Royal Australian Navy Discussions and Updates

[pussertas]

Question.

On small runabouts, there is a system on the stern which sucks water from the hull.

Is there a similar system for warships that sucks the exhaust gases from the funnel and releases them under the vessel's hull?

Such a system, properly placed, could help to remove the hull friction. I.e. the hull would ride on a series of 'bubbles'

Cheers

Pussertas

 

[Hazdog]

@pussertas
Are you referring to a design like this?

Beneteau's Airstep Hullform - Professional BoatBuilder Magazine

Bénéteau’s AirStep hullform now offered for more high-speed models

www.proboat.com

.

If so I don't believe such a system is used for the purpose you outlined, but a similar system is called 'Prairie-Masker' and is used to reduce the noise signature of warships, not to increase the vessels SOG. (a simple wiki article will give a reasonable explanation of this system Prairie-Masker - Wikipedia.)

Otherwise, I believe if any ship classes were to be fitted with a system you outlined, I would suspect the LCS classes of the USN would be likely if the system was mounted out of the way of waterjet uptakes. But I can't see that happening anytime soon with budgets being tight already.

Cheers,

H

 

[ASSAIL]

Question.

On small runabouts, there is a system on the stern which sucks water from the hull.

Is there a similar system for warships that sucks the exhaust gases from the funnel and releases them under the vessel's hull?

Such a system, properly placed, could help to remove the hull friction. I.e. the hull would ride on a series of 'bubbles'

Cheers

Pussertas

You are describing is a modified “venturi” system seen in small craft which depend on speed of water outside the hull to lower the pressure and therefor suck water out.
There are various funnel designs which also help disperse/suck gases away from the ship.
The problem with placing the exhausts underwater is that it would create back pressure in the exhaust system, not good.
As for bubbles under the hull, ice breakers use a system of compressed air to help reduce friction but I can’t see a warship using any such system as it would increase noise and reduce sonar performance.

 

[pussertas]

Thank you Assail,

Pussertas

 

[seaspear]

Doesnt the South African Valour class redirect its precooled exhaust gases to just above the exhaust line halving its infrared signature

@seaspear .... yes it does. Suggest you could add a lot to the discussion if you spent some time looking things up. Here is a basic text but there are some good graphics out there.

MEKO A Class Combat Ship Family

The MEKO A combat ships, designed by Blohm and Voss, are evolved from the MEKO family of ships. MEKO A Class Combat Ship is operational with various navies.

www.naval-technology.com

So rather than just throwIng a question out there .... please make an effort to research and carefully consider content.

Consider yourself warned on the one liner count.

alexsa

 

[aussienscale]

Reports on the news of a submarine in trouble off Sydney and heading in, fire trucks waiting with smoke coming from the sub, not sure which one, looking for some sort of reference, report was on 10 news Sydney

 

[rossfrb_1]

Channel 10 news have reported a submarine ~1km off the Sydney coast as surfaced and smoking with surface vessels approaching.
Some footage from a chopper was shown.
Hope all on board are safe.
rb

 

[alexsa]

Fire on a submarine is a truely terrifying event. Having been involved in a minor fire and seeing how bloody quickly the breathable air and visibility disappears I hope all is well.

Do you have any links ... I can find nothing

 

[t68]

Fire on a submarine is a truely terrifying event. Having been involved in a minor fire and seeing how bloody quickly the breathable air and visibility disappears I hope all is well.

Do you have any links ... I can find nothing

I found this

https://twitter.com/i/web/status/1249601462415626240

I wonder if it’s just diesel exhaust

 

[aussienscale]

I found this

https://twitter.com/i/web/status/1249601462415626240

I wonder if it’s just diesel exhaust

Yep that is the report I saw, only just saw the end as I ran into the lounge hearing the report, but also thought is just looked like the usual diesel exhaust, but did not see it properly, looking at that is looks like normal to me, no other reports anywhere on the net, wondering if they have jumped the gun ? Hope so ! would also expect more crew on the decks if there is a smoke issue inside the submarine too ?

Cheers

 

[rossfrb_1]

I found this

https://twitter.com/i/web/status/1249601462415626240

I wonder if it’s just diesel exhaust

I was wondering that myself.
Here's hoping it's all a storm in a tea cup.
Although they do refer to fire & rescue on their way to assist.....

 

[ASSAIL]

Doesnt the South African Valour class redirect its precooled exhaust gases to just above the exhaust line halving its infrared signature

@seaspear .... yes it does. Suggest you could add a lot to the discussion if you spent some time looking things up. Here is a basic text but there are some good graphics out there.

MEKO A Class Combat Ship Family

The MEKO A combat ships, designed by Blohm and Voss, are evolved from the MEKO family of ships. MEKO A Class Combat Ship is operational with various navies.

www.naval-technology.com

So rather than just throwIng a question out there .... please make an effort to research and carefully consider content.

Consider yourself warned on the one liner count.

alexsa

Just like every wet exhaust system in wide use.
Great, now I can describe the wet exhaust system in one of my ex vessels as having a “counter IR detection” function!

 

[ASSAIL]

Yep that is the report I saw, only just saw the end as I ran into the lounge hearing the report, but also thought is just looked like the usual diesel exhaust, but did not see it properly, looking at that is looks like normal to me, no other reports anywhere on the net, wondering if they have jumped the gun ? Hope so ! would also expect more crew on the decks if there is a smoke issue inside the submarine too ?

