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For 7.2” chemical rocket CIT Model 15 (primarily) and for 5.0” aircraft rocket (secondarily). About 2.3” (without burster tube). Steel and brass. There are two models. The original model has a fixed propeller guard; Model 1 has a removable cap (shipping guard) over the propeller. 2,500 of each type were manufactured by Caltech for the Army Chemical Warfare Service for tests. Model 1 was adopted for standardization. “A”: original; “B”: cutaway. No Date