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Well, ASW is a bit more complex than that. A sub can actually be navigating under a ASW ship and still be undetected because sonar waves usually only reach specific layers of the water and if the sub is navigating in a layer that the sonar can't reach (which is what subs usually try to do), then it wont be detected. That's why we've seen subs surfacing undetected right next to carrier battle groups.

SUBS ARE VERY DIFFICULT TO DETECT.
yeah you got me. I was not aware of the fact. can you explain a bit more?
 
Technically speaking , depend on what types of sonar (passive or active) , there is a practice called "thermal layers hiding" . Since active sonar usually also reveal your own position , only surface ships (noisy) commonly use it assuming that enemy threats already track you through sateline data or very fast planes , and in some case a disposable sonobuoys , in the other hand submarines mostly use passive sonar (they can still use active sonar should the need to locate enemy is higher than concealing themselve ) to ensure both steath (passive sonar doesnt require a sound transmitter ) and range , and of course passive sonar require extensive maintance and much more expensive than active sonar , so only high-level ships and submarines use it , some ASW class ships use it as well , In the ASW case passive radar allown you to see through the water in a wide angle but the ship own noise interference , moving stream in the ocean and even fish can be quite an obstacle , and submarines can use "thermal layers hiding" (means hiding between sonar signals from either the surrounding or detection angle )
 
yeah you got me. I was not aware of the fact. can you explain a bit more?

The way a sonar wave propagates through the depth of the water is not uniform. Water temperature and salinity levels creates different conditions for sound propagation and as a results the water depth gets divided into layers. Depending of the circumstances of all those conditions, a sonar usually reaches 1 particular layer of the water. If the sub navigates on another layer, as they usually do, then, you can't detect the submarine. This all applies mostly to active sonars.

Passive sonars don't emite a signal, they just listen for water noise, but again, if the noise of the sub is trapped in a layer, then the sonar can't detect it and anyway, the surface ship is usually noisier than the sub so the ship's noise also helps to cover up the sub's noise.

End of the story: Neither active or passive sonars are very good to detect a good sub. They can only detect it if all the right conditions are just right for that or if the sub is noisy (as most chinese subs are).

Again: Subs are very difficult to detect, that's why I always say that VN needs more subs.

lol really ? since when your Chinese slaughter Japanese in real life ? google (oh wait , can you guys use it ? :v ) Battle of Shanghai or Second Sino-Japanese war , your Chinese got pratically wiped out , before the massive aids from Soviet and US , for every Japanese your Chinese killed there will be 30 dead Chinese , wake up from your wet dream , you cant kill Japanese planes and tanks with arrows or whatever crappy weapons you see on your damn fiction movies . Without help from other countries (mainly the Pacific front ) There will be 1000 Nanking across China and surely you guys cant do crap about it , we all have access to many sources of infomation so stop thinking that with blocked internet of your , you are the better among us , back in 1940s we were fighting French , shall we failed ( because we were "uncivilized and live on the jungle trees" then you think that France wouldnt use left over japan runway to bomb the crap outta you ? :)

I'm in china right now, you can always find movies on television showing the chinese beating up on the Japanese in the war, its just part of the propaganda and brainwashing.
 
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a brief summary of viet-russo relationship. one thing I notice in the article: the Gepard fleet is set to increase to six by 2017. from the economics front, a free-trade agreement (FTA) between the Eurasian Economic Union and Vietnam was signed in May. Vietnam investments in Russia are expected to reach $4b this year end.

cheer!


Return of the Russians: Why the bear is back in Vietnam

June 9, 2015 Rakesh Krishnan Simha, special to RBTH

Vietnam’s growing strategic relationship with Russia is closely connected to its oil-fuelled bonanza in a highly contested area. At the same time, it brings Russia a myriad of benefits in the world’s most economically vibrant region.

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Russia-Vietnam ties that seemed to be cooling after the end of the Cold War are warming up all over again. More than 20 years after Moscow abandoned its largest foreign base, Russian military aircraft are once again welcome visitors at Cam Ranh Bay.

The renewed Russian presence in Vietnam has predictably set the alarm bells are ringing in the Pentagon, with the Commander of the U.S. Army in the Pacific confirming that Russian strategic bombers circling the massive American military base in Guam are being refueled at Cam Ranh Bay. On March 11 Washington wrote to Hanoi requesting that the Vietnamese authorities not assist Russian bomber flights in the Asia-Pacific.

