Estes A8-5 Model Rocket Engines
Estes A8-5 18mm Model Rocket Engines
Estes A8-5 Model Rocket Engines wth Plugs and Ignitors
Estes A8-5 Model Rocket Engines 3 Pack
A8 Model Rocket Engine Thrust Curve Chart
Estes A8-5 Model Rocket Engines Assembly
Model Rocket Thrust Curve Example
Estes 18mm Rocket Engine Assembly How-To Video

A8-5 Engines

SKU: 010036

$12.49
Sale

The Estes A8-5 Engine offers strong peak thrust and a 5 second delay, making it perfect for lightweight rockets that benefit from longer coast times before recovery deployment. It supports launch weights up to 2.0 ounces and delivers smooth, high-altitude flights.

This standard 18 mm engine fits a wide range of Estes rockets and comes in a 3-pack with igniters and plugs. A reliable choice for students, educators, and hobbyists seeking performance and control in every launch.

Includes:
- 3 A8-5 Engines
- 4 Starters
- 4 Starter Plugs

PLEASE NOTE: You must have a physical address for delivery.

Overview

The Estes A8-5 Engine is a lightweight, high-performance motor designed for small rockets and upper-stage missions. With a maximum lift weight of 2.0 ounces and a peak thrust of 10.7 newtons, it delivers strong, stable acceleration for reliable flights. The -5 second delay is optimized for rockets that benefit from a longer coast phase before deploying their recovery systems, enabling smooth altitude transitions and gentle descents.

Ideal for both single-stage and multi-stage builds, the A8-5's longer delay allows your rocket to arc and slow after burnout before activating the ejection charge. This helps protect the recovery system and contributes to a more controlled return. Its compatibility with a wide range of Estes kits makes it a flexible and dependable option for hobbyists, educators, and students alike.

This standard 18 mm engine is easy to install and works seamlessly with many lightweight Estes rockets. Each pack includes three A8-5 engines, four igniters, and four igniter plugs—everything needed to get your launch sequence ready in just minutes.

Whether you're building for a classroom lesson, a club launch, or weekend backyard flights, the Estes A8-5 Engine offers the performance and precision needed for successful missions. Count on it to deliver smooth launches, high-altitude arcs, and reliable recoveries every time.

ATTENTION: Residents of California, New Jersey, Rhode Island and North Dakota please review the Terms of Sale for state specific restrictions or Click Here for State Specific Restrictions.

Overview

Estes A8-5 Model Rocket Engines wth Plugs and Ignitors

Compatible Rockets

Technical Specifications

Technical Specifications

  • Total Impulse

2.50 N-sec
  • Time Delay

5 Seconds
  • Max Lift Weight

2.0 oz (57 g)
  • Max Thrust

10.70 Newtons (2.4 lbs)
  • Thrust Duration

0.80 Seconds
  • Length

2.8 in. (7 cm)
  • Diameter

18 mm
  • Weight

.55 oz. (15.6 g)
  • Propellant Weight

0.14 oz (4.1 g)
A8 Model Rocket Engine Thrust Curve Chart

Customer Reviews

Based on 3 reviews
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A
Alex
A8-5

Worked well, but delay was a little long. Parachute snapped on 2nd flight

P
Peter Wetzel
Perfect Smaller Space Load

These were a better choice for our space than the B6-4 we got also. Our first rocket launched into the stratosphere and got caught by a guest of wind. We used these smaller engines for two other rockets and they stated within range and were also visible full flight.

J
Jerry Irvine
I am a strong believer in A8-5 motors. Most rockets

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.