The PLAN LCAC Type 726 Yuyi Class

Discussion in 'Navy' started by Jeff Head, Jun 13, 2011.

  1. lcloo
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    lcloo Junior Member

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    One important point many people forgot is that PLA Marine do not operate type 96 and type 99 main battle tank. Type 05 Amphibious tank is the most heaviest tank that they have, and it is faster to disembark all of them as a group to wake ashore on their own power and speed (20-25 km/hr). Also a type 05 tank can fire their gun with accuracy while in the water, enhancing fire power against shore defence. A tank in LCAC or LST cannot fire its gun.

    So far all amphibious assault exercise using LCAC only involved PLA Marines. So until we have photo of joint PLA Navy-PLA Army amphibious assault drill, we won't be seeing any PLA Army tanks on LCAC.

    Below is translation from Baidu, but note that this does Not reflect official data. I doubt any data available freely in public shows true figures, we know how China's military information is dissipated.

    Power plant
    The 726 hovercraft initially faced a technical challenge, which was the drive unit .


    The use of small gas turbines, there were no available domestic models, for this purpose specifically imported Ukraine's Dawn Machinery Complex UGT6000 gas turbine, each boat installed 2 of this type of engine. However, in the use, the UGT6000 gas turbine exposed two major shortcomings, one is the engine produced strong low-frequency vibration, and the other is high noise level, which causes bad working environment.

    According to foreign media reports, the 726 hovercraft was discontinued, the first batch of only four built. In order to solve the "heart disease" of the 726, China Aviation Industry Group developed the QC-70 small gas turbine on the basis of Taihang military turbofan engine (code: FWS-10). Compared with the Ukrainian UGT6000 gas turbine, the QC-70 is slightly lower in the maximum power parameters, but the engine weight is much lighter (reduced from 3 tons to 2.3 tons), the weight is significantly improved, while completely eliminating the two major evils of low frequency vibration and high noise, and completely rooting out the "heart disease" .

    动力装置
    726型气垫登陆艇首先面对一个技术难题,是驱动装置所采

    用的小型燃气轮机,当时没有可用的国产型号,为此专门进口了乌克兰曙光机械联合体的UGT6000燃气轮机,每艘艇安装2台该型发动机。但在使用中,UGT6000燃气轮机暴露出两大缺点,一是发动机工作时产生强烈低频振动,二是噪声水平高,这就造成其工作环境十分恶劣。据外媒报道,726型气垫登陆艇因此停产,首批仅建造四艘。
    为了解决726型艇的“心脏病”,中国航空工业集团在“太行”军用涡扇发动机(代号:FWS-10)的基础上,研发出QC-70小型燃气轮机。该机与乌克兰UGT6000燃气轮机比较,QC-70虽在最大功率参数上略低,但发动机自重轻得多(从3吨减轻为2.3吨),功重比明显进步,同时彻底根除了低频振动和高噪声两大恶疾,彻底根治了“心脏病” [6] 。


    726 hovercraft reference data:
    Occupancy 5 people
    Length 30m
    Width 16m
    Displacement 150 tons
    Range 320 km
    Maximum speed 80 knots/hour
    Weapons and equipment
    Two 14.5 mm heavy machine guns; Two 7.62 mm light machine guns


    726型气垫登陆艇参考数据:
    乘员编制 5人
    艇 长 30米
    型 宽 16米
    水上排水量 150吨
    续航距离 320千米
    最高航速 80节/小时
    武器装备
    两挺14.5 毫米口径重机枪;
    两挺7.62 毫米口径轻机枪 [1] [16] 。
     
    #721 lcloo, Aug 8, 2019
    Last edited: Aug 8, 2019
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  2. taxiya
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    taxiya Major
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  3. Tetrach
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    Tetrach Junior Member
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    Stop coming with this idea for for sake. I never said such thing. All I said is that for resolving those problems, they had to change engines. This engine is underpowered. I never made the relation between power and vibration or whatever you said.

    20190809_201337.jpg

    功率 > 7000马力
    power>7000 HP.

    As I said earlier, the designation number is representative of the power of the gas turbine. Is it hp or MW idk
     
  4. taxiya
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    taxiya Major
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    QC-70 is rated at 7.2MW, mega watts. Not 7000 horse power. P.S. China never use Non-SI unit, such as horse power.

    7.2MW is 10000HP (9655HP to be exact)
     
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  5. taxiya
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    taxiya Major
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    Don't make yourself a fool. This is the other variant of QC70, it is 7200 kW. It is a huge difference between kilo Watts and horse power. China NEVER use non SI unit such as horsepower.

    If you don't know, just don't make an assertion.
    [​IMG]

    Check your source again, where do you get it? Wiki? seriously?
     
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  6. Tetrach
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    Tetrach Junior Member
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  7. taxiya
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    Same and same. I thought you read Chinese. But you seem missed the "舰用型" in the QD70 picture. That is saying the engine has three variants, all of the same power 7200kw.
     
  8. Tetrach
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    Tetrach Junior Member
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    "It's well known that the number after QC- represents the power of the turbine. But a better question is if it's in KW or HP. Even if it was 7000MW the turbines would still be underpowered from their ukrainian counterpart by more than a thousand hp."

    that's what I said messages ago. MW or HP change nothing. still underpowered by a significant margin.
     
  9. taxiya
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    taxiya Major
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    Don't you know what is "千瓦"?
     
  10. taxiya
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    taxiya Major
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    Are you not reading your own post #726 Tetrach? Where you said 7000 KW (千瓦).

    It is not 7000kw actually, it is 7200kw. The Ukranian DM71 is 7350kw, 150kw (200hp) more, not 1000hp. If you want to go down to single digits to prove your claim. Here is my counter argument:

    70 is the class, it means plus and minus. QD is for electricity generation, which may (I say may) mean that 7200kw is the electricity rating which is 96% of the mechanical rating. It is possible that the mechanical rating is 7200kw/.96=7500kw, slightly higher than DM71's 7350kw. My assumption is based on reading other Chinese designations where the power rating is the final rating of the system.

    The conclusion is, regardless 7500kw or 7200kw, it is about the same as DM71, not underpowered.
     
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