Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 15-07-2012, 16:56   #1
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,152
Who was it that said ships can't turn quickly?



__________________

__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 15-07-2012, 16:58   #2
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
Re: Who was it that said ships can't turn quickly?

Wow!
How many Gs is that?
__________________

__________________
Who knows what is next.
Therapy is offline   Reply With Quote
Old 15-07-2012, 17:20   #3
Senior Cruiser
 
IslandHopper's Avatar

Cruisers Forum Supporter

Join Date: Dec 2009
Location: Bundaberg Queensland/Lake Bolac Victoria, Australia
Boat: 45ft Ketch
Posts: 1,202
Re: Who was it that said ships can't turn quickly?

I like this one aswell......

__________________
IslandHopper is offline   Reply With Quote
Old 15-07-2012, 22:50   #4
Registered User
 
avb3's Avatar

Cruisers Forum Supporter

Join Date: Jul 2010
Location: Florida/Alberta
Boat: Lippincott 30
Posts: 9,913
Images: 1
Re: Who was it that said ships can't turn quickly?

Can you imagine the size of the bow/aft thrusters on that? Or I wonder if they now run of azimuth pods?
__________________
If your attitude resembles the south end of a bull heading north, it's time to turn around.
avb3 is offline   Reply With Quote
Old 15-07-2012, 23:17   #5
Registered User

Join Date: Jul 2012
Posts: 42
Quote:
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.
__________________
MasterMariner is offline   Reply With Quote
Old 15-07-2012, 23:20   #6
Senior Cruiser
 
roverhi's Avatar

Cruisers Forum Supporter

Join Date: Aug 2005
Location: Kona, Hawaii, Carlsbad, CA
Boat: 1969 Pearson 35 #108 & 1976 Sabre 28
Posts: 6,006
Send a message via Yahoo to roverhi
Re: Who was it that said ships can't turn quickly?

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.
__________________
Peter O.
'Ae'a Pearson 35
roverhi is offline   Reply With Quote
Old 15-07-2012, 23:44   #7
Registered User

Join Date: Nov 2011
Location: Fethiye Turkey
Boat: Lagoon 440
Posts: 3,164
Re: Who was it that said ships can't turn quickly?

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?
__________________
"Political correctness is a creeping sickness that knows no boundaries"
Lagoon4us is offline   Reply With Quote
Old 16-07-2012, 00:02   #8
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Quote:
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.
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 16-07-2012, 00:46   #9
Senior Cruiser
 
IslandHopper's Avatar

Cruisers Forum Supporter

Join Date: Dec 2009
Location: Bundaberg Queensland/Lake Bolac Victoria, Australia
Boat: 45ft Ketch
Posts: 1,202
Re: Who was it that said ships can't turn quickly?

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....



__________________
IslandHopper is offline   Reply With Quote
Old 16-07-2012, 04:54   #10
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: Who was it that said ships can't turn quickly?

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
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 16-07-2012, 05:12   #11
Senior Cruiser
 
IslandHopper's Avatar

Cruisers Forum Supporter

Join Date: Dec 2009
Location: Bundaberg Queensland/Lake Bolac Victoria, Australia
Boat: 45ft Ketch
Posts: 1,202
Re: Who was it that said ships can't turn quickly?

Quote:
Originally Posted by jeremiason View Post
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).....
__________________
IslandHopper is offline   Reply With Quote
Old 16-07-2012, 06:24   #12
Registered User
 
jr_spyder's Avatar

Join Date: Aug 2011
Location: Boston area
Boat: Little Harbor 46 (1988)
Posts: 222
Re: Who was it that said ships can't turn quickly?

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
__________________
jr_spyder is offline   Reply With Quote
Old 16-07-2012, 07:36   #13
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,117
Re: Who was it that said ships can't turn quickly?

Thats a "big stick"

Walk softly, and carry a big stick -Teddy Roosevelt.
__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 16-07-2012, 09:43   #14
֍֎֍֎֍֎֍֎֍֎

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,056
Re: Who was it that said ships can't turn quickly?

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.
__________________
hellosailor is offline   Reply With Quote
Old 16-07-2012, 09:56   #15
Registered User
 
jr_spyder's Avatar

Join Date: Aug 2011
Location: Boston area
Boat: Little Harbor 46 (1988)
Posts: 222
Re: Who was it that said ships can't turn quickly?

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
__________________

__________________
jr_spyder is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:51.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.