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Look Here
The gentle thwartship rise of a ship's deck towards the mid line is called camber. Like sheer it's very expensive to incorporate into newbuilds, so it's not seen much anymore. What a pity that is too.
[ 02-16-2007: Message edited by: Frank X. Prudent ]
Mike
Greetings Ben.
quote:Originally posted by 6263866:Ive noticed this with many older ships, from wooden sailing ships, to even ocean liners, they tend to sag in the middle, like the steel isnt strong enough to keep the whole ship level, was this because the steel wasn't strong enough?Look Here
With sheer you make the freeboard 'locally' higher at the ends of the ship - this way you can safe some material. (you can incline the ship more towards the bow or stern without flooding the decks this way - regulations play here a role too)Also, you can avoid adding bulkheads on another -higher - deck this way. (if a compartement near the bow or stern is flooded the ship is tilting towards the bow or stern - you have to make the bulkhead high enough to avoid the next compartement to be flooded - bending the decks upwards towards the ends helps a bit)
quote:Originally posted by 6263866:Why do they sag?
[ 02-15-2007: Message edited by: Cunard Fan ]
quote:Originally posted by 6263866:it must have been very expensive to perposely give a ship a sheer.
Sheer and camber along w/elegant curved sterns, sleek long forecastles have all been eliminated in passenger ship construction because of the extremely high cost-the result of course is that most cruise ships today look like boxy car carriers or container ships. Add to that the cost of building hundreds of custom made passenger cabins to line up w/the sheer and camber and you can see why those features were the 1st to go beginning in the late 1960s and early 1970s. QE2s designers designed her as a slab sided box amidships but w/elegant sheer forward and aft and QM2 has a small section of sheer decking far forward.
quote:Originally posted by 6263866:Thank you al for the info. So they did it on purpose..now thinking about it, it must have been very expensive to perposely give a ship a sheer.
The shear is one of the big problems NCL would have rebuilding the SS United States. When it was built the staterooms were constructed with what is called joiner panels. They were fit piece by piece. This gets very costly. Unlike sliding a fully fabricated stateroom module into place and connecting the electrical, and piping.
Damn, you beat me to it! The BEST answer yet!
-Russ
quote:Originally posted by VDK:While ships may have shear its not entirely incorrect that some have "sag" and "hog". Some say that QM is actually beginning to "Hog"
Correct. On some wooden hulled sloops I have crewed on we used to untension the fore and aft stays of the mast to help prevent hogging
Corse (1983), just like her sister Estérel. Not quite obvious at the first look, but when you look carefully between between the SNCM website and the SNCM logo featured on the hull, you'll see a curve on all decks.
Monte d'Oro (1991) Look at the front section portholes : closer you are from the bow higher are the portholes. Not spectacular from the outside, but quite noticeable from the inside as the corridor really "climbs" (believe me, I stayed in one of those cabins).
quote:Originally posted by viking109:Is not the sheer on the front section of QM2 merely an illusion done with the paint?
A little of both.
quote:Originally posted by Cunard Fan:Whats hog?
In refrence to your question of hogging. Hogging is when the bow and stern is bending down from the center of the vessel, this causes the center of the keel to bend upward. This can take place from improper ballasting, or fueling, Wasted steel, or coming on top of a wave in the center of vessel. And wooden vessels with rotted timbers in the hulll can cause hogging.
quote:Originally posted by lasuvidaboy:I forgot to mention that QE2 does have sheer forward and aft but all decks amidship are flat as a board. Vistafjord of 1973 was one of the last (if not the last) large cruise ships built w/a very noticible sheer.
QE2 infact has no real sheer just the look created by straight upward sloping decks from below the mast forward and the pool aft .... and of course clever paintwork.
quote:Originally posted by KenC:QE2 infact has no real sheer just the look created by straight upward sloping decks from below the mast forward and the pool aft .... and of course clever paintwork.
The HAL ships Rotterdam, Amsterdam, Volendam, Zaandam have all fake shear. The hull is painted that it looks like the have shear.
Is that not some sort of sheer? Granted her decks are not curved amidships as were most ships built before the mid 1960s but her decks are far from level once you are forward. Her mid section is built much like a newbuild-slab sided w/ level decks but her designers gave her sheer forward and aft as well as the already mentioned clever paintwork. QM2 has a small section of sheer far forward towards the bow.
quote:Originally posted by Deck 9 001:Here is another example of lovely sheer.Photo taken from inside suite at the bow looking aft.They sure don't build them like this anymore Mike
Just curious as to what ship this is. If I had to guess I would say FAIRSEA or FAIRWIND. Looks familiar.
Ernie
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