B4-2 Engines
B6-2 Engine Single
B4 Thrustcurve
B4-2 Engines

B4-2 Engines



3 – B4-2 Engines
4 – Starters
4 – Starter Plugs

PLEASE NOTE: This item will ship by US Postal Service only. You MUST HAVE a physical mailbox or post office box for delivery.


The Estes B4-2 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 4 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs.

ATTENTION: Residents of California, New Jersey, Rhode Island and North Dakota please review the Terms of Sale for state specific restrictions or Click Here for State Specific Restrictions.


Technical Specifications

Technical Specifications

  • Total Impulse

5.00 N-sec
  • Time Delay

2 Seconds
  • Max Lift Weight

4.0 oz (113 g)
  • Max Thrust

13.20 Newtons (3.0 lbs)
  • Thrust Duration

1.10 Seconds
  • Length

2.8 in. (7 cm)
  • Diameter

18 mm
  • Weight

.66 oz. (18.7 g)
  • Propellant Weight

0.27 oz (7.6 g)
  • Having Trouble?

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