yes, I think that's reasonable. Just getting the range from 8000km to 12000km (or whatever it is) is already quite an accomplishment. Required significant weight/volume reduction elsewhere and better propellent & motor. All that new carbon fiber and quartz fiber are quite the game changer.
The DF-31 is a
40-ton class intercontinental ballistic missile (ICBM), larger than the Minuteman III (~33 tons).
The JL-2 is derived from the DF-31.
The KZ-11, a
78-ton class civilian launch vehicle, is related to the JL-3. Its first stage weighs approximately
28 tons.
Therefore, the JL-3 should be a
50-ton class solid-propellant rocket. Considering the DF-31's technology originated from the mid-to-late 1990s (China's solid propellants at the time had not yet resolved CL20/N15 high-energy formulations), whereas the JL-3 represents technological advancements circa
2010, its solid rocket motor thrust has significantly increased.
The DF-31's first stage provides
~1,200 kN thrust, while the KZ-11 achieves at least
1,800–2,200 kN (comparable to the U.S. MX missile).
PS: ICBM takeoff thrust is typically
2–3 times its own mass. Higher thrust shortens atmospheric flight time, enhancing boost-phase penetration capability (primarily against U.S. ABL and forward-deployed THAAD systems). This technology is termed
"fast-burn engine"—completing first-stage flight in
45–50 seconds, versus 60–70 seconds for conventional designs.
With fast-burn technology, the missile completes all three-stage solid-rocket boosting in
~120 seconds, whereas non-fast-burn ICBMs require
180–200 seconds.
Thus, the JL-3
increases both range and payload capacity, enabling reliable MIRV deployment.
Additionally, DF31 has a diameter of 2 meters, while KZ11 has a diameter of 2.2 meters