Estes Rocket Engine: B4-4

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ENGINES FOR MODEL ROCKETS 3 – B4-4 Engines4 – Starters4 – Plugs The Estes B4-4 engine is single stage engine designed for model rocket flight. This engine is a standard engine desi gned for flights in rockets weighing less than 3.5 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs. Show more