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Old 21-04-2013, 01:37   #1
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Aren't Steel Yachts Heavier And Need More Displacement?

hi, on my search for a good app. 40' yacht here in Australia, I just inspected a 1mm strong steel yacht, 42 feed, Adams design.
That vessel appeared to me to be quit low in hight inside and also not very wide for a 42' cruiser.
I compare it now with Catalina's 42' fibre yachts, 6' something inside and space a large L sofa.

Doesn't those steel yachts need more displacement to stay afloat than the fibre boats?
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Old 21-04-2013, 01:48   #2
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Re: arent steel yachts heavier and need more displacement?

Perhaps you are misunderstanding the actual meaning of displacement. It is basically what a yacht weighs in it's simplest explanation. A steel yacht and a fibreglass one of the same length, the steel would normally have more displacement and would therefore need more flotation to keep it afloat in the event of the unforeseen. Hope this is of some help, if not, more expert opinions will follow i am sure.

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Old 21-04-2013, 05:36   #3
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Re: arent steel yachts heavier and need more displacement?

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Originally Posted by camperfan View Post
hi, on my search for a good app. 40' yacht here in Australia, I just inspected a 1mm strong steel yacht, 42 feed, Adams design.
That vessel appeared to me to be quit low in hight inside and also not very wide for a 42' cruiser.
Yep - you've just described an Adams designed crusing yacht.
Joe Adams deliberately went for a design that was small for it's waterline length. So a 42' Adams design probably has the weight and volume of a ~38' of another design. Which means it needs a smaller rig, engine etc... But is still has the hull speed of a 42' yacht.

Personally, I like the idea...

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Old 21-04-2013, 05:44   #4
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Re: arent steel yachts heavier and need more displacement?

One disadvantage of that approach to design is that everything for boats is priced by the foot: registration, dockage, haulouts, storage fees, moorings, harbor dues, etc. It can add up over the life of the vessel.
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Old 21-04-2013, 05:46   #5
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Re: arent steel yachts heavier and need more displacement?

camperfan--there is n comarison between a steelie and a catalina. different kinds of boats for different purposes.

my friends steelie is less heavy displacement wise than my formosa. his steelie is 45 ft to my 41.
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Old 21-04-2013, 06:34   #6
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Perhaps you are misunderstanding the actual meaning of displacement. ....
Yes, OP look up the meaning of displacement. It is literally the amout of fluid an object placed in a fluid occupies or "diplaces". Understanding that should help you understand the differences.
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Old 21-04-2013, 19:36   #7
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Re: arent steel yachts heavier and need more displacement?

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One disadvantage of that approach to design is that everything for boats is priced by the foot: registration, dockage, haulouts, storage fees, moorings, harbor dues, etc. It can add up over the life of the vessel.
So can doing one knot extra everywhere you go...

(You're right of course. But we all need to make a choice, somewhere between a rowing shell and mixing bowl there is the right set of compromises in hull shape for everyone)

Mike
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Old 21-04-2013, 19:49   #8
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Re: Aren't Steel Yachts Heavier And Need More Displacement?

1mm would be like a pop can.
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Old 21-04-2013, 19:54   #9
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Re: Aren't Steel Yachts Heavier And Need More Displacement?

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1mm would be like a pop can.
Indeed. If it is 1 mm, I would stay away if it is mild steel. Hit a jellyfish and you're going to leave a dent.
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Old 21-04-2013, 20:19   #10
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Re: Aren't Steel Yachts Heavier And Need More Displacement?

Many issues in choosing build material for a given yacht
From Strength to weight factors: Specific strength - Wikipedia, the free encyclopedia
To budget, fatigue, malleability, corrosion etc..
http://www.kastenmarine.com/alumVSsteel.htm

Design displacement is just the end result from adding up all the build material, stores and equipment used.

Too light and you add ballast, to heavy and you reduce stores

My own Cor-ten hull and house allowed me to carry more inside at a reasonable build cost
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Old 02-05-2013, 01:56   #11
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People go for steel yachts for all sorts of different reasons. Because of design constraints you will not find many steel yachts under 30 feet. Over that length there are plenty of steel boats out there cruising. The percentage of steel boats you encounter is also likely to increase in the higher latitudes where hitting logs and ice is less of a worry with a steel hull. Similarly even in the tropics, the further off the beaten track you venture and the less well charted the area is, the more secure you will feel in a steel boat. Try googling the adventures of Iron Bark by Trevor Robertson. For a great affordable 35.5 steel boat visit the Voyaging Yachts website by clicking on the logo.
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Old 02-05-2013, 08:29   #12
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Re: Aren't Steel Yachts Heavier And Need More Displacement?

advantage of steelies----one is able to survive bouncing off rocks.
mating with whales usually makes disaster , but steelies can do it...
steelies come in many designs, so isnt like you have to choose only one style. as with al boats, there is goood, bad and uglier. but there are also many good styles and builds.
look long and hard at anything you like and see what you think. sail em all, also.

learn to weld.
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