Cheers

When the Collins Class “surface snort” they produce a huge amount of steam (smoke). They actually look like there’s trouble on board.
If this is the case it won’t be the first time observers are confused and let’s hope that this is the case.

Water poured on smoking sub fears

 

[Redlands18]

When the Collins Class “surface snort” they produce a huge amount of steam (smoke). They actually look like there’s trouble on board.
If this is the case it won’t be the first time observers are confused and let’s hope that this is the case.

Water poured on smoking sub fears

Actually its the steam coming off the crew after the CO had just informed them that they wont be allowed to go out on the town due to the Coronavirus.
Poor Buggers imagine spending several weeks in a Submarine, then while visiting Sydney you are stuck on Base except for maybe a Shopping trip. No Pubs, Clubs probably not even the Base Boozer

 

[seaspear]

This is an interesting article on I.R suppression on naval ships , the company includes in its customer ships the type 26 in the R.N and the A.W.D of the R.A.N there is not any mention of the Hunter class receiving this nor can I find mention of this being deployed on the Hobarts despite what the Davis sheet states

https://www.davis-eng.com/docs/Naval%20Infrared%20Stealth%20Technology.pdf

Davis Naval Infrared Signature Solutions

https://www.defence.gov.au/casg/Multimedia/Hunter_Class_FFG_Fact_Sheet-9-9243.pdf

I add this older statement on the intent and reason for the changes of paint to the R.A.N and recall hearing of sailors finding it uncomfortable walking on deck in hot weather to almost being able to wear thongs ,I understand the R.N.Z.N will soon if not already adopt this paint AMSS26270

Australian Navy to Adapt a New Color Scheme for Surface Vessels - Defense Update:

The Chief of the Royal Australian Navy, Vice Admiral Ray Griggs, has announced that the Navy will progressively change the color of its surface fleet to meet modern war-fighting and regional environmental conditions. The new 'Haze Grey' paint scheme uses reflecting pigments reducing the ship's...

defense-update.com

 

[StingrayOZ]

In other news I see the MH-60's are getting use on the LHD's. This news even overflowed the traditional defence channels to the diplomat.

MH-60R Helicopters to Begin Flight Trials Aboard Royal Australian Navy’s Largest Warship

First-of-class flight trials for the service’s new MH-60R helicopters will begin aboard the HMAS Adelaide shortly.

thediplomat.com

It was earlier hinted in more detail what they intend to use the MH-60 on the amphibs..

Australian Navy gets more out of the Seahawk helicopter than originally planned

The Royal Australian Navy has managed to integrate the Sikorsky MH-60R Seahawk naval helicopter with a range of vessels that were not included in the original plans when Australia decided to acquire the type.

www.defensenews.com

Going forward I imagine budgets will be tight for defence, clearly the MH60 has other capabilities than ASW, and would happily operate off a LHD under any number of scenarios. I think Australia's pivot to the pacific has been reasonably successful. The recent bushfires showed it was a reciprocal arrangement in which many nations donated money, people, equipment and also highlighted how many pacific nationals are in Australia during summer.

Curious two Collins class subs operating in Sydney harbor.. They aren't seen in the harbor that often anymore. No wonder the media was confused. I wonder if they are operating with HMAS Adelaide (Coronavirus fears on board Australia's largest warship ahead of training mission) and her MH-60's practicing special integration work....

 

[alexsa]

I sometimes get despondent about the lack of information coming out of government on the current defence projections, particularly in the ship building area.

Osborne digital naval shipyard nears completion - photo essay - Australian Manufacturing Forum

The federal government’s $535 million redevelopment of the Osborne South naval shipyard on the Port River in Adelaide is nearing completion with landscaping works underway in preparation for the handover. The yard, complementing facilities where Collins Class submarines, Hobart class air warfare...

www.aumanufacturing.com.au

This is a remarkable facility with 180m long main construction shed and a start to finish production line. If kept in operation for continuous build is will be a very worthwhile investment. Good to see it close to hand over.

 

[spoz]

Looking out the window, I can assure you it is an impressive sight! While the new facilities are close to finished, there is still a bit of repurposing of the areas that have been used for DDG and OPV construction to be done.

 

[hauritz]

The sale of the last two Adelaides to Chile makes me wonder if there might not be some value in Australia fully exploiting the second-hand warship market. We could start churning out a new ship every 12 to 15 months, keep them in service for around 15 years and then onsell them to who ever wants them. There could be some strategic advantage to it as well if we could sell them in this region.

 

[Redlands18]

The sale of the last two Adelaides to Chile makes me wonder if there might not be some value in Australia fully exploiting the second-hand warship market. We could start churning out a new ship every 12 to 15 months, keep them in service for around 15 years and then onsell them to who ever wants them. There could be some strategic advantage to it as well if we could sell them in this region.

One of the strangest things i have ever seen while following the ADF is the complete and absolute utter silence that has descended from the DOD/Navy on this sale. There is nothing in any official public ADF publication at all. Nothing on the Fleet Website for the disposal of these 2 Ships, nothing on the Navy Daily site. The only information coming out, is coming from Chile. For all intensive purposes it seems as though the Ships have ceased to exist as far as the RAN is concerned, in the public eye at least.
Over 100 Chilean Navy personal have been training at FBW and yet Navy Daily totally ignores it. 2 Ships are commissioned at FBW on 15 April and yet again it’s totally ignored.
Is the RAN opposed to this sale and been overruled by the Govt?