The Vietnamese reaction was to remain publicly silent. According to Phuong Nguyen of the Washington-based Center for Strategic & International Studies, “From the perspective of many Vietnamese officials who fought against the United States during the war, Moscow helped train generations of Vietnamese leaders and supported Hanoi during its decades of international isolation.”

Nguyen adds: “Few things are more vital to Vietnam than an independent foreign policy. Given Vietnam’s complex history, its leaders do not want their country to be caught between major powers again. Anything that resembles U.S. interference in Vietnam’s dealings with Russia could unnecessarily aggravate this fear.”

Although the Vietnamese consider the U.S. an increasingly important partner in Southeast Asia, it’s Russia that tops the pecking order. A per an agreement inked in November 2014, Russian warships visiting the deep water port of Cam Ranh only have to give prior notice to the Vietnamese authorities before steaming in whereas all other foreign navies are limited to just one annual ship visit to Vietnamese ports.

Vietnam: Why it matters


Located at the gateway to the Indian and Pacific Oceans, Vietnam is of critical importance to Russia. Permanent basing of air and naval assets in Vietnam helps the Russian Pacific Fleet solve its problem of having to pass through the narrow straits of the Sea of Japan to gain access to the Pacific.

To be sure, the current Russian presence is minimal compared with the firepower of the 1980s, when Moscow’s Pacific fleet consisted of an incredible 826 ships, including 133 submarines, 190 naval bomber jets and 150 anti-submarine aircraft. In fact, back then Alvin H. Bernstein of the U.S. Naval War College had written the Russian buildup is “unlikely to have a specific, aggressive, regional intent since that would be quite out of character for a power” that has revealed itself as “cautious and non-confrontational”.

Three decades on, Moscow under President Vladimir Putin is once again seeking to enhance its role as both an Asian and global power, and as Bernstein noted, the country wants to be “prepared for all contingencies and opportunities”.

It’s also part of Vietnam’s Look East policy. In fact, much before U.S. President Barack Obama announced its pivot to Asia, Russia was already pivoting East, making inroads into once pro-American countries such as Indonesia and Malaysia.

However, it is in Vietnam where Russian diplomacy is in overdrive. But first a quick flashback.

Vietnam is a small country with a military that punches way above its weight. For those with short memories, the Southeast Asia country handed out resounding defeats to France and the U.S. in back to back wars. Stupendous bravery, clever battle tactics and a never-say-die spirit were decisive in winning those wars, but a key factor was that the Vietnamese had powerful friends.

During the Vietnam War, Russia played a critical role in Vietnam’s defence, supplying a massive quantity of weapons. Over the course of the 21-year war Russian assistance was worth $2 million a day. In return, Vietnam offered Russia free use of the Cam Ranh Bay base. As part of this agreement, the Russians stationed MiG-23 fighters, Tu-16 tankers, Tu-95 long range bombers and Tu-142 maritime reconnaissance aircraft at the base.

Cam Ranh became Moscow’s largest naval base for forward deployment outside Europe. Some 20 ships were berthed daily at the base, along with six nuclear attack submarines. The base played a pivotal role in helping Russia in its Cold War faceoff against American-led forces in Asia and the Pacific. For instance, when the U.S. Seventh Fleet sailed up the Bay of Bengal to put pressure on India during the 1971 India Pakistan War, the Russian Pacific Fleet was quickly able to dispatch nuclear-armed submarines and warships to defend India.

Despite Cam Ranh Bay’s importance to Moscow geopolitically and its value as an intelligence gathering post, the Russian presence practically evaporated after the disintegration of the Soviet Union. Military bases of the scale of Cam Ranh Bay cost an insane amount of money to operate and Russia no longer had cash to burn. In 2001, even the listening station was abandoned.

Splurging on Russian weapons


Although the Russian military presence declined, strong ties continued to bind Russia and Vietnam. In the backdrop of Vietnam’s high-decibel spat with China for control of the oil-rich Spratly Islands, Hanoi went on a high-octane hardware hunt. Vietnam’s legendary air force acquired 24 Su-30 combat jets from Russia, and by the end of 2015, it will operate 36 Sukhois, becoming the third largest operator of this advanced super-maneuverable aircraft.

However, it is the Vietnam People’s Army Navy (VPAN) that is really beefing up. In 2009, Vietnam signed a $3.2 billion deal with Russia that includes six Kilo class submarines and construction of a submarine facility at Cam Ranh Bay.

