The PLAN LCAC Type 726 Yuyi Class

Thanks shen...I really like this pic of 3321!

shen said:

As posted in the Type 71 thread, Type 726 ACV appears to have puffer ports for directional control. So Type 726 appears to use both puffer ports and controllable pitch propellers for low speed directional control. The air rudders come into play at higher speed. But as with all ACVs, a lot of training and experiences are required to tame this beast.

Click to expand...

Good catch. If they are effective in directional control, then my assumption of Type 726 having a design flaw would be unfounded, which would be great!

They they are commissioning the DDG faster than the LCAC ?? Why on earth are they still sitting there

asif iqbal said:

They they are commissioning the DDG faster than the LCAC ?? Why on earth are they still sitting there

Please, Log in or Register to view URLs content!

Please, Log in or Register to view URLs content!

Click to expand...

Demand for LCACs possibly just ain't that high in the Chinese Navy relative to destroyers.

Given China's limited resources, I'm not surprised that LCACs are put on a relative backburner.

Also, they may still possibly be facing issues with LCAC technology as well... but I also think the capabilities the 721 LCAC provides may not be deemed as essential to the navy as other capabilities.

----

also, note Yuanwang 7 having been painted and launched.

I don't understand PLAN prioritys

Building 4 x LPD is a priority but equipping them is not ?

Building amphibous capability's like Zubr and Type 072 is priority but how to land forces on a beech using Type 726 is not ?

Annoys me when I see half a job done

They do have a lot of fast swimming amphibious tanks, IFV and APCs, and beach assault boats.

asif iqbal said:

I don't understand PLAN prioritys

Building 4 x LPD is a priority but equipping them is not ?

Building amphibous capability's like Zubr and Type 072 is priority but how to land forces on a beech using Type 726 is not ?

Annoys me when I see half a job done

Click to expand...

There has been issues with the turbine engine (QC-70) for Type 726. It is said the issue has been resolved now. There was a piece of news that an award has been given to a professor who had led the efforts on QC-70.

weig2000 said:

There has been issues with the turbine engine (QC-70) for Type 726. It is said the issue has been resolved now. There was a piece of news that an award has been given to a professor who had led the efforts on QC-70.

Click to expand...

This is very good news...and interesting.

Do you have some links for this...preferably with English translations?

We have wondered for a long time what the issue was...and speculated that something like this must be the issue...but to date I do not believe we had any hard evidence.

Jeff Head said:

This is very good news...and interesting.

Do you have some links for this...preferably with English translations?

We have wondered for a long time what the issue was...and speculated that something like this must be the issue...but to date I do not believe we had any hard evidence.

Click to expand...

I was quoting from my memory, so some of the details were not exactly correct.
Unfortunately, I can't find anything in English translation. The original news was from the China Aviation News website:


This is an article reporting on the various achievements of Mr. Li Xiaotang, who is the chief designers for a series of gas turbines, including QD128、QD70、QD185、R0110. Buried in all the Chinese official cliches is this paragraph:

"2004年，某小档功率船用燃气轮机立项研制，这是海军首型动力单独立项的燃气轮机，也是航空工业首次承担研制自主知识产权的舰船动力。李孝堂作为燃机型 号总设计师，面对研制时间短、任务急、技术难度大等困难，采用一系列先进技术，采用并行工程及项目管理方式，设计、生产、试车台改造及装配加工等各方面工 作安排合理，相关部门责任明确，高速运转。2006年12月，该燃气轮机在试验基地A205老试验台调试，标志着航空工业具有自主知识产权的动力产品将开 拓出又一全新的应用领域。之后，在新建试车台上仅用69天就完成了整机耐久性考核试验。2008年4月，该型燃机顺利通过技术鉴定，综合技术指标达到国际 先进水平，2015年初通过样机技术鉴定，现在用户已小批量订货并装船。"

Supposedly, this talks about QC70 (QD70), the version to power Type 726. The key milestones:
2004: program officially launched
12/2006: testing started
4/2008: successfully passed the technical specification certification
early 2015: prototype passed the technical certification, a small number have been ordered by customer and have been installed on the ships.

Note that seven years have passed between 2008 and 2015, indicating they probably had run into a lot issues.

Here is a thread on cjdby.net (a popular Chinese military website) discussing the news and its implication of QC70 and Type 726:

weig2000 said:

I was quoting from my memory, so some of the details were not exactly correct.

This is an article reporting on the various achievements of Mr. Li Xiaotang, who is the chief designers for a series of gas turbines, including QD128、QD70、QD185、R0110. Buried in all the Chinese official cliches is this paragraph:

"2004年，某小档功率船用燃气轮机立项研制，这是海军首型动力单独立项的燃气轮机，也是航空工业首次承担研制自主知识产权的舰船动力。李孝堂作为燃机型 号总设计师，面对研制时间短、任务急、技术难度大等困难，采用一系列先进技术，采用并行工程及项目管理方式，设计、生产、试车台改造及装配加工等各方面工 作安排合理，相关部门责任明确，高速运转。2006年12月，该燃气轮机在试验基地A205老试验台调试，标志着航空工业具有自主知识产权的动力产品将开 拓出又一全新的应用领域。之后，在新建试车台上仅用69天就完成了整机耐久性考核试验。2008年4月，该型燃机顺利通过技术鉴定，综合技术指标达到国际 先进水平，2015年初通过样机技术鉴定，现在用户已小批量订货并装船。"

Click to expand...

So this is definitely speaking specifically to the gas turbine used to power Type 726?

I translate the above as:

Translation said:

A small marine gas turbine power project profile development, which is the Navy 's first gas turbine based power project alone , but also the development of the aviation industry for the first time assume ship power independent intellectual property rights .

Li Xiaotang as gas turbine model designer, face development time is short, the task urgent, technical difficulties and other difficulties , the use of a series of advanced technology , the use of concurrent engineering and project management, design, production , testing and assembly processing station renovation all aspects of the work will be reasonable, relevant departments clear responsibility , high-speed operation .

In December 2006 , the gas turbine test site in the old A205 test stand debugging , marking the aviation industry with a power independent intellectual property products will open up another new applications. After that, the new test stand just 69 days to complete the overall durability of the assessment tests.

In April 2008 , this type of gas turbine successfully passed technical appraisal , comprehensive technical indicators have reached the international advanced level , by early 2015 prototype technical evaluation, the user now has small orders.

Click to expand...

Sounds like, if true, that it took (as you say) years to develop and overcome the difficulties, but now he has a good engine and is getting orders.

If that is so, we should definitely start seeing more Type 726s.

They have built four Type 071s and need four LCAC for each...and apparently they will be building at least two more Type 071s.