Estes 1/2A3-4T Model Rocket Engines

The Estes 1/2A3-4T mini (13 mm) engine is an upper stage type of engine (purple label) that is used for flying a model rocket. This engine can also be used as a single stage engine in lightweight rockets. Each engine size is designated by a letter and is up to twice as powerful as the letter before it.

Safe, intelligent design, precise manufacture and strict engineering tolerances have made Estes model rocket engines the standard in the industry. Estes model rocket engines have been proven consistent and reliable in more than 300,000,000 launches. All Estes engines comply with the codes of the National Fire Protection Association and are certified by the National Association of Rocketry.

1/2A3-4T Engine Specifications:

• Type: Upper Stage
• Length: 1.75"
• Diameter: 0.5" (13 mm)
• Total Impulse: 1.25 N-sec
• Delay Time: 2 seconds
• Max. Lift Weight: 2.0 oz

Includes:  4 - engines, 4 - starters and 4 - starter plugs.

Note:  Estes model rocketry is recommended for ages 10 years and up. Adult supervision is recommended for those under 12 years of age. Must be at least 14 years of age to purchase in California or New Jersey, 16 in Rhode Island and 10 in North Dakota.