A3-4T Rocket Engines

The Estes A3-4T is a mini single-stage engine built for rockets up to 2.0 ounces—ideal for hobby and specialty retail. With a peak thrust of 6.80 newtons and a 4-second delay, it delivers consistent performance for lightweight rocket flights. Each retail pack includes four engines, four starters, and four starter plugs—offering a convenient, all-in-one engine option for customers seeking dependable Estes quality. Includes: - 4 A3-4T Engines - 4 Starters - 4 Starter Plugs