1/4A3-3T Engine


Can only be shipped via Standard shipping. If you ordered other items on the same order, these may be shipped separately.





The Estes 1/4A3-3T engine is single stage engine designed for model rocket flight. This engine is a mini engine designed for flights in lightweight rockets. Each package includes 4 engines, 4 starters and 4 starter plugs.



  • Total Impulse    0.625 N-sec
  • Time Delay    3 Seconds
  • Max Lift Weight    1.0 oz (28 g)
  • Max Thrust    4.90 Newtons (1.1 lbs)
  • Thrust Duration    0.25 Seconds
  • Length    1.75 in. (4.4 cm)
  • Diameter    13 mm
  • Weight    .21 oz (6 g)
  • Propellant Weight    0.05 oz (1.3 g)



  • 4 – 1/4A3-3T Engines
  • 4 – Starters
  • 4 – Starter Plugs

Used with permission, copyright ©2024 Estes Rockets. Copyright ©2024 Brey Corp. t/a Hobby Works.®


ATTENTION: Model rocketry is a legally permitted activity in every state in the U.S. However, four states have laws and regulations that specify certain age or permit requirements. Residents of California, New Jersey, Rhode Island and North Dakota please go here for state specific restrictions

Estes products may contain chemicals including silica, known to the State of California to cause cancer, birth defects or other reproductive harm. See Proposition 65 warning below.



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