If you plan to work in aerospace: Yes. If you are a hobbyist: Yes, used. If you are just curious: Borrow it from a library, but be prepared to buy your own copy after Chapter 3.
A deep dive into the classic text that bridges the gap between theory and the thrust equation. rocket propulsion elements 10th edition
5/5 solid propellant grains. Call to action: Do you have a well-worn copy of Sutton? Drop a comment below with your favorite chapter or a story about when this book saved your design. If you plan to work in aerospace: Yes