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1/4A-Class Model Rocket Engine
An 1/4A-class model rocket engine is a single-use engine designed to launch a mini model rocket. 1/4A-class rocket engines typically have the following properties:
- Total Impulse of .31-0.625 Newton-seconds
- Length of 2 3/4"
- Diameter of 1/2" (to fit inside a BT-5 rocket, or engine mount kit) (exceptions are the mini-engines)
