Estes Rocket Motors - B4-4 (Pack3)

The Estes B4-4 engine is a single-stage, standard 18 mm motor for model rocket flight. Suitable for rockets weighing less than 3.5 oz (99 g) including the engine, this Estes Rocket Motors - B4-4 (Pack3) set offers reliable boost with a 4-second delay for ejection. Pack D-ES1602 includes three motors plus starters and plugs to support consistent launches.

What’s Included

• 3 x B4-4 rocket motors
• 4 x starters
• 4 x plugs

Key Specifications

• Diameter: 18 mm
• Length: 2.8 in (7 cm)
• Total Impulse: 5.00 N-sec
• Time Delay: 4 seconds
• Thrust Duration: 1.10 seconds
• Max Thrust: 13.20 N (3.0 lbs)
• Estimated Max Lift Weight: 3.5 oz (99 g)
• Estimated Weight: 0.68 oz (19.3 g)
• Initial Weight: 0.68 oz (19.2 g)
• Propellant Weight: 0.27 oz (7.6 g)
• Quantity Per Pack: 3