1/2A3-4T Engines

1/2A3-4T Engines


4 – 1/2A3-4T Engines
4 – Starters
4 – Starter Plugs

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Availability: In stock


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The Estes 1/2A3-4T 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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1.8 in. (4.6 cm)


13 mm

Estimated Weight

.23 oz. (6.5 g)

Total Impulse

1.25 N-sec

Time Delay

4 Seconds

Estimated Max Lift Weight

1.0 oz (28 g)

Max Thrust

8.30 Newtons (1.9 lbs)

Thrust Duration

0.30 Seconds

Initial Weight

0.23 oz (6.6 g)

Propellant Weight

0.07 oz (1.9 g)

Quantity Per Pack


2 reviews for 1/2A3-4T Engines

  1. Caley


    For the Bandito rocket

  2. David

    The Mini Engine That Can Do It All

    I’ve flown this engine in my Summit and Firehawk kits, and have seen it flown in a few other kits in the Estes lineup. I really like the versatility of this engine. I wrote a review of the B6-4 as being the “Swiss Army Knife of the Estes lineup”. To me, this engine is the mini engine counterpart to the B6-4. I always keep a couple packs on hand just in case an impromptu launch strikes my fancy.

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