A3-4T Model Rocket Engines (4)

This is an A-class A3-4T single use mini model rocket engine from Estes. For use in single stage model rockets.

Estes A3-4T Model Rocket Engines (4) Mini Rocket Motor #1507
 Estes Rockets # est1507
Retail $12.11  SAVE 21% !
Estes Rockets Item # est1507
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Spotlight Review

"Rocket motors"
We used these motors with our ranger outpost, they worked great.

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  • Length: 1 3/4"
  • Diameter: 1/2"
  • Estes Product Number: 1507


  • 4 A3-4T Model Rocket Engines
  • 4 Igniters
  • 4 Plugs

Requirements & Suggestions

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"Nice, Slow Liftoff"
FinBurner (Brandonbacn@outlook.com)
I prefer these over A10s because they make for nice, slow lift-offs. These are very economical (4 per pack). We use them quite a bit to launch a mini Honest John and mini Der Red Max in our local park. I've never experienced a failure with more than 20+ launches.

"A3-4T 'Mini' Rocket Motor, Great little motor for light weight rockets"
Have been using these A3-4T 'Mini' series rocket motors, for decades without any complaints, for small, light weight rockets. Wish Estes would bring back the Upper Stage release for this impulse class rocket motor A3-6T, it doesn't seem logical, now that it's discontinued. 'Mini' Booster, 'Mini' Single Stage, but no real 'Mini' Upper Stage, with a long delay, that way mini rockets can reach apogee without damaging their recovery systems.

Works most of the time. I have had a few of these CATO in the past. They are very fragile and tend to CATO if dropped before flying.


  • WARNING: Model rocket motors are flammable. Please use caution.
  • Must be 14 to purchase in CA and NJ.
  • Do not burn engines.
  • Soak in water to destroy.

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