Navy ship... Emergency stop

[Hot Property]

Type 42 Class Destroyers able to "crash stop" from 30Kt to standstill in 1.5 x ships length, approx 700 feet! 2 off 56.000 Hp Olympus gas turbines wound down from full chat, 2 of 5 blade CP prop from full ahead to full astern then pour in the fuel and keep clear of the wake trying to drown the Lynx helo in the hanger. Type 21 Amazon class had same machinery but weighed about 30% less than Type 42 and thus was even more impressive. For all those worried about fuel consumption, each Olympus at full power would burn just over 1 metric tonne of fuel per hour.

From memory each engine was considered to be at full power when consumption hit 125 gallons in 5 minutes ( producing approximately 25,000 shp each).

At that rate, 2 engines will consume around 3,000 gallons an hour or 13,650 litres. 11.6 tons an hour.

Superheat6k will be along in a minute to confirm I'm sure....

 

[john_morris_uk]

From memory each engine was considered to be at full power when consumption hit 125 gallons in 5 minutes ( producing approximately 25,000 shp each).

At that rate, 2 engines will consume around 3,000 gallons an hour or 13,650 litres. 11.6 tons an hour.

Superheat6k will be along in a minute to confirm I'm sure....

If you’d asked me in a pub quiz I’d have said 26,000 hp each ollie’ but who’s arguing over 1000 hp!
I do know it was very easy to exceed the max shaft torque figures and junior OOW’s used to pay the MCR in bottles of port if they got a bit eager on the levers on one ship I was on. Mind you, the MCR also used to delight in taking the engines out of bridge control if their precious gearboxes and shafts were being strained.

 

[Gibeltarik]

From memory each engine was considered to be at full power when consumption hit 125 gallons in 5 minutes ( producing approximately 25,000 shp each).

At that rate, 2 engines will consume around 3,000 gallons an hour or 13,650 litres. 11.6 tons an hour.

Superheat6k will be along in a minute to confirm I'm sure...

OTOH - cruising on one Tyne a Batch 2 could stay at sea for over 30 days without need of a FleetTrain . This enabled crossing the Atlantic, patrolling the Caribbean and just one fuel stop in Bermuda before home. Or - in Cold War terms a month beyond North Cape before coming home. They had extensive Comms and Sonar intelligence capabilties. Sadly they had no clear role after the Cold War ended - and useless in conflicts such as the Falklands.

 

[Gibeltarik]

^^ skimmer dits ?



?

Are there any others?

 

[john_morris_uk]

Are there any others?

Pull up a bollard and we’ll swing the lamp..

 

[Gibeltarik]

If you’d asked me in a pub quiz I’d have said 26,000 hp each ollie’ but who’s arguing over 1000 hp!
I do know it was very easy to exceed the max shaft torque figures and junior OOW’s used to pay the MCR in bottles of port if they got a bit eager on the levers on one ship I was on. Mind you, the MCR also used to delight in taking the engines out of bridge control if their precious gearboxes and shafts were being strained.

Dead right - giving the dabtoes bridge control was the beginning of the end! Next was dragging the MEO out of the Engine room and insisting he was on the bridge to advise ‘The Command’. What really pissed them off was the MEO spotting lights, ships and bouys before anyone else - but he is a yachty!

Union Street / Diamond Lils / The Gut / Boogie St/ Sembawang / Olangapo City - memories!!!

 

[capnsensible]

Apart from the ice one, got my ship controllers t shirt for doing this:

 

[Bandit]

If you are a boat in the way or a ship crossing incorrectly, you are in deep shitttte if it is not a waterjet or Controllable pitch prop if the deck watch actually see you. Ignoring loosing steerage and swipe etc.

 

[girlofwight]

Ive got a friend in the navy and he told me the most incredible thing he ever experienced was on a aircraft carrier that does full speed turns at 30 knots

Impressive.

40 years ago, as a teen. I was on a Red Funnel ferry with a reported MOB In Southampton Water. I kid you not Captain turned her on a six pence, must have gone to 35degree plus on the turn!

 

[Greg2]

Sadly they had no clear role after the Cold War ended - and useless in conflicts such as the Falklands.

I get the point but perhaps a tad harsh give the role that 42’s played down south. We had boats removed and BMARC 30mm & 20mm added before heading down - some might say that the requirement for such kit was blindingly obvious and I wouldn’t disagree. The subsequent addition of Phalanx was a significant development.

 

[ebbanflo]

Not sure I would count Faslane as a run ashore - went there for R&R when on a NI patrol boat and there wasn’t much to commend it - Helensburgh was particularly dismal if memory serves. Guz is a shadow of its former self - the Strip doesn’t really exist now ☹

In another life in the mid 70's I worked occasionally at Coulport and Faslane - mostly out on Gare Loch, Loch Long and Loch Goil. It always seemd to be in December. Very bleak/dreich as was Helensburgh. Visited about 15 years ago in the summer and it was very pleasant!

 

[Farmer Piles]

Not ex RN myself, but to add my four penneth.
Have any of you listened to The Reunion on Radio 4, a great show and the one relevant to this thread was the one with the guys who worked on and crewed the very first UK built nuclear subs: Dreadnought and Valiant I think. A great mixture of technical and laughter from these guys who were mainly engineers in the RN.

 

[superheat6k]

From memory each engine was considered to be at full power when consumption hit 125 gallons in 5 minutes ( producing approximately 25,000 shp each).

At that rate, 2 engines will consume around 3,000 gallons an hour or 13,650 litres. 11.6 tons an hour.

Superheat6k will be along in a minute to confirm I'm sure....

Nick - it was 1986 I left HMS Southampton, after the Armilla before the idiots wrapped it up in front of a supertanker on the next Armilla. Some of the details from my Unit Ticket have faded a bit now.

When down South in 1984 the Ollies were my part of ship when the Port caught fire. I was in the FER during the Middle at the time and saw first hand just how effective BCF gas drench was. When we repaired the failed fuel hose that squirted neat diesel all over the combustion cans we had to check for leaks at full power. I was given special permission to sit astride the thing at 90% PCL (the max peacetime throttle position), inside the module wirth my pussers right angle torch in hand. I was surpised how quiet and smooth it was. So that was two really powerful things between my legs for a while at least.

Now I know it is really sad but when I was doing my Fleetboard swatting I was convinced that the controls / engine / transmission motion from stationary at idle with the props at 0o to 90% flat out was exactly emulated by the instrumental in Ultravox 'Vienna'.

The most incredible part is that the engine itself uses about 2/3 of the power it produces to run its twin spool compressors, with another 1/4 lost through the transmission. That means 25,000 SHP is actually ~ 90 - 100,000 BHP within the engine itself.

All the gas turbines have gone now, replaced by engines that struggle to work on a rainy day in Portsmouth !

 

[wully1]

Ashamed to say that I served my time, 2 x 42s and a CVS before turning to sundodging.

For a bomber queen I did remarkably well, more runs ashore than patrols!

Sprog.... Tribal then Rothesay class before a draft to Faslane (BH&S )then RDP before the dreaded draft to Dolphin.