PLAN Type 035/039/091/092 Submarine Thread
- Thread starter crobato
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MwRYum
Major
Re: PLAN submarines Thread II
Is it just me or this one taking a strange dip angle? Not a natural afloat position ain't it?
No One Cares These Photos Anymore?
Is it just me or this one taking a strange dip angle? Not a natural afloat position ain't it?
Re: PLAN submarines Thread II
I don't get the comment about people not caring about these submarines. I was definitely glad to see them. They appear to be in the same positions as the last set of photos which were taken in October. For now, I'm calling that new Yuan submarine the 6th unit, but it could be the 5th.
I don't get the comment about people not caring about these submarines. I was definitely glad to see them. They appear to be in the same positions as the last set of photos which were taken in October. For now, I'm calling that new Yuan submarine the 6th unit, but it could be the 5th.
Re: PLAN submarines Thread II
Is the new sub (039B?) in the picture the same one as we have seen before in the older photos or is it a new one i.e. a 2nd 039B?
Similarly is the new Yuan in the picture another boat or the one associated with the 039B we have seen before - yes TP, is it the 5th or 6th boat?
There is little or no issue with the boat (the Yuan) being trimmed to be low in the bows - they usually do that when they (dockyard and maintenance people) need more access to the stern of the boat without having to dry dock her - probably to service the propellers or the tail fins - just flood the bow ballast tanks and empty the stern ones.
The figure for the Kilo of 6,800+ nautical miles must be for snorkeling under diesels and not for running on batteries that's just too far.
For comparison, a WWII German Type XX1 boat (1600 tons surfaced/1800 tons submerged) could go 250+ nautical miles at 5-6 knots on batteries (50% the vessel's empty displacement) or alternatively it could also go 110 nautical miles at 10-11 knots and finally could travel 17+ knots for about an hour.
Those figures are for a battery with a full charge.
For creeping at 5-6 knots, the Type XX1 engages a pair of auxiliary 30 hp motors which drive the shafts via a rubber belt!
Figures for the much more modern French Agosta class, and the German 205/209 series, (though both are already long obsolete) are comparable.
I would expect those range/speed figures to be (very optimistically) doubled by modern (circa 2000+) diesel/electric subs, not including modern extras like AIP.
I have actually worked in the local heavy industry (steel mill) and can say that a typical electric motor makes noise only when it is overloaded or overheating, most motors (especially the high quality, high efficiency ones) are very quiet.
Is the new sub (039B?) in the picture the same one as we have seen before in the older photos or is it a new one i.e. a 2nd 039B?
Similarly is the new Yuan in the picture another boat or the one associated with the 039B we have seen before - yes TP, is it the 5th or 6th boat?
There is little or no issue with the boat (the Yuan) being trimmed to be low in the bows - they usually do that when they (dockyard and maintenance people) need more access to the stern of the boat without having to dry dock her - probably to service the propellers or the tail fins - just flood the bow ballast tanks and empty the stern ones.
The figure for the Kilo of 6,800+ nautical miles must be for snorkeling under diesels and not for running on batteries that's just too far.
For comparison, a WWII German Type XX1 boat (1600 tons surfaced/1800 tons submerged) could go 250+ nautical miles at 5-6 knots on batteries (50% the vessel's empty displacement) or alternatively it could also go 110 nautical miles at 10-11 knots and finally could travel 17+ knots for about an hour.
Those figures are for a battery with a full charge.
For creeping at 5-6 knots, the Type XX1 engages a pair of auxiliary 30 hp motors which drive the shafts via a rubber belt!
Figures for the much more modern French Agosta class, and the German 205/209 series, (though both are already long obsolete) are comparable.
I would expect those range/speed figures to be (very optimistically) doubled by modern (circa 2000+) diesel/electric subs, not including modern extras like AIP.
I have actually worked in the local heavy industry (steel mill) and can say that a typical electric motor makes noise only when it is overloaded or overheating, most motors (especially the high quality, high efficiency ones) are very quiet.
Re: PLAN submarines Thread II
those should be the same boats that we saw in October. Wuchang doesn't move that fast in its constructions. I'm guessing the Yuan is the 6th one, but it could be the 5th one too. Not really sure.
those should be the same boats that we saw in October. Wuchang doesn't move that fast in its constructions. I'm guessing the Yuan is the 6th one, but it could be the 5th one too. Not really sure.
sealordlawrence
Junior Member
Re: PLAN submarines Thread II
A.Man,
Thanks for the pictures, I certainly care about them!
A.Man,
Thanks for the pictures, I certainly care about them!
Ambivalent
Junior Member
Re: PLAN submarines Thread II
They certainly are not at oil refineries or at petroleum pumping stations I am familiar with. Mobil Oil required us all to use hearing protection on their loading racks for this reason.
You should hear this one big electric motor at the Arco Easy Hynes facility. There is a "manifold" that distributes fuels from LA area refiners to various cities across the west via underground pipelines and pumping stations. In particular there is a pump for the Cal-Nev pipeline. This thing pumps fuels from this site in Long Beach Ca all the way to Las Vegas through an underground pipeline. It sounds like a jet fighter on take off, it's that loud. Of course we are talking about an electric motor that is about two stories tall.
They certainly are not at oil refineries or at petroleum pumping stations I am familiar with. Mobil Oil required us all to use hearing protection on their loading racks for this reason.
You should hear this one big electric motor at the Arco Easy Hynes facility. There is a "manifold" that distributes fuels from LA area refiners to various cities across the west via underground pipelines and pumping stations. In particular there is a pump for the Cal-Nev pipeline. This thing pumps fuels from this site in Long Beach Ca all the way to Las Vegas through an underground pipeline. It sounds like a jet fighter on take off, it's that loud. Of course we are talking about an electric motor that is about two stories tall.
Quickie
Colonel
Re: PLAN submarines Thread II
Imo, most of the noise comes from the pump itself and not the electric motor driving the pump. Piston-type pump normally used in swimming pools can be quite noisy. So, you can imagine the noise coming from those giant oil refinery pumps.
Imo, most of the noise comes from the pump itself and not the electric motor driving the pump. Piston-type pump normally used in swimming pools can be quite noisy. So, you can imagine the noise coming from those giant oil refinery pumps.
Spartan95
Junior Member
Re: PLAN submarines Thread II
Is there a particular reason you are equating commercial pumps and electric motors that have no requirement for acoustic management with military pumps and electric motors used in submarines that have stringent acoustic management requirements?
Is there a particular reason you are equating commercial pumps and electric motors that have no requirement for acoustic management with military pumps and electric motors used in submarines that have stringent acoustic management requirements?