Another big-ticket acquisition is that of 50 Klub supersonic cruise missiles for its fleet of Kilo class submarines, making Vietnam the first Southeast Asian nation to arm its submarine fleet with a land attack missile.

Russian built submarines armed with the potent Klubs are expected to play a critical role in any conflict in the South China Sea. According to one analyst, the land-attack cruise missiles mark a “massive shift” advancing Vietnam’s naval capabilities. “They’ve given themselves a much more powerful deterrent that complicates China’s strategic calculations.”

While the subs are being built, Russia and India are currently in charge of training Vietnamese officers who will work in the submarines.

Plus in 2011 the VPAN acquired two Gepard-class guided missile stealth frigates from Russia at a cost of $300 million, with the Gepard fleet set to increase to six by 2017. These versatile ships are equipped for surface attacks, anti-submarine warfare and air defense.

The VPAN’s other acquisitions include four Svetlyak-class fast patrol boats with anti-ship missiles; 12 frigates and corvettes of Russian origin; and two Molniya-class missile fast attack ships built with Russian assistance, with four more expected by 2016.

Vietnam has also acquired advanced radars; 40 Yakhont and 400 Kh-35 Uran anti-ship missiles; Kh-59MK anti-ship cruise missiles; R-73 (AA-11 Archer) short-range air-to-air missiles; 200 SA-19 Grison surface-to-air missiles; two batteries of the legendary S-300 surface-to-air systems; VERA passive radio locators; and two batteries of the K-300P Bastion coastal defense missiles.

Economic angle


According to a research paper by Portugal-based academics Phuc Thi Tran, Alena Vysotskaya G. Vieira and Laura C. Ferreira-Pereira, “The acquisition of military capabilities is critical, not only purely for the sake of defense and strategic calculations, but also for the important function it plays in the safeguarding of both economic interests and the security of oil field explorations in the South China Sea. This latter aspect is particularly critical given the role that Russia has been playing herein. Indeed, the lion’s share of these exploitation projects has being undertaken by Vietnam jointly with Russia.”

While defense gets more traction in the media, it is energy that’s the single biggest area of cooperation between Moscow and Hanoi. The Russia-Vietnam joint venture Vietsovpetro has generated big dividends for both countries. The company has produced more than 185 million tons of crude oil and more than 21 billion cubic meters of gas from oilfields in the South China Sea. Nearly 80 per cent of Vietnamese oil and gas comes from Vietsovpetro, and the income corresponds to around 25 per cent of GDP.

Russia has also made considerable investments in Vietnam’s heavy and light industries, transportation, post, aquatic culture and fishing. These projects have led to other spinoffs – impressed by the profits generated by Russian corporations, a slew of other companies such as Mobil, BP and TOTAL have ramped up investments in Vietnam.

Vietnam’s strategic hedging towards Russia is closely connected to its economic cooperation in oil exploration, which brings significant economic benefits to both sides. Strong defense ties between the two countries has enabled Vietnam to acquire modern military equipment, providing the country with the ability to advance joint explorations of oil and gas despite growing Chinese opposition towards these projects.

At the same time, Russia is returning to reclaim its great power legacy. It offers Moscow a myriad of opportunities to secure political and economic influence with the various emerging powers in the heart of the most dynamic region on the planet.

http://asia.rbth.com/blogs/2015/06/09/return_of_the_russians_why_the_bear_is_back_in_vietnam_46727.html)
 
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source: comcom

a 105mm artillery
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a machine gun postition
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march!
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On a maneuver
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the Coast Guard
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US defence Secretary Ashton Carter visiting the VCG at his recent visit to Vietnam.
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General Vinh in a interview with a foreign media (Singapore)
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2 Vietnamese Su-30 bombers at low-altitude flight over the island Truong Sa in the SC Sea.
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the Coast Guard
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Coming soon: thank to the US, at least a dozen of military-grade Metal Shark 75 Defiant class. one interesting thing is, Greg Lambrecht, the Vice President of his company reveals Metal Shark Aluminium Boats has been working with the Vietnamese Coast Guard though the U.S. State Department and U.S. Coast Guard for more than two years on the project. so under the surface there is a secret cooperation between VN and US running since years.
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Metal Shark gets orders - The Daily Iberian: News

Specs:
Length, 75’ / 22.86 m
Beam: 21’ / 6.4 m
Operational Draft, Outboards: 39” / .99 m
Fuel Capacity (Std): 3,000 gallons / 11,356 L

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not a problem. the Metal Shark high-speed boat is military grade, widely used by the US Navy and Coast Guard. do you like this gun? say Yes, and you get forward and aft machine gun mounted.
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Land-based Balistic Missile

This news may bore other members from countries, that possess advanced balistic missiles. If so, they may skip this.

in a report of Ministry of Defence, Vietnam´s Military Institute of Science and Technology has mastered this baby: Scud-B short range balistic missile. it is an old tech, but one has to start somewhere.

