The Estes 1/2A3-4T Engine Pack is designed for lightweight mini-engine model rockets weighing up to 1.0 ounce at liftoff. Each single-stage engine delivers a total impulse of 1.25 N-sec, a maximum thrust of 8.30 Newtons, and a 0.30-second thrust duration for quick, dependable flights in smaller rocket models.
A 4-second delay allows the rocket to coast after powered flight before activating the recovery system. The compact 13 mm engine measures approximately 1.8 inches long and weighs 0.23 ounce, making it suitable for compatible mini-engine-powered model rockets used for recreational flying, educational projects, and flight testing.
Each package includes four 1/2A3-4T engines, four starters, and four starter plugs, providing the essential engine components for four launches. The engines are precision manufactured for consistent ignition and predictable performance from launch through recovery deployment.
Each engine has a maximum lift weight of 1.0 ounce or 28 grams and contains approximately 0.07 ounce or 1.9 grams of propellant. Maximum thrust is 8.30 Newtons or approximately 1.9 pounds.
Purchasers and users of Estes model rocket engines are responsible for following all applicable local, state, and federal laws, regulations, and safety standards. Model rocket engines should always be handled, stored, and used according to the manufacturer's instructions and established model rocketry safety practices.
