Who was it that said ships can't turn quickly?

[David M]

[Therapy]

Wow!
How many Gs is that?

[IslandHopper]

I like this one aswell......

[avb3]

Can you imagine the size of the bow/aft thrusters on that? Or I wonder if they now run of azimuth pods?

[MasterMariner]

Originally Posted by avb3

Can you imagine the size of the bow/aft thrusters on that? Or I wonder if they now run of azimuth pods?

4 open wheel propellers. Nuclear power so they won't tell you the top speed I have heard its in the 40-50kt range. If they have thrusters they are def. not using them in the picture shown as they are useless above 4kts.

[roverhi]

AFAIK there are no thrusters on these little boats. They are all about speed, something over 30k to launch planes and get to any hotspots in a hurry. Notice there are no planes on the deck. This is probably a trial requirement on a workup for a deployment. They don't want to take a chance of a multi million dollar plane popping it's tie down chains and going overboard. I was on one that made a moderately sharp turn and it pinned me up against the bulkhead.

[Lagoon4us]

You guys would know way more than i, i believe the Missouri burns a gallon for every inch travelled, I think it was gen-sets mains the lot......is that correct?

[Snowpetrel]

Originally Posted by Lagoon4us

You guys would know way more than i, i believe the Missouri burns a gallon for every inch travelled, I think it was gen-sets mains the lot......is that correct?

Cant be bothered with the math, but we used to burn about 150 tonnes of heavy fuel oil per day at 19-20 knots on a 2000 teu container ship. Apparently it was more like 400 tonnes per day for 28-30 knots when the early 2nd generation box boats were steam turbine. Gas turbines would use much more.

Did a turn like that once at 20 knots on a container ship. The silly cadet on the helm got confused and started chasing the compass. By the time I noticed it was too late. 35 degrees of rudder... Opps! I was appologising to the engineers for days, set off every engine alarm, and all the bilge level alarms. Good job we were in open water.

[IslandHopper]

At a guess i would say the vessels in question are going through there Vessel Manoeuvrability Trials and this is the Turning Circle test. Most ships do this and they end up with a card on the bridge similar to the ones below, giving information such as advance and rate of turn at a particular speed....

[jeremiason]

That is the USS Harry Truman "Super Carrier". The ship is over 1096 feet long and nuclear powered....

It was commission in 1996 and finished seatrails in 1998... My guess is this is photos from here seatrails.

Here is a link to the ship's specs:
USS Harry S. Truman (CVN-75) - Wikipedia, the free encyclopedia

[IslandHopper]

Originally Posted by jeremiason

That is the USS Harry Truman "Super Carrier". The ship is over 1096 feet long and nuclear powered....

It was commission in 1996 and finished seatrails in 1998... My guess is this is photos from here seatrails.

Here is a link to the ship's specs:
USS Harry S. Truman (CVN-75) - Wikipedia, the free encyclopedia

Yep, although the one i posted is the USS Nimitz (CVN-68).....

[jr_spyder]

I was stationed aboard the USS Eisenhower (CVN-69) for 3 years. This is definitely a sea trail test probably done after a yard refit period. No planes on board is a giveaway, plus the fact a helo was up taking pictures. I had a standard office rolling chair at my desk and played pinball around my office during these kinds of maneuvers. Always amusing, but many in the crew would worry the boat would just continue to roll over...

Speed trial tests were also crazy. Imagine 100,000 tons vibrating so hard you'd think the all the rivets were about to pop. Then throw it in reverse.

The ship and crew would be at general quarters for these extreme tests.

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. A loaded plane couldn't take off if there wasn't a significant wind speed over the deck for starters. Made it really hard to walk across the slippery pitching deck. That's why you often see pictures of guys holding onto padeyes on the flight deck.

Go Navy!

JR

[Blue Stocking]

Thats a "big stick"

Walk softly, and carry a big stick -Teddy Roosevelt.

[hellosailor]

With a thousand feet of ship drawing less than 40' of draft and the power of four reactors, it damned well ought to be able to skid sideways. 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.

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. Diesels and nuclear (steam turbines) don't care if they're wet or dry.

[jr_spyder]

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.

JR