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Old 16-07-2012, 10:04   #16
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Re: Who was it that said ships can't turn quickly?

Aircraft on deck are chained to the deck, except of course when being moved.

Aircraft carriers have steam turbines, reduction gears and four propellers. It's pretty straight forward.
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Old 16-07-2012, 10:11   #17
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Re: Who was it that said ships can't turn quickly?

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Nice boat. 720 deg. twist on the shaft? Wow...and look, it's even trying to throw up roostertails!

But, it hasn't got sails, and it isn't a stinkpotter (steampotter?.....neutronpotter?), and has more projectable power than most countries. Enjoy from a distance...
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Old 16-07-2012, 14:24   #18
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Re: Who was it that said ships can't turn quickly?

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I'd guess the limiting factors are worries about the center of gravity and capsizing the ship and that IF someone had to perform those manuevers in combat, perhaps to avoid incoming torpedos, the least of their worries would be how many aircraft slide overboard.
There isn't any risk of capsizing a ship when turning in calm water but the heel can be severe. In one turning circle trial, somebody fell and tripped the main electrical breaker...
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Cruise ships use diesel electrics and azipods, warships don't AFAIK. I'd expect electric propulsion is a big no-no for warships, where damage control and flooding in the engine room is a real concern. Electric drives and electricity, bad mix with seawater.
Many warships have diesel-electric or steam-electric or gas turbine-electric propulsion.
Diesel-electric: all non-nuclear submarines, French Mistral-class LHD...
Steam-electric: US New Mexico-, Tenessee-, Colorado-class battleships
Gas turbine-electric: UK Daring-class destroyers

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Old 16-07-2012, 14:35   #19
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Re: Who was it that said ships can't turn quickly?

How much fun would it be to have been the guy that screamed "Hard to Port" right before the turn
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Old 16-07-2012, 16:21   #20
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Re: Who was it that said ships can't turn quickly?

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How much fun would it be to have been the guy that screamed "Hard to Port" right before the turn
Not to nit-pick or start a flame war, but the correct terminology would have been, "Left full rudder."

No photographs to support this position for obvious reasons but submarines I was on normally operated at design angles (30° up and 30° down) and turns with full rudder at full speed soon after getting underway from any significant in port period to ensure that everything was stowed properly for sea. No submariner wants to have objects come loose and rattle around when performing evasive maneuvers. These "angles and dangles" along with emergency blow surfaces were always a hit with guests we had on board.
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Old 16-07-2012, 17:26   #21
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Re: Who was it that said ships can't turn quickly?

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Routinely for launching aircraft the ship would get to 30ish kts into a 20 kts headwind. Gave the planes 50+ kts of velocity before their wheels starting turning.
30 knots of wind over the deck for launch and recovery. With a 20 knot headwind, you would only need to add 10 knots of ship speed over ground.
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Old 16-07-2012, 17:45   #22
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Re: Who was it that said ships can't turn quickly?

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Thats a "big stick"

Walk softly, and carry a big stick -Teddy Roosevelt.
That would be "Speak softly and carry a big stick, you will go far", which Teddy attributed to a West African proverb.
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Old 16-07-2012, 18:47   #23
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Re: Who was it that said ships can't turn quickly?

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That would be "Speak softly and carry a big stick, you will go far", which Teddy attributed to a West African proverb.
In his 1901 Minneapolis speech, referring to Americas advancement into foreign policy, he modified it to the "walk" text.
For many , the carrier fleet has signified this dominance, FWIW.
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Old 16-07-2012, 18:53   #24
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Re: Who was it that said ships can't turn quickly?

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One of my favorite factoides we told visitors to the ship was that the prop shaft, which is about 3 feet in diameter, twists 720 degrees between engine and prop when the power is applied. That's a lot of torque. If I remember right each prop is around 34 feet in diameter and weighs many tons. All details available online if you look for them.

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Guess that means no need for shear pins, huh?
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Old 16-07-2012, 19:35   #25
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Re: Who was it that said ships can't turn quickly?

30 knots of wind over the deck for launch and recovery. With a 20 knot headwind, you would only need to add 10 knots of ship speed over ground.

Unfortunately the wind doesn't always cooperate and the ship has to make all the wind across the deck. What's more interesting for the aviators is the ship bucking into heavy seas. The round down at the back of the ship can be pitching 10' or more. I night qual'd with the deck pitching 6'. Roll out on final and the meatball that gives you glide slope was going from top to bottom of the mirror. Had to figure out what the average was and shoot for that. The carriers will launch aircraft in almost any conditions if there is a need to have Aircraft up there. Some of the old salts in the squadron had some interesting stories of bringing planes aboard in near hurricanes during the cold war.
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Old 16-07-2012, 19:38   #26
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Re: Who was it that said ships can't turn quickly?

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One of my favorite factoides we told visitors to the ship was that the prop shaft, which is about 3 feet in diameter, twists 720 degrees between engine and prop when the power is applied. That's a lot of torque. If I remember right each prop is around 34 feet in diameter and weighs many tons.
Nimitz Class carrier's prop is 22-25 feet in diameter. The prop shaft is just over two feet in diameter and doesn't twist that far going from ahead full to emergency reverse.
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Old 16-07-2012, 19:39   #27
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Re: Who was it that said ships can't turn quickly?

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30 knots of wind over the deck for launch and recovery. With a 20 knot headwind, you would only need to add 10 knots of ship speed over ground.
.
Well, as far as I'm concerned, if a ship is rounding up that bad, he ought to reef.
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Old 17-07-2012, 07:34   #28
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Mty son was a nuke engineer on the Roosevelt and I took a father and son trip up the east coast. During a high seed run, we stood on the fan tail and there was a wake as far as the eye could see.
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Old 17-07-2012, 18:42   #29
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Re: Who was it that said ships can't turn quickly?

A catamaran wouldn't tip like that and would probably go even faster.
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Old 17-07-2012, 18:56   #30
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Re: Who was it that said ships can't turn quickly?

i bet he wouldnt be able do that with containers piled 4 high and not lose one.........
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