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Old 12-11-2012, 12:45 AM   #31
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What I am finding most surprising so far are the number of boat makes and models that are close to ours in size but are much, much lighter. For example A Ross' 34' Marine Trader is only two feet shorter than our GB36, yet it weighs about five tons less.

I have no opinion about the significance of this other than it's rather surprising. I have assumed that boats similar in style and size to ours would weigh about the same but that is clearly not the case.
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Old 12-11-2012, 12:55 AM   #32
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1977 Californian 34' Long Range Cruiser (LRC), twin Perkins 4.236 85 hp diesels, the specs say 18,000 lbs, but I bet I'm pushing close to 20,000 lbs. Never had it weighed, though. I've owned the boat for 5 1/2 years, I'm 55.
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Old 12-11-2012, 05:51 AM   #33
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Hobo's design displacement is 39,500 lbs at half load according to Krogen. Fill the water and fuel tanks, add 3,700 lbs. The last time we were on a travel lift where the operators felt the gauges were accurate, we weighed a little over 44,000 lbs (tanks not full). When the tanks are full, with tools, 2 sewing machines and all our other "stuff" we are pushing slightly over 46,000 lbs.
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Old 12-11-2012, 07:42 AM   #34
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Interesting discussion... I'll 'weigh' in here. Belle Aurore is a 1978, 53 ft. stretched Hatteras LRC. I've had her one year and she is my first 8 knot boat. Here is my quick calculation of her displacement - and sure I have forgotten some things. 55,000 lbs dry boat, 9,650 base fuel, 2,500 reserve fuel, 3,582 water, 1,668 reserve water, 500 spare parts & tools, 300 electronics & safety gear, 300 personal items, 860 dingy with motor. This gives me 74,360 Lb displacement.
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Old 12-11-2012, 08:03 AM   #35
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Bounty Offshore Pilot 257, 11,000 lb displacement fully loaded, powered by Volvo KAD44P diesel sterndrive, 5100 hours so far. Built for us in 97-98.

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Old 12-11-2012, 08:19 AM   #36
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1984 Monk 36, 24000# displacement, 3 years ownership, Old Navy Guy class of 46'
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Old 12-11-2012, 09:54 AM   #37
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Be curious to see what we do/did.

I just recently retired as an airline pilot.

It seems there are quite a few aviation people here.
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Old 12-11-2012, 09:59 AM   #38
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Not as many big (heavy) boats as was first thought. Interesting.
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Old 12-11-2012, 10:07 AM   #39
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We displace 34.4 tons... but they're shapley tons!

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Old 12-11-2012, 10:13 AM   #40
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Be curious to see what we do/did.

I just recently retired as an airline pilot.

It seems there are quite a few aviation people here.
I was born 1960 and was 'semi-retired' until age 32 (never quit a job and was never fired...just did contract work, seasonal jobs, traveled, went to Fine Arts and Photography schools, hiking, expedition sea kayaking, etc) then got a real job at Post Office. Been there almost 20 years. I'll retire the same year our daughter graduates high school in 6 years. Still a large format B&W wet darkroom photographer who makes all his chemistry from scratch.
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