The Type 094 submarine is capable of carrying 12 of the more modern JL-2s[5] with a range of approximately 14,000 km, and is capable of targeting all of the Western Hemisphere, from close to the Chinese coast. /QUOTE]
I thought JL-2 only has a range of 8000 km. Not even American SLBM has that range (Trident II - 11000-12000 km). Only land based ones.
Estimated range of 14,000 km for the JL-2 is at the upper range of estimates, but it is still close to the 12,000 km range for the Trident II. The extra 2,000 km may be explained by a slightly bigger JL-2 missile or arming the missile with a smaller warhead to reduce the weight.
A third possible explanation is that, since the JL-2 was built 16 years after the Trident II, the JL-2 may have been designed with improved lightweight (e.g. composite) materials and/or been lavished with a lot more supercomputer time on its design.
A fourth possible explanation is that the JL-2 has only two stages, instead of the three stages for the Trident II. "Such design simplifies the structure of the missile and largely reduces missile's overall weight by reducing one stage." (See newslink below)
I selected Wikipedia as a source because I wanted to quote that two Type 094 submarines have been "confirmed to be launched" and the "United States government has expressed concern over these submarines, saying that the Chinese government has not been transparent enough about the program." Feel free to adjust the JL-2 range downward to "11000-12000 km" to match the Trident II's range.
http://en.wikipedia.org/wiki/JL-2
"In late 1980s and 1990s, an academician of the Chinese Academy of Engineering named Wang Zhenhua (王振华
proposed a new theory typically for the JL-2 SLBM, called "
(Free) Relaxation into Trajectory" (自由入轨
.
Based on this theory, JL-2 only needs two stages to achieve its intercontinental status instead of three. Conventionally, any type of ICBMs has three phases to finish its flight: (i) the boost phase, (ii) the mid-course phase, and (iii) the terminal phase.
Wang's idea is to combine the first and the second phases into one, the passive-boost phase (助推段
. Plus the final atmospheric reentry phase, therefore, in total the JL-2's trajectory only has two phases and two stages.
The first phase is based on the first solid-fueled rocket engine (first stage). The first stage passively launches the missile out of the atmosphere, and accelerates it into a speed in between the first (7.9 km/s) and second (11.2 km/s) escape velocities.
When the missile is in this transition state, the first stage booster sheds off, and the missile automatically adapts its "free" trajectory and further reaches its maximium altitude (without a constant velocity); the dominating force here is just the earth's gravity. The second stage engine (liquid-fueled) then starts working.
Normally, SLBM has three stages.
Such design simplifies the structure of the missile and largely reduces missile's overall weight by reducing one stage. Additionally, it
increases the atmospheric reentry velocity, which
leads to more difficult interception, such as, by the NMD."