Pentagon leak may not be any more valuable than our famous "彩云湘江". It probably worked like this, some Pentagon guy surfed social media, read some post made by somebody who claimed working in the navy yard, the Pentagon guy wrote a report labeled as classified, then somebody leaked it. Internet has made leaking easier, but also made rubish and delibrate miss-information easier, the end result is probally that everything is less reliable.
00X/004 future nuclear CATOBAR carrier thread
- Thread starter AETHER
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Can someone explain the 238 ton maximum load capacity ?
It seems VERY excessive or they adding safety factors already at this stage ?
I know human rated elevators can have safety factors of 11 and similar but if you want a 1000 kg elevator that is what you specify, not 11000 kg. It would be up to the engineering firm to design it with the minimum legal safety factor and make sure it follows all regulations.
It seems VERY excessive or they adding safety factors already at this stage ?
I know human rated elevators can have safety factors of 11 and similar but if you want a 1000 kg elevator that is what you specify, not 11000 kg. It would be up to the engineering firm to design it with the minimum legal safety factor and make sure it follows all regulations.
What do you mean by this photo? The dock is real in Dalian, but the CV in the dock is clearly US Ford class phtoshoped into it.
My understanding is that drydock is where the next carrier is expected to be built, and the Ford is overlaid in for a sense of scale given the future PLA CVN is likely to have similar dimensions and proportions.
238t isn't the capacity of the lift. There are two parts of the bid.
22K2777-2944-01: 平台本体轻量化方案研究 Research in weight reduction of platform
3.1工作目标 Objective:
为实现升降机的转运需求，进行平台本体的结构优化设计和计算仿真，完成平台轻量化研究工作。
In order to meet operational requirement of the lift, conduct optimization and simulation of platform design, to complete weight reduction study.
22K2777-2944-02: 模拟提升系统试验能力分析 Analysis of test capability of simulated lift system
3.1 工作目标 Objective:
本项目的工作目标是针对上海试验室模拟提升系统的试验承载能力进行评估分析。主要工作包括（1）按照载荷输入计算现有地下建筑及地上建筑（全套模拟提升系统）的结构强度（2）根据计算结果和现场探伤结果对模拟提升系统试验承载能力进行评估分析。
The objective is to assessment of the load capability of the simulation system in Shanghai lab.
3.3 技术指标 Technical requirement
1）最大承载能力：238t；Maximum load capability: 238t
Apparently, the 238t is NOT the capability of the lift itself, but some kind of capability of the test rig or simulation system. If we compare with the rocket engine test, it is like YF-100 (max 130t) engine being tested on the 500t test rig which is the counterpart of 238t.
I see.
One extra cat on a larger CV is easy and doable, but the benefit isn't obvious though according to this paper.
The conclusion was that 2 CAT is enough to conduct operation intensity as CVN Nimitz did in 1997's high tension excersize. So 2 is the minimum of CV in such class, while 3 is enough after calculating in redundancy and battle demage. Of course the calculation is based on how reliable the CAT is, the lesser the more needed, 3 is based on PLAN's confidence in their EM CAT.
This paper isn't to say that PLAN reject 4 cat, but it is saying that PLAN sees 4 CAT is more than necessary based on the reliability of their EM CAT and their operational demand. If I am to be light hearted, I'd say Ford need 6 EM CATs to do the job of 4 steam CATs on Nimitz.
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Yes, I also read on multiple places that the 4th catapult is not used commonly. When Nimitz was first conceptualized USN was after simultaneous recovery and launches, and 90+ aircraft air wings. So 4 elevators and 4 catapults. Both didn't happen.
To clarify, the USN having four catapults on a single carrier preceded the Nimitz class by a long time.
It began with the Forrestal class in the 1950s, and has been the standard for USN carriers since then.
In real combat, the impact of an aircraft carrier being attacked must be considered. Under high-intensity attacks, 4 catapults are significantly superior to 2-3 catapults.
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