Scud-B, mounted on a wheeled military vehicle 9P117 Uragan, MAZ-543 truck, 11.25 m long, 0.88 m in diameter, launch weight of 5,900 kg, 985kg conventional high-explosive warhead, range of 300 km with accuracy of 450 m CEP. approximately one hour to finish a single launch sequence. It uses an inertial guidance system and a single-stage liquid propellant engine. Vietnam has undisclosed number of missiles and launchers, reportely received 12 launchers from the Soviet Union in 1979.

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...and some may be aware that North Korea balistic missile program bases upon Scud technology. it is just a short leg to go from B to C variant.

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carlosa, I hope you come back soon from the ban.
aqsuperman, it will nice if you continue posting in this thread. dito to other viet members.

I have little interest to be the lonely contributor. thinking to stop here. Otherwise.
 
Vietnamese Type 63 on the move , old China war-supplied since 70s , recently updated with a new ventilation system and increasing engine power , interestingly in 1979 war , China commited many armored , infantry and arty units with the same equipments as some of our , so both side of the war firing Type 56 AK , attacking emplacement with Type 59 and Type 63 , bombard each other with Type 59-1...............talking about hard to differ friend from foe when everyone shooting the same things :)

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My God, old Scud missile , but still work well, US Patriot cant intercept . VN also possess thousand scud missile.

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The Saudi Air Force Commander Lt. Gen. Muhammad bin Ahmed Al-Shaalan was killed in a Scud missile cross-border attack by Yemeni Houthi rebels on the big King Khalid Air Base at Khamis Mushayt in the southwestern Asir region of Saudi Arabia,DEBKAfile reports. The attack took place on June 6, but his death was concealed under a blanket of secrecy until Wednesday, June 10.

The largest Saudi air base, it is from there that the kingdom has for last two and a half months waged its air campaign to end the Yemeni insurgency. Saudi and coalition air strikes, directed against the Iranian-backed Houthi rebels, their allies from the Yemeni army and from local tribes, have killed an estimated 2,000 people, some of them civilians, including women and children.
DEBKAfile’s military sources in the Gulf remarked that even the tardy official disclosure of Gen. Al-Shaalan’s death Wednesday left more questions than answers. The terse three-line announcement said: “The Commander of Saudi Royal Air Forces Lieutenant General Mohammed bin Ahmed Al-Shaalan died Wednesday during a working trip outside the kingdom from a heart attack.”
No information was provided about the nature of his putative “working trip,” its destination and purpose - or even the date of his funeral.
Our military sources report that the Houthis’ Scud attack caught the Saudis unawares. The only reaction from the air base came from the American teams operating Patriot counter-missile batteries. They tried to shoot down the incoming missiles and managed to intercept only two or three out of a barrage of 15.
The US has deployed Patriots at Khamis Mushayt to shield the special operations units and drones fighting Al Qaeda in Arabia (AQIP
). But since the start of the Yemen civil war, American drones have been feeding the Saudi Air Force with intelligence about Houthi targets and movements.
Saudi air chief killed in Yemeni rebel Scud attack on Khamis Mushayt air base
 
UH-1 is one of few weapons still in active despite their root since ARVN time (the others are M113 APC , M101 howitzer and so on) , meaning parts and ammunitions are very very hard to come by after being expended in 1979 war in both front and more than 10 years of small scale skirmish , still recently , the fleet is coming back to regular servive with overhaul from Australia and parts from many third party dealer (US at this time wont sell VN any of these things) .Some picture of them .
Unarmed and armed
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UH-1 is one of few weapons still in active despite their root since ARVN time (the others are M113 APC , M101 howitzer and so on) , meaning parts and ammunitions are very very hard to come by after being expended in 1979 war in both front and more than 10 years of small scale skirmish , still recently , the fleet is coming back to regular servive with overhaul from Australia and parts from many third party dealer (US at this time wont sell VN any of these things) .Some picture of them .
Unarmed and armed
View attachment 229710 View attachment 229711

Vietnam going to buy western fighters (EF2000, Jas-39, F-16) like western media say or no?
 
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