Estes Model Rocket Engine B4-4 Standard Engine (3)

The Estes B4-4 is a versatile and well-balanced model rocket engine that delivers moderate thrust with a 4-second delay, making it ideal for a wide range of mid-sized rockets. Known for its smooth, stable flight performance and reliable ejection timing, the B4-4 is a favorite among hobbyists looking for controlled, consistent launches.

• Total Impulse: 5.0 N-sec (Class B Engine)

• Thrust Duration: 0.9 seconds

• Delay Time: 4.0 seconds

• Maximum Lift Weight: Approximately 113 grams (4.0 oz)

• Best For: Mid-sized rockets with parachute recovery systems

• Recovery Delay: Moderate delay suited for rockets that require time to coast before deployment

Each B4-4 engine pack includes:

• 3 B4-4 engines

• 4 igniters

• 4 igniter plugs

• Recovery wadding

Use Recommendations: Perfect for intermediate-level launches where altitude and recovery timing are critical. Always use with rockets rated for B-class engines and follow NAR Safety Code and local launch guidelines.