EST1504 1/2A3-4T Engines

Single-use solid propellant rocket engines sized for 13 mm mini mounts and engineered to deliver a dependable boost for very lightweight model airframes. Designed for predictable ignition and a defined thrust profile followed by a timed delay before recovery activation to ensure consistent flight and retrieval in beginner and educational flights. Ideal for small rockets targeting quick, low-altitude missions.

• Sized to 13 mm diameter for secure fit in mini class engine mounts and lightweight kits.

• Total impulse calibrated near 1.25 N-sec for appropriate lift with minimal structural stress.

• Peak thrust around 8.3 N concentrated in a short burn for reliable lift-off.

• Built-in 4 s delay before ejection charge allows controlled coast to apogee.

• Compact length and low mass reduce influence on rocket stability and tracking.

• Includes ignition starters and plugs sized for secure electrical contact and firing.

• Consistent construction and propellant grain quality help repeatable performance across launches.