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ENGINES FOR MODEL ROCKETS 3 – B4-2 Engines 4 – Starters 4 – Starter Plugs Overview The Estes B4-2 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 4 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs.
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