Estes B6-4 Engines – Balanced Power for Mid-Size Rockets
The Estes B6-4 engine is a versatile option for standard model rockets, offering a balance of thrust and delay for smooth, controlled flights. Designed for rockets up to 4.0 oz, it provides reliable performance with a 4-second delay for proper recovery system deployment.
Key Features
- Standard 18 mm engine size compatible with many Estes rockets
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4-second delay for controlled parachute deployment
- Designed for rockets up to 4.0 oz
- Balanced thrust for mid-altitude flights
- Consistent and reliable performance

What’s Included
- 3 × B6-4 rocket engines
- 4 × starters
- 4 × starter plugs

Specifications
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Engine Type: B6-4
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Size: 18 mm
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Delay Time: 4 seconds
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Recommended Rocket Weight: Up to 4.0 oz
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Total Impulse: ~5.0 N-sec
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Max Thrust: ~12.1 N
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Thrust Duration: ~0.8 seconds
Applications
- Model rocket launches
- STEM and educational projects
- Mid-size rocket flights
- Hobby and recreational use
Compatible Rockets
- Rascal™ & HiJinks™ Launch Set
- Hi-Flier®
- Tandem-X™ Launch Set
- Alpha III®
Important Notes
- Physical address required for delivery
- Use only with compatible rockets and launch systems
- Follow all applicable safety guidelines