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Hello Greenwichmain,
Depends on what you define as a "rocket." As for the rocket itself, there are plenty (SLS, Ariane 6, Long March rockets, etc.). These usually use liquid propellant for both their main and upper stages, while the side-mounted boosters are solid-propellant. I'm not aware of both in a single combustion system—at least not currently.
I hope I was able to help you!
Kind regards
Jein. Das Konzept ist schon alt und wurde auch bereits erprobt.
https://de.wikipedia.org/wiki/Hybridrakete
Ob es in der Praxis, also in Serienraketen oder in der Raumfahrt, allerdings schon angewandt wurde, ist mir nicht bekannt, glaube eher nicht.
Anscheinend ist man aber zumindest kurz davor:
https://www.dlr.de/de/aktuelles/nachrichten/2021/03/20210719_hybridraketentriebwerk-viserion-erfolgreich-getestet
Jein. Es gibt Raketen, in denen sich beide Arten von Treibstoff befinden. Halt nur an anderen Stellen für verschiedene Aufgaben.
da beide antriebe total unterschiedlich arbeiten (flüssig mit einspritzen in eine brennkammer – fest mit irreversiblem abbrennen über einen hohlraum) kann man sie nur parallel benutzen, was bereits schon bei den space-shuttles erfolgte, die neben den beiden boostern (feststoff) noch einen zusatztank (flüssig) beim start hatten.