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The Estes 1/2A3-2T engine is single stage engine designed for model rocket flight.
Hooks fit mini engines (two), regular and ‘D’ engines (three) and ‘E’ engines (two).
The Estes 1/4A3-3T engine is single stage engine designed for model rocket flight.
The Estes A10-3T engine is single stage engine designed for model rocket flight.
The Estes 1/2A3-4T engine is single stage engine designed for model rocket flight.
The Estes B4-2 engine is single stage engine designed for model rocket flight.