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 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 Engine Type: B6-4 Size: 18 mm Delay Time: 4 seconds Recommended Rocket Weight: Up to 4.0 oz Total Impulse: ~5.0 N-sec Max Thrust: ~12.1 N 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
