If you use the current Estes thin wall casings (I.D. 0.500"), it is about 1½" from the front of the casing to the front of the clay cap over the ejection charge. Estes did offer A5-0S, A5-2S, and A5-4S motors in the 1970, 1971 (both editions), and 1972 catalogs.

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'Til next time,

Mike Toelle

NAR 31692 L1

SAM 0373