Elon Musk @elonmusk
@Peter_J_Beck @torybruno @Starlinksat223 @Erdayastronaut Yeah. Merlin, using a single pintle injector with cold, liquid propellant, needs a longer chamber than Raptor, which uses a large number of coaxial injectors, despite Merlin being less than half thrust. Propellant enters Raptor chamber as hot gas that’s already mixed. — PolitiTweet.org