countryman
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Yes, numerous high performing solid propellant are available now, even have replaced traditional solid fuel in short range and in several medium range missiles. Yet most ICBMs still use same old composite for first stage and boosters. US, Russia, China use/have used both solid and liquid propellants for ICBMs where first and second stage usually use solid propellant, later stages are seen to be varying however terminal one is usually liquid. You know, it is like RPG. Despite better and more accurate alternatives, it is still widely used. Though, in my view trajectory have nothing to do with fuel rather it is determined by the target, range and characteristics of missile you're firingWell, correct me if I am wrong, but my understanding is that solid fuel technology has advanced to a stage where some modern ICBMs actually employ solid fuel technology. Currently, liquid fuel makes sense for payloads of multiple tonnes or where the trajectory is extremely high. The NK Hwasong uses liquid fuel because of its lifted trajectory.
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