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Old 12-01-2017, 06:02 PM
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Royatl Royatl is offline
SPEV/Orion wrangler
Join Date: Mar 2005
Location: Atlanta, GA
Posts: 2,181

I just measured the core depth of a 1975 Estes B14 and a 1990 B8 and found them to be within a hundreth of an inch of each other (0.68" from the casing edge, not the nozzle exit, though they appeared to be the same). The throat diameter of the B14 was 0.17" vs the B8's 0.145", so they were already de-tuning the B14 at that time.
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