The Estes B4-2 is a solid-propellant, single-stage model rocket engine designed for medium-weight rockets that need a short delay before recovery system deployment. With a 2-second delay, the B4-2 is ideal for rockets that reach apogee quickly and need prompt parachute or streamer deployment.
- Total Impulse: 5.0 N-sec (Class B Engine)
- Thrust Duration: 0.9 seconds
- Delay Time: 2.0 seconds
- Maximum Lift Weight: Approximately 113 grams (4.0 oz)
- Optimal for: Mid-sized rockets that reach apogee quickly and require fast recovery deployment
- Recovery Delay: Short delay suited for rockets with rapid altitude gain
Each B4-2 engine pack includes:
- 3 B4-2 engines
- 4 igniters
- 4 igniter plugs
- Recovery wadding
Recommended Use: For use in rockets designed for B-class engines where a short coast phase is needed. Ensure safe launch practices by following the NAR Safety Code and local regulations.