1/4A3-3T Engine

1/4A3-3T Engine


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

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$11.29 $9.03

Availability: In stock


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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.

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1.75 in. (4.4 cm)


13 mm

Estimated Weight

.21 oz. (6 g)

Total Impulse

0.625 N-sec

Time Delay

3 Seconds

Estimated Max Lift Weight

1.0 oz (28 g)

Max Thrust

4.90 Newtons (1.1 lbs)

Thrust Duration

0.25 Seconds

Initial Weight

0.21 oz (5.9 g)

Propellant Weight

0.05 oz (1.3 g)

Quantity Per Pack


7 reviews for 1/4A3-3T Engine

  1. Brandon

    Great for Small Fields

    This is a good engine for an introduction to Rocketry. They are cheap and can help keep your rockets in the area of a small field or playground. It’s perfect in an Estes Mosquito.

  2. Shane

    Perfect test engine

    I personally use this engine to test the stability of my mini-engine rockets. Combine this engine with the 220 Swift and you have just about the most reliable and least expensive motor/rocket combination available. Thumbs up for sure!

  3. David

    Great little engine

    Used it in a small park in the City and had no issues.

  4. Juliet

    Tiny engines for mini rockets

    These are tiny little engines that come in packs of four and only work for mini rocket kits. These engines can still cause rockets to fly very high- it just depends on the size and design of the rocket.

  5. dave


    estes has very reliable engines. A+ rating

  6. banshee89

    Great starter engine

    I have been flying Estes rockets off and on for about 20 years. I saw these in my local shop and decided to give them a try and purchased the summit rocket at the same time. I have a wide old airport type area so room wasn’t a problem and we were flying it along with other larger models. I would say it went about 100′ to 150′ . That altitude would be great for a large playground with no wind. I higly recommend this size for a first kit.

  7. David

    Great Playground Engine

    So you have the itch to fly but its windy or you have a REALLY small space? No problem! Put one of these in your mini engine rocket and you’re ready to roll! I tried one of these engines in my Firehawk (yes, that kit gets a lot of use! Its a great “engine testing” rocket!) and for a 1/4A I really liked the flight! If you swapped the ‘chute for a streamer you could probably fly this kit with this engine in a suburban backyard! For small kits in cramped spaces I recommend it.

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