A8-5 Engines

(3 customer reviews)

A8-5 Engines

(3 customer reviews)


3 – A8-5 Engines
4 – Starters
4 – Starter Plugs

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Availability: In stock


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The Estes A8-5 engine is an upper stage stage engine designed for model rocket flight. This engine can also be used as a single stage engine in rockets weighing less than 5 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs.

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2.8 in. (7 cm)


18 mm

Estimated Weight

.55 oz. (15.6 g)

Total Impulse

2.50 N-sec

Time Delay

5 Seconds

Estimated Max Lift Weight

2.0 oz (57 g)

Max Thrust

13.30 Newtons (3.0 lbs)

Thrust Duration

0.50 Seconds

Initial Weight

0.55 oz (15.7 g)

Propellant Weight

0.14 oz (4.1 g)

Quantity Per Pack


3 reviews for A8-5 Engines

  1. Jerry Irvine

    I am a strong believer in A8-5 motors. Most rockets actually can use the longer coast time anyway. If you know how to piston launch rockets you are always looking for a longer delay. When I do group programs of 100+ motors I always use rockets well suited to A8-5 and B6-6. The smaller fields and the ability to recover and refly your rocket easily makes lower power, longer delay motors optimal.When I do group programs each user flies at least 2 flights, and on average closer to 4. Estes is uniquely positioned to serve this market.

  2. Sarah (verified owner)

    Used in place of A8-3

    I used this in place of the A8-3 because my local hobby store sells out of engines quickly. I launched the Sky Writer using an A8-5 on a windless day and I caught it without leaving my chair!

  3. David

    A impulse for light models

    I’ve used this in place of the A8-3 in very light models. Sometimes the 3 second delay isn’t enough and the chute comes out while its still ascending. Even though its classed as an “upper stage” engine, if your model is very light or has great aerodynamic properties that can take advantage of a long coast, give this motor a try.

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